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Tanaka N, Ikemoto F, Yamada I, Shimabukuro Y, Kisaki M, Diño WA, Sasao M, Wada M, Yamaoka H. Positive and negative hydrogen ion reflections of low-energy atomic and molecular hydrogen ion beam from HOPG and Mo surfaces. Rev Sci Instrum 2020; 91:013313. [PMID: 32012640 DOI: 10.1063/1.5129576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 12/19/2019] [Indexed: 06/10/2023]
Abstract
Positive and negative hydrogen ion reflections from surfaces by injecting singly charged hydrogen ion beams show a clear difference between atomic and molecular ion injections at low energy and grazing incidence. The intensity ratio of reflected negative to positive ions H-/H+ increased as the incident beam energy per nucleon decreased only when molecular ion beams are injected. It implies that negative ions are more produced upon beam-surface interaction when molecules are injected. A possible reason was discussed in terms of difference in the negative ion production processes between atomic and molecular ions.
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Affiliation(s)
- Nozomi Tanaka
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - Fumiya Ikemoto
- Graduate School of Science and Engineering, Doshisha University, Kyoto 610-0321, Japan
| | - Ippei Yamada
- Graduate School of Science and Engineering, Doshisha University, Kyoto 610-0321, Japan
| | - Yuji Shimabukuro
- Graduate School of Science and Engineering, Doshisha University, Kyoto 610-0321, Japan
| | - Masashi Kisaki
- National Institute for Fusion Science, Gifu 509-5292, Japan
| | | | - Mamiko Sasao
- Institute for R&D Promotion, Doshisha University, Kyoto 602-8580, Japan
| | - Motoi Wada
- Graduate School of Science and Engineering, Doshisha University, Kyoto 610-0321, Japan
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2
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Matsumoto Y, Kisaki M, Shinto K, Nakano H, Sasao M, Wada M. Development of a low energy small electron gun to study electron transport in hydrogen negative ion source plasmas. Rev Sci Instrum 2020; 91:013333. [PMID: 32012561 DOI: 10.1063/1.5128609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 01/06/2020] [Indexed: 06/10/2023]
Abstract
We developed a small-size electron gun capable of producing electrons with kinetic energy less than few tens of eV to investigate the slowing down and transport mechanisms of electrons in hydrogen negative ion source plasmas. The maximum extractable beam current density reached 36 μA/cm2 for 1 eV beam energy in a preliminary experiment. Although the present electron current density is still insufficient compared with our target value, 1 mA/cm2, we have found some hints to realize larger beam current density from the electron gun through this study. The measured beam profile along the electron beam axis has shown that the electron beam could travel approximately 7 mm from the electron gun in vacuum. The Particle-In-Cell (PIC) simulation explained the measured beam profile well and indicated that the electron beam has an energy spread as small as 0.1 eV compared to the 1 eV mean energy. The PIC simulation showed a discrepancy from the measurement in the dependence of the electron beam current on the beam extraction voltage of the electron gun. It implies that we should introduce a more realistic filament structure inside the electron gun in the PIC simulation in order to study the transport of low energy electrons more precisely.
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Affiliation(s)
| | - Masashi Kisaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Katsuhiro Shinto
- Japan Atomic Energy Agency, J-PARC Center, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
| | - Haruhisa Nakano
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - Mamiko Sasao
- Doshisha University, Kyotanabe, Kyoto 610-0394, Japan
| | - Motoi Wada
- Doshisha University, Kyotanabe, Kyoto 610-0394, Japan
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3
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Eguchi T, Sasao M, Shimabukuro Y, Ikemoto F, Kisaki M, Nakano H, Tsumori K, Wada M. A compact electron cyclotron resonance negative hydrogen ion source for evaluation of plasma electrode materials. Rev Sci Instrum 2020; 91:013508. [PMID: 32012543 DOI: 10.1063/1.5128610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 12/18/2019] [Indexed: 06/10/2023]
Abstract
A compact ion source that produces hydrogen plasma with an electron cyclotron resonance (ECR) configuration combined with a 2-stage extraction system with a single aperture of 6 mm diameter has been designed and built to study the performance of different materials as the plasma electrode (PE) of a negative hydrogen ion source. The source has the capability to electrically bias the PE with respect to the ECR plasma. The first experiment with low ECR power input (less than 40 W) was carried out. The PE of the C12A7 electride showed the largest H- current among aluminum, molybdenum, and the C12A7 electride.
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Affiliation(s)
- Takayuki Eguchi
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Mamiko Sasao
- Office of R&D Promotion, Doshisha University, Kamigyoku, Kyoto 602-8580, Japan
| | - Yuji Shimabukuro
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Fumiya Ikemoto
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Masashi Kisaki
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - Haruhisa Nakano
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - Katsuyoshi Tsumori
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - Motoi Wada
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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4
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Wada M, Shinto K, Shibata T, Sasao M. Measurement of a time dependent spatial beam profile of an RF-driven H - ion source. Rev Sci Instrum 2020; 91:013330. [PMID: 32012539 DOI: 10.1063/1.5128015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
The AC component of a beam current extracted from a negative hydrogen (H-) ion source was detected through a 0.1 mm wide, 66.5 mm long entrance slit to observe the spatial distribution. An internal antenna type multicusp source driven by a 2 MHz radio frequency (RF) power delivered beams to an electrostatic accelerator coupled to a pair of magnetic lenses. The local beam intensity measured by a Faraday cup after the entrance slit exhibited an oscillation showing two main frequency components: the RF power supply frequency and the frequency two times the driving RF. The frequency spectrum of the detected signal showed sharp peaks at 2 MHz, 4 MHz, and 6 MHz as well as at 3 MHz and 5 MHz. A 1 mm displacement of the Faraday cup slit position from the center of the beam axis increased the oscillation amplitude, corresponding to a larger amplitude of the AC component at the beam edge.
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Affiliation(s)
- M Wada
- School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - K Shinto
- J-PARC Center, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
| | - T Shibata
- J-PARC Center, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
| | - M Sasao
- Organization for Research Initiatives and Development, Doshisha University, Kamigyoku, Kyoto 602-8580, Japan
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5
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Hawryluk R, Barnes CW, Batha S, Beer M, Bell M, Bell R, Berk H, Bitter M, Bretz N, Budny R, Bush C, Cauffman S, Chang CS, Chang Z, Cheng C, Darrow D, Dendy R, Dorland W, Dudek L, Duong H, Durst R, Efthimion P, Evenson H, Fisch N, Fisher R, Fonck R, Forrest C, Fredrickson E, Fu G, Furth H, Gorelenkov N, Grek B, Grisham L, Hammett G, Heidbrink W, Herrmann H, Herrmann M, Hill K, Hooper B, Hosea J, Houlberg W, Hughes M, Jassby D, Jobes F, Johnson D, Kaita R, Kamperschroer J, Kesner J, Krazilniknov A, Kugel H, Kumar A, LaMarche P, LeBlanc B, Levine J, Levinton F, Lin Z, Machuzak J, Majeski R, Mansfield D, Mazzucato E, Mauel M, McChesney J, McGuire K, McKee G, Meade D, Medley S, Mikkelsen D, Mimov S, Mueller D, Navratil G, Nazikian R, Nevins B, Okabayashi M, Osakabe M, Owens D, Park H, Park W, Paul S, Petrov M, Phillips C, Phillips M, Phillips P, Ramsey A, Redi M, Rewoldt G, Rice B, Rogers J, Roquemore A, Ruskov E, Sabbagh S, Sasao M, Schilling G, Schmidt G, Scott S, Semenov I, Skinner C, Spong D, Strachan J, Strait E, Stratton B, Synakowski E, Takahashi H, Tang W, Taylor G, Goeler SV, Halle AV, White R, Williams M, Wilson J, Wong K, Wurden G, Young K, Zarnstorff M, Zweben S. Review of D-T Results from TFTR. ACTA ACUST UNITED AC 2018. [DOI: 10.13182/fst96-a11963011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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6
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Komori A, Morisaki T, Mutoh T, Sakakibara S, Takeiri Y, Kumazawa R, Kubo S, Ida K, Morita S, Narihara K, Shimozuma T, Tanaka K, Watanabe KY, Yamada H, Yoshinuma M, Akiyama T, Ashikawa N, Emoto M, Funaba H, Goto M, Ido T, Ikeda K, Inagaki S, Isobe M, Igami H, Itoh K, Kaneko O, Kawahata K, Kobuchi T, Masuzaki S, Matsuoka K, Minami T, Miyazawa J, Muto S, Nagayama Y, Nakamura Y, Nakanishi H, Narushima Y, Nishimura K, Nishiura M, Nishizawa A, Noda N, Ohdachi S, Oka Y, Osakabe M, Ohyabu N, Ozaki T, Peterson BJ, Sagara A, Saito K, Sakamoto R, Sato K, Sato M, Seki T, Shoji M, Sudo S, Tamura N, Toi K, Tokuzawa T, Tsumori K, Uda T, Watari T, Yamada I, Yokoyama M, Yoshimura Y, Motojima O, Beidler CD, Fujita T, Isayama A, Sakamoto Y, Takenaga H, Goncharov P, Ishii K, Sakamoto M, Murakami S, Notake T, Takeuchi N, Okajima S, Sasao M. Overview of Progress in LHD Experiments. Fusion Science and Technology 2017. [DOI: 10.13182/fst06-a1229] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A. Komori
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Sakakibara
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Morita
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Narihara
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Tanaka
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Y. Watanabe
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H. Yamada
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Akiyama
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - N. Ashikawa
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Emoto
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Goto
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Ido
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Inagaki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Isobe
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H. Igami
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Itoh
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Kawahata
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Kobuchi
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Masuzaki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Matsuoka
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Minami
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - J. Miyazawa
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Muto
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Nagayama
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H. Nakanishi
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Narushima
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Nishimura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Nishiura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - A. Nishizawa
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - N. Noda
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Ohdachi
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Oka
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - N. Ohyabu
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Ozaki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - B. J. Peterson
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - A. Sagara
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Saito
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - R. Sakamoto
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Sato
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Sato
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Seki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Shoji
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Sudo
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - N. Tamura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Toi
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Tokuzawa
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Tsumori
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Uda
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Watari
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - I. Yamada
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - O. Motojima
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - C. D. Beidler
- Max-Planck Institut fuer Plasmaphysik, Greifswald D-17491, Germany
| | - T. Fujita
- Japan Atomic Energy Research Institute, Naka 311-0193, Japan
| | - A. Isayama
- Japan Atomic Energy Research Institute, Naka 311-0193, Japan
| | - Y. Sakamoto
- Japan Atomic Energy Research Institute, Naka 311-0193, Japan
| | - H. Takenaga
- Japan Atomic Energy Research Institute, Naka 311-0193, Japan
| | - P. Goncharov
- Graduate University for Advanced Studies, School of Mathematical and Physical Science Department of Fusion Science, Hayama 240-0193, Japan
| | - K. Ishii
- Kyushu University, Research Institute for Applied Mechanics Kasuga 816-8580, Japan
| | - M. Sakamoto
- Kyushu University, Research Institute for Applied Mechanics Kasuga 816-8580, Japan
| | - S. Murakami
- Kyoto University, Department of Nuclear Engineering, Kyoto 606-8501, Japan
| | - T. Notake
- Nagoya University, Department of Energy Engineering and Science Nagoya 464-8603, Japan
| | - N. Takeuchi
- Nagoya University, Department of Energy Engineering and Science Nagoya 464-8603, Japan
| | - S. Okajima
- Chubu University, Kasugai, Aichi 487-8501, Japan
| | - M. Sasao
- Tohoku University, Graduate School of Engineering, Sendai 980-8579, Japan
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7
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Mutoh T, Kumazawa R, Seki T, Saito K, Watari T, Torii Y, Takeuchi N, Shimpo F, Nomura G, Yokota M, Watanabe T, Osakabe M, Sasao M, Murakami S, Saida T, Okada H, Takase Y, Fukuyama A, Ashikawa N, Emoto M, Funaba H, Goncharov PR, Goto M, Hamada Y, Ida K, Idei H, Ikeda K, Imagawa S, Inagaki S, Isobe M, Kobuchi T, Kubo S, Masuzaki S, Matsuoka K, Minami T, Mito T, Miyazawa J, Morisaki T, Morita S, Muto S, Nagayama Y, Nakamura Y, Nakanishi H, Narihara K, Narushima Y, Nishimura K, Noda N, Notake T, Ohdachi S, Oka Y, Ozaki T, Peterson BJ, Sagara A, Sakakibara S, Sakamoto R, Sato K, Sato M, Shimozuma T, Shoji M, Suzuki H, Takeiri Y, Tamura N, Tanaka K, Toi K, Tokuzawa T, Tsumori K, Watanabe K, Yamada H, Yamada I, Yamazaki K, Yokoyama M, Yoshimura Y, Yoshinuma M, Kaneko O, Kawahata K, Ohyabu N, Ohkubo K, Komori A, Sudo S, Motojima O. Long-Pulse Operation and High-Energy Particle Confinement Study in ICRF Heating of LHD. Fusion Science and Technology 2017. [DOI: 10.13182/fst04-a553] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takashi Mutoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Ryuhei Kumazawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Tetsuo Seki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kenji Saito
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Tetsuo Watari
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yuki Torii
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Norio Takeuchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Fujio Shimpo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Goro Nomura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Mitsuhiro Yokota
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Tsuguhiro Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Masaki Osakabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Mamiko Sasao
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Sadayoshi Murakami
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Tomoya Saida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Hiroyuki Okada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yuichi Takase
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Atsushi Fukuyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Naoko Ashikawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Masahiko Emoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Hisamichi Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Pavel R. Goncharov
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Motoshi Goto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yasuji Hamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Katsumi Ida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Hiroshi Idei
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Katsunori Ikeda
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Shinsaku Imagawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Shigeru Inagaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Mitsutaka Isobe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Takashi Kobuchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Shin Kubo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Suguru Masuzaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Keisuke Matsuoka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Takashi Minami
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Toshiyuki Mito
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Jyunichi Miyazawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Tomohiro Morisaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Shigeru Morita
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Sadatsugu Muto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yoshio Nagayama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yukio Nakamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Hideya Nakanishi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kazumichi Narihara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yoshiro Narushima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kiyohiko Nishimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Nobuaki Noda
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Takashi Notake
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Satoshi Ohdachi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yoshihide Oka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Tetsuo Ozaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Byron J. Peterson
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Akio Sagara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Satoru Sakakibara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Ryuichi Sakamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kuninori Sato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Motoyasu Sato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Takashi Shimozuma
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Mamoru Shoji
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Hajime Suzuki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yasuhiko Takeiri
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Naoki Tamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kenji Tanaka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kazuo Toi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Tokihiko Tokuzawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Katsuyoshi Tsumori
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kiyomasa Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Hiroshi Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Ichihiro Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kozo Yamazaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Masayuki Yokoyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Yasuo Yoshimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Mikiro Yoshinuma
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Osamu Kaneko
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kazuo Kawahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Nobuyoshi Ohyabu
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Kunizo Ohkubo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Akio Komori
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Shigeru Sudo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
| | - Osamu Motojima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken, 509-5292, Japan
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8
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Saito K, Kumazawa R, Seki T, Kasahara H, Osakabe M, Isobe M, Shimpo F, Nomura G, Watari T, Murakami S, Sasao M, Mutoh T. ICRF Heating and Ion Tail Formation in LHD. Fusion Science and Technology 2017. [DOI: 10.13182/fst10-a10838] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- K. Saito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Seki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Kasahara
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Isobe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - F. Shimpo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - G. Nomura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Watari
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Murakami
- Kyoto University, Department of Nuclear Engineering, Kyoto 606-8501, Japan
| | - M. Sasao
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
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9
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Osakabe M, Isobe M, Murakami S, Kobayashi S, Saito K, Kumazawa R, Mutoh T, Ozaki T, Nishiura M, Veshchev E, Seki T, Takeiri Y, Kaneko O, Nagaoka K, Tokuzawa T, Ogawa K, Toi K, Yamamoto S, Sasao M, Watanabe T. Fast-Ion Confinement Studies on LHD. Fusion Science and Technology 2017. [DOI: 10.13182/fst10-a10800] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Osakabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Isobe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Murakami
- Kyoto University, Department of Nuclear Engineering, Kyoto 606-8501, Japan
| | - S. Kobayashi
- Institute of Advanced Energy, Kyoto University, Gokashou, Uji 611-0011, Japan
| | - K. Saito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Ozaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Nishiura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - E. Veshchev
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Seki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Tokuzawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ogawa
- Nagoya University, Department of Energy Science and Engineering, Nagoya 464-8603, Japan
| | - K. Toi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Yamamoto
- Institute of Advanced Energy, Kyoto University, Gokashou, Uji 611-0011, Japan
| | - M. Sasao
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Watanabe
- National Institute for Fusion Science, Toki 509-5292, Japan
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10
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Isobe M, Osakabe M, Ozaki T, Nishiura M, Goncharov PV, Veshchev E, Ogawa K, Nagaoka K, Saito K, Murakami S, Saida T, Sasao M, Toi K. Fast-Particle Diagnostics on LHD. Fusion Science and Technology 2017. [DOI: 10.13182/fst10-a10828] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Isobe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Ozaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Nishiura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | | | - E. Veshchev
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ogawa
- Nagoya University, Department of Energy Science and Engineering, Nagoya 464-8603, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Saito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Murakami
- Kyoto University, Department of Nuclear Engineering, Kyoto 606-8501, Japan
| | - T. Saida
- Tohoku University, Department of Quantum Energy Science, Sendai 980-8579, Japan
| | - M. Sasao
- Tohoku University, Department of Quantum Energy Science, Sendai 980-8579, Japan
| | - K. Toi
- National Institute for Fusion Science, Toki 509-5292, Japan
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11
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Kitajima S, Takahashi H, Tanaka Y, Utoh H, Takenaga M, Yokoyama M, Inagaki S, Suzuki Y, Nishimura K, Ogawa H, Shinde J, Ogawa M, Aoyama H, Iwazaki K, Okamoto A, Shinto K, Sasao M. Effects of Rational Surfaces and Magnetic Islands on Radial Electric Fields and Ion Viscosity in Tohoku University Heliac. Fusion Science and Technology 2017. [DOI: 10.13182/fst06-a1236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Kitajima
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - H. Takahashi
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - Y. Tanaka
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - H. Utoh
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - M. Takenaga
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki, Japan
| | - S. Inagaki
- National Institute for Fusion Science, Toki, Japan
| | - Y. Suzuki
- National Institute for Fusion Science, Toki, Japan
| | - K. Nishimura
- National Institute for Fusion Science, Toki, Japan
| | - H. Ogawa
- Japan Atomic Energy Agency, Naka, Japan
| | - J. Shinde
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - M. Ogawa
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - H. Aoyama
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - K. Iwazaki
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - A. Okamoto
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - K. Shinto
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
| | - M. Sasao
- Tohoku University, Department of Quantum Science and Energy Engineering, Aoba, Aramaki, Sendai 980-8579, Japan
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12
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Motojima O, Yamada H, Komori A, Watanabe KY, Mutoh T, Takeiri Y, Ida K, Akiyama T, Asakura N, Ashikawa N, Chikaraishi H, Cooper WA, Emoto M, Fujita T, Fujiwara M, Funaba H, Goncharov P, Goto M, Hamada Y, Higashijima S, Hino T, Hoshino M, Ichimura M, Idei H, Ido T, Ikeda K, Imagawa S, Inagaki S, Isayama A, Isobe M, Itoh T, Itoh K, Kado S, Kalinina D, Kaneba T, Kaneko O, Kato D, Kato T, Kawahata K, Kawashima H, Kawazome H, Kobuchi T, Kondo K, Kubo S, Kumazawa R, Lyon JF, Maekawa R, Mase A, Masuzaki S, Mito T, Matsuoka K, Miura Y, Miyazawa J, More R, Morisaki T, Morita S, Murakami I, Murakami S, Mutoh S, Nagaoka K, Nagasaki K, Nagayama Y, Nakamura Y, Nakanishi H, Narihara K, Narushima Y, Nishimura H, Nishimura K, Nishiura M, Nishizawa A, Noda N, Notake T, Nozato H, Ohdachi S, Ohkubo K, Ohyabu N, Oyama N, Oka Y, Okada H, Osakabe M, Ozaki T, Peterson BJ, Sagara A, Saida T, Saito K, Sakakibara S, Sakamoto M, Sakamoto R, Sasao M, Sato K, Seki T, Shimozuma T, Shoji M, Sudo S, Takagi S, Takahashi Y, Takase Y, Takenaga H, Takeuchi N, Tamura N, Tanaka K, Tanaka M, Toi K, Takahata K, Tokuzawa T, Torii Y, Tsumori K, Watanabe F, Watanabe M, Watanabe T, Watari T, Yamada I, Yamada S, Yamaguchi T, Yamamoto S, Yamazaki K, Yanagi N, Yokoyama M, Yoshida N, Yoshimura S, Yoshimura Y, Yoshinuma M. Review on the Progress of the LHD Experiment. Fusion Science and Technology 2017. [DOI: 10.13182/fst04-a535] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- O. Motojima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Komori
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Y. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Akiyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Asakura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Ashikawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Chikaraishi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - W. A. Cooper
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Emoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Fujita
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Fujiwara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - P. Goncharov
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Goto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Hamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Higashijima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Hino
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Hoshino
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Ichimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Idei
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Ido
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Imagawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Inagaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Isayama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Isobe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Itoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Itoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Kado
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - D. Kalinina
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Kaneba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - D. Kato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Kato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Kawahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Kawashima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Kawazome
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Kobuchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Kondo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - J. F. Lyon
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. Maekawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Mase
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Masuzaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Mito
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Matsuoka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Miura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - J. Miyazawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. More
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Morita
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - I. Murakami
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Murakami
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Mutoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Nagasaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Nagayama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Nakanishi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Narihara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Narushima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Nishimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Nishimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Nishiura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Nishizawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Noda
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Notake
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Nozato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Ohdachi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Ohyabu
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Oyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Oka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Okada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Ozaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - B. J. Peterson
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Sagara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Saida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Saito
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Sakakibara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Sakamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. Sakamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Sasao
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Sato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Seki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Shoji
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Sudo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Takagi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Takahashi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Takase
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Takenaga
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Takeuchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Tamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Tanaka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Tanaka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Toi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Takahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Tokuzawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Torii
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Tsumori
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - F. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Watari
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - I. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Yamaguchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Yamamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Yamazaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Yanagi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Yoshida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Yoshimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
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13
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Sasao M, Nishitani T, Krasilnilov A, Popovichev S, Kiptily V, Kallne J. Chapter 9: Fusion Product Diagnostics. Fusion Science and Technology 2017. [DOI: 10.13182/fst08-a1681] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Sasao
- Tohoku University, Sendai 980-8579, Japan
| | - T. Nishitani
- Japan Atomic Energy Agency, Naka, Ibaraki 319-0195, Japan
| | | | - S. Popovichev
- EURATOM-UKAEA Fusion Association Culham S.C., OX14 3DB, United Kingdom
| | - V. Kiptily
- EURATOM-UKAEA Fusion Association Culham S.C., OX14 3DB, United Kingdom
| | - J. Kallne
- Uppsala University, Department of Neutron Research, Uppsala, Sweden
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14
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Murakami S, Yamada H, Sasao M, Isobe M, Ozaki T, Saida T, Goncharov P, Lyon JF, Osakabe M, Seki T, Takeiri Y, Oka Y, Tumori K, Ikeda K, Mutoh T, Kumazawa R, Saito K, Torii Y, Watari T, Wakasa A, Watanabe KY, Funaba H, Yokoyama M. Effect of Neoclassical Transport Optimization on Energetic Ion Confinement in LHD. Fusion Science and Technology 2017. [DOI: 10.13182/fst04-a561] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Murakami
- Kyoto University, Department of Nuclear Engineering, Kyoto 606-8501, Japan
| | - H. Yamada
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Sasao
- Tohoku University, Graduate School of Engineering, Sendai 980-8579, Japan
| | - M. Isobe
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Ozaki
- Tohoku University, Graduate School of Engineering, Sendai 980-8579, Japan
| | - T. Saida
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - P. Goncharov
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8072
| | - J. F. Lyon
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Seki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Oka
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Tumori
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Saito
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Torii
- Nagoya University, Department of Energy Engineering and Science, 464-8603, Japan
| | - T. Watari
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - A. Wakasa
- Hokkaido University, Graduate School of Engineering, Sapporo 060-8628, Japan
| | - K. Y. Watanabe
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Yokoyama
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-17491 Greifswald, Germany
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15
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Bacal M, Sasao M, Wada M, McAdams R. Optimum plasma grid bias for a negative hydrogen ion source operation with Cs. Rev Sci Instrum 2016; 87:02B132. [PMID: 26932014 DOI: 10.1063/1.4935007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The functions of a biased plasma grid of a negative hydrogen (H(-)) ion source for both pure volume and Cs seeded operations are reexamined. Proper control of the plasma grid bias in pure volume sources yields: enhancement of the extracted negative ion current, reduction of the co-extracted electron current, flattening of the spatial distribution of plasma potential across the filter magnetic field, change in recycling from hydrogen atomic/molecular ions to atomic/molecular neutrals, and enhanced concentration of H(-) ions near the plasma grid. These functions are maintained in the sources seeded with Cs with additional direct emission of negative ions under positive ion and neutral hydrogen bombardment onto the plasma electrode.
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Affiliation(s)
- Marthe Bacal
- UPMC, LPP, Ecole Polytechnique, UMR CNRS 7648, Palaiseau, France
| | - Mamiko Sasao
- R&D Promotion Organization, Doshisha University, Kamigyoku, Kyoto 602-8580, Japan
| | - Motoi Wada
- School of Science and Engineering, Doshisha University, Kyotonabe, Kyoto 610-0321, Japan
| | - Roy McAdams
- CCFE, Culham Science Center, Abingdon, Oxfordshire 0X14 3DB, United Kingdom
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16
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Shinohara K, Ishii K, Ochiai K, Baba M, Sukegawa A, Sasao M, Kitajima S. Evaluation of two-stage system for neutron measurement aiming at increase in count rate at Japan Atomic Energy Agency-Fusion Neutronics Source. Rev Sci Instrum 2014; 85:11E823. [PMID: 25430388 DOI: 10.1063/1.4893941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In order to increase the count rate capability of a neutron detection system as a whole, we propose a multi-stage neutron detection system. Experiments to test the effectiveness of this concept were carried out on Fusion Neutronics Source. Comparing four configurations of alignment, it was found that the influence of an anterior stage on a posterior stage was negligible for the pulse height distribution. The two-stage system using 25 mm thickness scintillator was about 1.65 times the count rate capability of a single detector system for d-D neutrons and was about 1.8 times the count rate capability for d-T neutrons. The results suggested that the concept of a multi-stage detection system will work in practice.
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Affiliation(s)
- K Shinohara
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - K Ishii
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - K Ochiai
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Baba
- Cyclotron and Radioisotope Center, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - A Sukegawa
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Sasao
- Organization for Research Initiatives and Development, Doshisha University, Kyoto 602-8580, Japan
| | - S Kitajima
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
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17
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Matsumoto Y, Nishiura M, Yamaoka H, Sasao M, Wada M. Influence of electric field penetration by a three-electrode beam extraction system on hydrogen negative ion source plasma. Rev Sci Instrum 2014; 85:02A720. [PMID: 24593454 DOI: 10.1063/1.4833918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We study influence of electric field penetration into H(-) ion source plasma with three-electrode beam extraction system. Clear change in the plasma potential due to the field penetration is observed in case of low gap voltage between a plasma electrode and an extraction electrode. Influence of lens voltage on the second electrode, which is normally utilized to focus the extracted beam, on ion source plasma is evaluated separating contributions of H(-) density in the plasma and extraction probability of H(-) ions from the plasma by two kinds of photodetachment techniques. In our operation condition, we found that the lens voltage is also useful to enhance the H(-) density in the plasma, though it negatively affects the extraction probability.
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Affiliation(s)
- Y Matsumoto
- Tokushima Bunri University, Nishihama, Yamashiro, Tokushima 770-8514, Japan
| | - M Nishiura
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - H Yamaoka
- RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - M Sasao
- Organization for Research Initiatives and Development, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - M Wada
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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18
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Wada M, Kasuya T, Kenmotsu T, Sasao M. Angular distributions of surface produced H(-) ions for reflection and desorption processes. Rev Sci Instrum 2014; 85:02B114. [PMID: 24593554 DOI: 10.1063/1.4833928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A numerical simulation code, Atomic Collision in Amorphous Target, has been run to clarify the effects due to the incident angle of hydrogen flux onto surface collision cascade in the subsurface region of a Cs covered Mo plasma grid. The code has taken into account the threshold energy for negative hydrogen (H(-)) ions to leave the surface. This modification has caused the shift of energy distribution functions of H(-) from that of hydrogen atoms leaving the surface. The results have shown that large incident angle of hydrogen particle tilt the angular distribution of reflection component, while it caused a small effect onto the angular distribution of desorption component. The reflection coefficient has increased, while the desorption yield has decreased for increased angle of incidence measured from the surface normal.
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Affiliation(s)
- M Wada
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - T Kasuya
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - T Kenmotsu
- Faculty of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - M Sasao
- Organization for Research Initiatives and Development, Doshisha University, Kamigyoku, Kyoto 602-8580, Japan
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19
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Tanaka N, Kato S, Miyamoto T, Nishiura M, Tsumori K, Matsumoto Y, Kenmotsu T, Okamoto A, Kitajima S, Sasao M, Wada M, Yamaoka H. Effects of roughness and temperature on low-energy hydrogen positive and negative ion reflection from silicon and carbon surfaces. Rev Sci Instrum 2014; 85:02C311. [PMID: 24593648 DOI: 10.1063/1.4855455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Angle-resolved energy distribution functions of positive and negative hydrogen ions produced from a rough-finished Si surface under 1 keV proton irradiation have been measured. The corresponding distribution from a crystalline surface and a carbon surface are also measured for comparison. Intensities of positive and negative ions from the rough-finished Si are substantially smaller than those from crystalline Si. The angular distributions of these species are broader for rough surface than the crystalline surface. No significant temperature dependence for positive and negative ion intensities is observed for all samples in the temperature range from 300 to 400 K.
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Affiliation(s)
- N Tanaka
- Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - S Kato
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - T Miyamoto
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - M Nishiura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K Tsumori
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y Matsumoto
- Tokushima Bunri University, Yamashiro, Tokushima 770-8514, Japan
| | - T Kenmotsu
- Faculty of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - A Okamoto
- School of Engineering, Tohoku University, Aoba, Sendai, Miyagi 980-8579, Japan
| | - S Kitajima
- School of Engineering, Tohoku University, Aoba, Sendai, Miyagi 980-8579, Japan
| | - M Sasao
- Organization for Research Initiatives and Development, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - M Wada
- Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - H Yamaoka
- RIKEN SPring-8 Center, Mikazuki, Sayo, Hyogo 679-5148, Japan
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20
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Tanaka N, Sasao M, Terai K, Okamoto A, Kitajima S, Yamaoka H, Wada M. Development of a He- and He0 beam source for alpha particle measurement in a burning plasma. Rev Sci Instrum 2012; 83:02B115. [PMID: 22380272 DOI: 10.1063/1.3672113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Proof of principle experiments of neutral helium beam production for alpha particle diagnostics was carried out on a test stand. Negative helium ions were produced in the Li charge exchange cell, in which stable and long time operation was possible. He(-) beam was accelerated to 157 keV. Finally, He(0) beam was successfully produced after the flight in the drift-tube through the auto-electron-detachment process from He(-) to He(0). A neutral beam detector using a pyroelectric device was also developed to measure He(0) beam intensity. The metastable component in the neutral helium beam was found to be less than 2%.
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Affiliation(s)
- N Tanaka
- Tohoku University, Aoba, Sendai 980-8579, Japan.
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21
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Kobuchi T, Sasao M, Kisaki M, Tsumori K, Tanaka N, Okamoto A, Kitajima S, Kaneko O, Shinto K, Wada M. Extraction of a strongly focusing He+ beam from three-stage concave electrodes for alpha particle measurement system in ITER. Rev Sci Instrum 2012; 83:02B120. [PMID: 22380277 DOI: 10.1063/1.3673630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A strongly focusing He(+) ion beam source equipped with concave multi-aperture electrodes was developed for production of He(-) through a charge exchange cell. The beam was extracted at a voltage less than 20 kV from 301 apertures distributed in an area of 100 mm φ, and focused at 750 mm distance. The beam current and the beam size of 2 A and 20 mm in diameter, respectively, were achieved with an arc power less than 10 kW. The optimum perveance was obtained at 0.02 A∕kV(1.5) at the beam energy less than 20 keV which is suitable for the conversion to He(-) in an alkali vapor cell.
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Affiliation(s)
- T Kobuchi
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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22
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Sasao M, Kisaki M, Kobuchi T, Tsumori K, Tanaka N, Terai K, Okamoto A, Kitajima S, Kaneko O, Shinto K, Wada M. An alpha particle measurement system using an energetic neutral helium beam in ITER (invited). Rev Sci Instrum 2012; 83:02B718. [PMID: 22380323 DOI: 10.1063/1.3673493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
An energetic helium neutral beam is involved in the beam neutralization measurement system of alpha particles confined in a DT fusion plasma. A full size strong-focusing He(+) ion source (2 A, the beam radius of 11.3 mm, the beam energy less than 20 keV). Present strong-focusing He(+) ion source shows an emittance diagram separated for each beamlet of multiple apertures without phase space mixing, despite the space charge of a beamlet is asymmetric and the beam flow is non-laminar. The emittance of beamlets in the peripheral region was larger than that of center. The heat load to the plasma electrode was studied to estimate the duty factor for the ITER application.
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Affiliation(s)
- M Sasao
- Graduate school of Engineering, Tohoku University, Sendai 980-8579, Japan.
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23
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Abstract
Accuracy of 10% is demanded to the absolute fusion measurement on ITER. To achieve this accuracy, a functional combination of several types of neutron measurement subsystem, cross calibration among them, and in situ calibration are needed. Neutron transport calculation shows the suitable calibration source is a DT/DD neutron generator of source strength higher than 10(10) n/s (neutron/second) for DT and 10(8) n/s for DD. It will take eight weeks at the minimum with this source to calibrate flux monitors, profile monitors, and the activation system.
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Affiliation(s)
- M Sasao
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan.
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24
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Isobe M, Yamanishi H, Osakabe M, Miyake H, Tomita H, Watanabe K, Iwai H, Nomura Y, Nishio N, Ishii K, Kaneko JH, Kawarabayashi J, Takada E, Uritani A, Sasao M, Iguchi T, Takeiri Y, Yamada H. Fusion product diagnostics planned for Large Helical Device deuterium experiment. Rev Sci Instrum 2010; 81:10D310. [PMID: 21033836 DOI: 10.1063/1.3492383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Deuterium experiment on the Large Helical Device (LHD) is now being planned at the National Institute for Fusion Science. The fusion product diagnostics systems currently considered for installation on LHD are described in this paper. The systems will include a time-resolved neutron yield monitor based on neutron gas counters, a time-integrated neutron yield monitor based on activation techniques, a multicollimator scintillation detector array for diagnosing spatial distribution of neutron emission rate, 2.5 MeV neutron spectrometer, 14 MeV neutron counter, and prompt γ-ray diagnostics.
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Affiliation(s)
- M Isobe
- National Institute for Fusion Science, Toki 509-5292, Japan.
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25
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Nishiura M, Nagasaka T, Fujioka K, Fujimoto Y, Tanaka T, Ido T, Yamamoto S, Kashiwa S, Sasao M. Development and irradiation test of lost alpha detection system for ITER. Rev Sci Instrum 2010; 81:10D313. [PMID: 21033839 DOI: 10.1063/1.3485118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We developed a lost alpha detection system to use in burning plasma experiments. The scintillators of Ag:ZnS and polycrystalline Ce:YAG were designed for a high-temperature environment, and the optical transmission line was designed to transmit from the scintillator to the port plug. The required optical components of lenses and mirrors were irradiated using the fission reactor with the initial result that there was no clear change after the irradiation with a neutron flux of 9.6×10(17) nm(-2) s(-1) for 48 h. We propose a diagnostic of alpha particle loss, so-called alpha particle induced gamma ray spectroscopy. The initial laboratory test has been carried out by the use of the Ce doped Lu(2)SiO(5) scintillator detector and an Am-Be source to detect the 4.44 MeV high energy gamma ray due to the (9)Be(α,nγ)(12)C reaction.
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Affiliation(s)
- M Nishiura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
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26
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Ishii K, Shinohara K, Ishikawa M, Baba M, Isobe M, Okamoto A, Kitajima S, Sasao M. Fast neutron-gamma discrimination on neutron emission profile measurement on JT-60U. Rev Sci Instrum 2010; 81:10D334. [PMID: 21033854 DOI: 10.1063/1.3496986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A digital signal processing (DSP) system is applied to stilbene scintillation detectors of the multichannel neutron emission profile monitor in JT-60U. Automatic analysis of the neutron-γ pulse shape discrimination is a key issue to diminish the processing time in the DSP system, and it has been applied using the two-dimensional (2D) map. Linear discriminant function is used to determine the dividing line between neutron events and γ-ray events on a 2D map. In order to verify the validity of the dividing line determination, the pulse shape discrimination quality is evaluated. As a result, the γ-ray contamination in most of the beam heating phase was negligible compared with the statistical error with 10 ms time resolution.
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Affiliation(s)
- K Ishii
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan.
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27
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Abstract
Full orbit-following calculation is performed for the final orbit of the lost alpha particles, showing some orbits escaping from the last closed flux surface could be detected by a concealed lost ion probe (CLIP) installed under the shadow of the original first wall surface. While both passing and trapped orbits hit the same wall panel, detecting a trapped orbit by the CLIP is easier than detecting passing orbits. Whether the final orbit is detected or not is determined by the position of the reflection point. The CLIP successfully detects the trapped orbits, which are reflected before they hit to a first wall. Then the pitch angles of the orbits at the CLIP are close to and smaller than 90°. Optimization of the position of the CLIP in terms of broader detection window is investigated.
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Affiliation(s)
- A Okamoto
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan.
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28
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Kawahata K, Peterson BJ, Akiyama T, Ashikawa N, Emoto M, Funaba H, Hamada Y, Ida K, Inagaki S, Ido T, Isobe M, Goto M, Mase A, Masuzaki S, Michael C, Morisaki T, Morita S, Muto S, Nagayama Y, Nakamura Y, Nakanishi H, Sakamoto R, Narihara K, Nishiura M, Ohdachi S, Okajima S, Osakabe M, Sakakibara S, Sanin A, Sasao M, Sato K, Shimizu A, Shoji M, Sudo S, Tamura N, Tanaka K, Toi K, Tokuzawa T, Veshchev EV, Vyacheslavov LN, Yamada I, Yoshinuma M. Overview of LHD Plasma Diagnostics. Fusion Science and Technology 2010. [DOI: 10.13182/fst10-a10819] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- K. Kawahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - B. J. Peterson
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - T. Akiyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - N. Ashikawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - M. Emoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - Y. Hamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - S. Inagaki
- Kyushu University, Kasuga 816-8580, Japan
| | - T. Ido
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - M. Isobe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - M. Goto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - A. Mase
- Kyushu University, Kasuga 816-8580, Japan
| | - S. Masuzaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - C. Michael
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - S. Morita
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - S. Muto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - Y. Nagayama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - H. Nakanishi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - R. Sakamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - K. Narihara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - M. Nishiura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - S. Ohdachi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - S. Okajima
- Chubu University, Kasugai 487-8501, Japan
| | - M. Osakabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - S. Sakakibara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - A. Sanin
- Budkel Institute of Nuclear Physics, Novosibirsk 630090, Russia
| | - M. Sasao
- Tohoku University, Sendai 980-8579, Japan
| | - K. Sato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - A. Shimizu
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - M. Shoji
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - S. Sudo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - N. Tamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - K. Tanaka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - K. Toi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - T. Tokuzawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - E. V. Veshchev
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | | | - I. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
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29
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Sasao M, Kobuchi T, Kisaki M, Takahashi H, Okamoto A, Kitajima S, Kaneko O, Tsumori K, Shinto K, Wada M. Fine-structure characteristics in the emittance images of a strongly focusing He+ beam. Rev Sci Instrum 2010; 81:02B115. [PMID: 20192421 DOI: 10.1063/1.3277211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The phase space distribution of a strongly focused He(+) ion beam source equipped with concave multiaperture electrodes was measured using a pepper-pot plate and a Kapton foil. The substructure of 301 merging He beamlets was clearly observed on a footprint of pepper-pot hole at the beam waist, where the beam density was 500 mA/cm(2). The position and the width of each beamlet substructure show the effect of interference of beamlets with surrounding one.
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Affiliation(s)
- M Sasao
- Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
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30
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Matsumoto Y, Nishiura M, Shinto K, Yamaoka H, Sasao M, Wada M. Influence of H- velocity on H- extraction probability from a negative ion source. Rev Sci Instrum 2010; 81:02B701. [PMID: 20192441 DOI: 10.1063/1.3271436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We investigate influence of H(-) initial transport direction and kinetic energy on H(-) extraction probability with three-dimensional Monte Carlo calculation. As a result, lower energy H(-) ions are strongly trapped by the electrical potential structure, so that initial condition of H(-) transport direction is cancelled by alignment of the electric field; thus, it has lower influence for H(-) extraction probability. Besides, the potential hill induced by the beam extraction voltage more effectively enhances H(-) extraction probability for the lower energy H(-) ions. The correlation between the magnitude of the local plasma potential near the extraction region and the mean velocity of H(-) ions in the region should determine the H(-) extraction probability from the ion source.
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Affiliation(s)
- Y Matsumoto
- Tokushima Bunri University, Nishihama, Yamashiro-cho, Tokushima 770-8514, Japan.
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31
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Kobuchi T, Kisaki M, Shinto K, Okamoto A, Kitajima S, Sasao M, Tsumori K, Kaneko O, Sakakita H, Kiyama S, Hirano Y, Wada M. Effects of filament geometry on the arc efficiency of a high-intensity He+ ion source. Rev Sci Instrum 2008; 79:10F316. [PMID: 19044629 DOI: 10.1063/1.2965781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A strongly focusing high-intensity He(+) ion source equipped with three concave electrodes has been designed and constructed as the beam source for a high-energy He(0) neutral beam probe system to diagnose fusion-produced alpha particles in thermonuclear fusion plasmas. The reduction of heat load onto the concave extraction electrodes is particularly important for a long pulse operation, as the heat load deforms the electrodes and thus the beam focal length. The effects on the arc efficiency (beam current/arc power) of the ion source due to the discharge filament structure (straight-type and L-shape-type filaments), size (filament diameters of 2 and 1.5 mm), number, and the locations have been studied. Choice of the appropriate filament structure improved the arc efficiency by 17%.
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Affiliation(s)
- T Kobuchi
- School of Engineering, Tohoku University, Sendai 980-0579, Japan
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32
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Funaki D, Isobe M, Nishiura M, Sato Y, Okamoto A, Kobuchi T, Kitajima S, Sasao M. Full orbit calculation for lost alpha particle measurement on ITER. Rev Sci Instrum 2008; 79:10E512. [PMID: 19044496 DOI: 10.1063/1.2974810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
An orbit following calculation code with full gyromotion under the ITER magnetic field configuration has been developed to investigate escaping alpha particle orbits in ITER and to determine the geometrical arrangement for alpha particle detection. The code contained the full geometrical information of the first wall panels. It was carefully investigated whether an alpha particle escaping from the plasma through the last closed flux surface does not touch or intersect the first wall boundary before reaching the detection point. Candidates of blanket module modification have been studied to achieve effective measurement geometry for escaping alpha particle detection. The calculations showed that direct orbit loss and banana diffusion can be detected with a probe head recessed from the first wall surface.
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Affiliation(s)
- D Funaki
- Department of Quantum Energy Science, Tohoku University, Sendai 980-8579, Japan.
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33
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Sugawara H, Shinto K, Tanaka N, Takeuchi S, Kikuchi M, Okamoto A, Kitajima S, Sasao M, Wada M. Diagnostics of a He(+) beam extracted from a compact magnetic bucket-type ion source. Rev Sci Instrum 2008; 79:02B708. [PMID: 18315199 DOI: 10.1063/1.2802282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Performance of a compact He(+) ion source was investigated before installing it to the experiment system developed for studying the efficiency of autodetachment neutralization from He(-) to He(0). Dependence of the extracted ion current upon the plasma parameters and that upon the extraction voltage indicated that the source performance was limited by space charge effect. The beam emittance was measured with a multislit system for various operation conditions. The experimentally determined emittance agreed well with the emittance obtained from ion trajectories calculated with input plasma parameters measured by a Langmuir probe. The beam current density of 60 mA/cm(2) and the emittance of less than 25pi mm mrad are expected to deliver enough current to the downstream of the He(-) neutralizer system to clarify factors affecting the final He(0) intensity.
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34
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Takeuchi S, Sasao M, Sugawara H, Tanaka N, Kisaki M, Okamoto A, Shinto K, Kitajima S, Nishiura M, Wada M. Energy straggling of low-energy ion beam in a charge exchange cell for negative ion production. Rev Sci Instrum 2008; 79:02A509. [PMID: 18315130 DOI: 10.1063/1.2816665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Energy straggling in a charge exchange cell, which is frequently used for negative ion production, was studied experimentally and compared with the results of theoretical evaluation. The change of the energy spectrum of a He(+) beam due to charge exchange processes in argon gas was measured in the energy range of 2-6 keV. Energy straggling by multiple collisions is expressed by the energy loss formula due to inelastic and elastic processes. The impact parameter is related to the elastic scattering angle, and the geometry of the charge exchange cell and other components of the beam transportation system determines the maximum acceptable scattering angle. The energy spread was evaluated taking the integral limit over the impact parameter into consideration. The theoretical results showed good agreement with those of actual measurement.
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35
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Kisaki M, Shinto K, Kobuchi T, Okamoto A, Kitajima S, Sasao M, Tsumori K, Nishiura M, Kaneko O, Matsuda Y, Wada M, Sakakita H, Kiyama S, Hirano Y. Development of a strongly focusing high-intensity He(+) ion source for a confined alpha particle measurement at ITER. Rev Sci Instrum 2008; 79:02C113. [PMID: 18315239 DOI: 10.1063/1.2801543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A strongly focusing high-intensity He(+) ion source has been designed and constructed as a beam source for a high-energy He(0) beam probe system for diagnosis of fusion produced alpha particles in the thermonuclear fusion plasmas. The He(+) beam was extracted from the ion source at an acceleration voltage of 18-35 kV. Temperature distributions of the beam target were observed with an IR camera. The 1/e-holding beam profile half-width was about 15 mm at optimum perveance (Perv) of 0.03 (I(beam)=2.4 A). A beam current about 3 A was achieved at an acceleration voltage of 26.7 kV with an arc power of 10 kW (Perv=0.023).
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Affiliation(s)
- M Kisaki
- School of Engineering, Tohoku University, Sendai, Japan.
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36
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Tanaka N, Kikuchi M, Nagamura T, Sugawara H, Takeuchi S, Kobuchi T, Okamoto A, Shinto K, Kitajima S, Sasao M, Wada M. A beam transport system for an intense He(-) beam source. Rev Sci Instrum 2008; 79:02A512. [PMID: 18315133 DOI: 10.1063/1.2816967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We have been developing a test stand for fast He(0) beam production. One of the major issues is how to transport effectively the He(+) and He(-) beams from which the He(0) beam is produced. The beam should be focused in two transverse focal points, the center of the charge exchange cell and the electrostatic accelerator. We studied the beam transport system and effect of space charge neutralization in the test stand by experiments and calculation.
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Affiliation(s)
- N Tanaka
- Tohoku University, Aoba, Sendai, Japan.
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37
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Yamaoka H, Tanaka N, Tsumori K, Nishiura M, Kenmotsu T, Hirouchi T, Kisaki M, Shinto K, Sasao M, Matsumoto Y, Wada M. Time-of-flight analyzer system to detect reflected particles from a solid surface following low-energy particle injection. Rev Sci Instrum 2008; 79:02C701. [PMID: 18315254 DOI: 10.1063/1.2796173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We have developed a time-of-flight analyzer to measure energy distributions of reflected particles from solid surfaces bombarded by low-energy (1-2 keV) ions. The analyzer yields energy distributions of neutrals which can be compared with the energy distributions of charged particles measured by a magnetic deflection-type momentum analyzer. We have tested the system to measure the angular dependence of energy and intensity for neutrals reflected from a polycrystalline W target. The energies of the reflected neutrals are much smaller than the incident ion energies, suggesting multiple scattering in the target. No angular dependence is observed under the condition that the sum of the incident and reflected angles is constant. The intensity of the reflected neutrals takes the maximum around the mirror angle. We compare these characteristics of neutral particle reflections with those of reflected ions.
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Affiliation(s)
- H Yamaoka
- Harima Institute, RIKEN (The Institute of Physical and Chemical Research), Sayo, Hyogo, Japan.
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38
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Matsumoto Y, Nishiura M, Sasao M, Yamaoka H, Shinto K, Wada M. Importance of electric field for H(-) extraction in a volume-type hydrogen negative ion source. Rev Sci Instrum 2008; 79:02B909. [PMID: 18315224 DOI: 10.1063/1.2816951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The effect upon extraction of negative hydrogen ions (H(-)) due to electric field near the extractor hole of a H(-) source is studied experimentally and theoretically. Probe measurements show that the extraction electric field penetrates into the plasma in the region near the extractor hole. Based on this observation a three-dimensional H(-) trajectory calculation that takes into account the local electric field distribution near the plasma electrode has been carried out. The validity of the trajectory calculation was examined by comparing the results with experimentally measured changes in H(-) current detected by a Faraday cup due to irradiation of a pulse laser beam in the region close to the extractor hole. The calculation results qualitatively explain the changes in H(-) current observed in the experiment. The calculation results also predict that the amount of H(-) current passing through the extractor hole changes with the electric field: the penetration of the electric field substantially enhances the H(-) extraction current, because it produces an electric field to attract H(-) toward the extraction hole.
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Affiliation(s)
- Y Matsumoto
- Tokushima Bunri University, Nishihama, Tokushima, Japan.
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39
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Sasao M. Advanced Diagnostics for Burning Plasma Experiments. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Sasao
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
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40
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Ogawa M, Ogawa H, Takahashi H, Tanaka Y, Utoh H, Shinde J, Iwazaki K, Aoyama H, Umetsu H, Okamoto A, Shinto K, Kitajima S, Yokoyama M, Inagaki S, Suzuki Y, Nishimura K, Sasao M. Ion Temperature Measurements in Tohoku University Heliac for Analysis of the Improved Mode Transition. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Ogawa
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - H. Ogawa
- Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1184, Japan
| | - H. Takahashi
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - Y. Tanaka
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - H. Utoh
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - J. Shinde
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - K. Iwazaki
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - H. Aoyama
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - H. Umetsu
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - A. Okamoto
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - K. Shinto
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - S. Kitajima
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - S. Inagaki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - Y. Suzuki
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - K. Nishimura
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
| | - M. Sasao
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
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41
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Takahashi H, Utoh H, Kitajima S, Isobe M, Suzuki C, Takeuchi M, Ikeda R, Tanaka Y, Yokoyama M, Toi K, Okamura S, Sasao M. Hot Cathode Biasing Experiments in Helical Systems. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Takahashi
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - H. Utoh
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - S. Kitajima
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - M. Isobe
- National Institute for Fusion Science, Toki, Japan
| | - C. Suzuki
- National Institute for Fusion Science, Toki, Japan
| | - M. Takeuchi
- Nagoya University, Department of Energy Engineering and Science, Nagoya, Japan
| | - R. Ikeda
- Nagoya University, Department of Energy Engineering and Science, Nagoya, Japan
| | - Y. Tanaka
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki, Japan
| | - K. Toi
- National Institute for Fusion Science, Toki, Japan
| | - S. Okamura
- National Institute for Fusion Science, Toki, Japan
| | - M. Sasao
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
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42
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Utoh H, Nishimura K, Inagaki S, Takahashi H, Tanaka Y, Takenaga M, Ogawa M, Shinde J, Iwazaki K, Okamoto A, Shinto K, Kitajima S, Sasao M. High-Density Plasma Production by Hydrogen Storage Electrode in the Tohoku University Heliac. Fusion Science and Technology 2006. [DOI: 10.13182/fst06-a1266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Utoh
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - K. Nishimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Inagaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Takahashi
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - Y. Tanaka
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - M. Takenaga
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - M. Ogawa
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - J. Shinde
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - K. Iwazaki
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - A. Okamoto
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - K. Shinto
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - S. Kitajima
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
| | - M. Sasao
- Tohoku University, Department of Quantum Science and Energy Engineering Aoba, Aramaki, Sendai 980-8579, Japan
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43
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Nagayama Y, Kawahata K, Inagaki S, Peterson BJ, Sakakibara S, Tanaka K, Tokuzawa T, Watanabe KY, Ashikawa N, Chikaraishi H, Emoto M, Funaba H, Goto M, Hamada Y, Ichiguchi K, Ida K, Idei H, Ido T, Ikeda K, Imagawa S, Isayama A, Isobe M, Iwamoto A, Kaneko O, Kitagawa S, Komori A, Kubo S, Kumazawa R, Masuzaki S, Matsuoka K, Mito T, Miyazawa J, Morisaki T, Morita S, Motojima O, Murakami S, Mutoh T, Muto S, Nakajima N, Nakamura Y, Nakanishi H, Narihara K, Narushima Y, Nishimura A, Nishimura K, Nishizawa A, Noda N, Ohdachi S, Ohkubo K, Ohyabu N, Oka Y, Osakabe M, Ozaki T, Sagara A, Saito K, Sakamoto R, Sasao M, Sato K, Seki T, Shimozuma T, Shoji M, Suzuki H, Sudo S, Takahata K, Takeiri Y, Toi K, Tsumori K, Yamada H, Yamada I, Yamazaki K, Yanagi N, Yokoyama M, Yoshimura Y, Yoshinuma Y, Watari T. Sawtooth oscillation in current-carrying plasma in the large helical device. Phys Rev Lett 2003; 90:205001. [PMID: 12785901 DOI: 10.1103/physrevlett.90.205001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2002] [Indexed: 05/24/2023]
Abstract
Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the beta threshold of the sawtooth oscillation. When the central q value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.
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Affiliation(s)
- Y Nagayama
- National Institute for Fusion Science, Toki 509-5292, Japan
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44
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Ohyabu N, Ida K, Morisaki T, Narihara K, Komori A, Watanabe K, Narushima Y, Nagayama Y, Shoji M, Ashikawa N, Emoto M, Funaba H, Goto M, Idei H, Ikeda K, Inagaki S, Inoue N, Isobe M, Khlopenkov K, Kobuchi T, Kostrioukov A, Kubo S, Kumazawa R, Liang Y, Masuzaki S, Minami T, Miyazawa J, Morita S, Muto S, Mutoh T, Murakami S, Nakamura Y, Nakanishi H, Nishimura K, Noda N, Notake T, Ohkubo K, Ohdachi S, Oka Y, Osakabe M, Ozaki T, Peterson BJ, Sakamoto R, Sakakibara S, Sagara A, Saito K, Sasao M, Sato K, Sato M, Seki T, Shimozuma T, Sudo S, Suzuki H, Takeiri Y, Tanaka K, Tamura N, Toi K, Tokuzawa T, Torii Y, Tsumori K, Watanabe T, Yamazaki K, Yamada I, Yamamoto S, Yokoyama M, Yoshimura Y, Watari T, Xu Y, Kaneko O, Kawahata K, Yamada H, Motojima O. Island dynamics in the large-helical-device plasmas. Phys Rev Lett 2002; 88:055005. [PMID: 11863738 DOI: 10.1103/physrevlett.88.055005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2001] [Indexed: 05/23/2023]
Abstract
In the Large Helical Device plasma discharges, the size of an externally imposed island with mode number ( n/m = 1/1) decreases substantially when the plasma is collisionless ( nu(*)< approximately 1) and the beta is finite ( > approximately 0.1%) at the island location. For the collisional plasmas with finite beta, on the other hand, the size of the island increases. However, there is a threshold in terms of the vacuum island size below which the island enlargement is not seen.
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Affiliation(s)
- N Ohyabu
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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45
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Narihara K, Watanabe KY, Yamada I, Morisaki T, Tanaka K, Sakakibara S, Ida K, Sakamoto R, Ohyabu N, Ashikawa N, Emoto M, Funaba H, Goto M, Hayashi H, Idei H, Ikeda K, Inagaki S, Inoue N, Kaneko O, Kawahata K, Kobuchi T, Komori A, Kubo S, Kumazawa R, Masuzaki S, Miyazawa J, Morita S, Motojima O, Murakami S, Muto S, Mutoh T, Nagayama Y, Nakamura Y, Nakanishi H, Nishimura K, Noda N, Notake T, Ohdachi S, Oka Y, Ohkubo K, Osakabe M, Ozaki S, Peterson BJ, Sagara A, Saito K, Sasao H, Sasao M, Sato K, Sato M, Seki T, Shimozuma T, Shoji C, Sudo S, Suzuki H, Takayama A, Takechi M, Takeiri Y, Tamura N, Toi K, Tokuzawa N, Torii Y, Tsumori K, Watari T, Yamada H, Yamaguchi S, Yamamoto S, Yamazaki K, Yoshimura Y. Observation of the "self-healing" of an error field island in the large helical device. Phys Rev Lett 2001; 87:135002. [PMID: 11580597 DOI: 10.1103/physrevlett.87.135002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2001] [Indexed: 05/23/2023]
Abstract
It was observed that the vacuum magnetic island produced by an external error magnetic field in the large helical device shrank in the presence of plasma. This was evidenced by the disappearance of flat regions in the electron temperature profile obtained by Thomson scattering. This island behavior depended on the magnetic configuration in which the plasmas were produced.
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Affiliation(s)
- K Narihara
- National Institute for Fusion Science, Toki, 509-5292, Japan
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46
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Ida K, Funaba H, Kado S, Narihara K, Tanaka K, Takeiri Y, Nakamura Y, Ohyabu N, Yamazaki K, Yokoyama M, Murakami S, Ashikawa N, deVries PC, Emoto M, Goto M, Idei H, Ikeda K, Inagaki S, Inoue N, Isobe M, Itoh K, Kaneko O, Kawahata K, Khlopenkov K, Komori A, Kubo S, Kumazawa R, Liang Y, Masuzaki S, Minami T, Miyazawa J, Morisaki T, Morita S, Mutoh T, Muto S, Nagayama Y, Nakanishi H, Nishimura K, Noda N, Notake T, Kobuchi T, Ohdachi S, Ohkubo K, Oka Y, Osakabe M, Ozaki T, Pavlichenko RO, Peterson BJ, Sagara A, Saito K, Sakakibara S, Sakamoto R, Sanuki H, Sasao H, Sasao M, Sato K, Sato M, Seki T, Shimozuma T, Shoji M, Suzuki H, Sudo S, Tamura N, Toi K, Tokuzawa T, Torii Y, Tsumori K, Yamamoto T, Yamada H, Yamada I, Yamaguchi S, Yamamoto S, Yoshimura Y, Watanabe KY, Watari T, Hamada Y, Motojima O, Fujiwara M. Reduction of ion thermal diffusivity associated with the transition of the radial electric field in neutral-beam-heated plasmas in the large helical device. Phys Rev Lett 2001; 86:5297-5300. [PMID: 11384482 DOI: 10.1103/physrevlett.86.5297] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2001] [Indexed: 05/23/2023]
Abstract
Recent large helical device experiments revealed that the transition from ion root to electron root occurred for the first time in neutral-beam-heated discharges, where no nonthermal electrons exist. The measured values of the radial electric field were found to be in qualitative agreement with those estimated by neoclassical theory. A clear reduction of ion thermal diffusivity was observed after the mode transition from ion root to electron root as predicted by neoclassical theory when the neoclassical ion loss is more dominant than the anomalous ion loss.
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Affiliation(s)
- K Ida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292, Japan
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47
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Nishiura M, Sasao M, Wada M, Bacal M. Plasma perturbation induced by laser photodetachment. Phys Rev E Stat Nonlin Soft Matter Phys 2001; 63:036408. [PMID: 11308776 DOI: 10.1103/physreve.63.036408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2000] [Indexed: 05/23/2023]
Abstract
The plasma dynamics arising from laser photodetachment is discussed herein theoretically and experimentally. The hybrid fluid-kinetic model, where the positive ions and electrons are treated by the fluid theory and the negative ions are treated within the ballistic approximation, is extended and applied to the analysis of densities perturbed by laser photodetachment. The agreement between the theory and measured data confirms the validity of the considered plasma dynamics model. This model, including the positive ion perturbation, shows a good agreement with the time evolution and the spatial distribution of perturbed electron densities which are measured by a Langmuir probe inside and outside the laser beam. From the overshoot in the time evolution of perturbed electron current in the center of the laser beam, the positive ion temperature was found to be in the range 0.1-0.25 eV, while the electron temperature changes from 0.3 to 3.2 eV.
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Affiliation(s)
- M Nishiura
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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48
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Mutoh T, Kumazawa R, Seki T, Watari T, Saito K, Torii Y, Hartmann DA, Zhao Y, Sasao M, Isobe M, Osakabe M, Krasilnikov AV, Ozaki T, Narihara K, Nagayama Y, Inagaki S, Shimpo F, Nomura G, Yokota M, Akaishi K, Ashikawa N, Emoto M, Funaba H, Fukuyama A, Goto M. Ion heating and high-energy-particle production by ion-cyclotron heating in the large helical device. Phys Rev Lett 2000; 85:4530-4533. [PMID: 11082588 DOI: 10.1103/physrevlett.85.4530] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2000] [Indexed: 05/23/2023]
Abstract
Ion-cyclotron heating was applied to the Large Helical Device. When the proton-cyclotron resonance was near the saddle point of the magnetic field-strength plane, strong ion-cyclotron damping occurred. Under these conditions efficient plasma heating was achieved for more than one minute. A high-energy ion tail was observed, and the effective tail temperature was determined by a balance between the wave acceleration and the electron-drag relaxation. There was no apparent sign of particle orbit loss effect in the investigated density range of 0.8-1.3x10(19) m(-3).
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Affiliation(s)
- T Mutoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292 Japan
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49
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Yo T, Noguchi I, Kimura T, Sasao M, Amemiya Y, Sekiya H, Kobayashi K. [General anesthesia in a patient with Cornelia de Lange syndrome with restricted opening of the mouth]. Masui 1998; 47:611-4. [PMID: 9621675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Patients with Cornelia de Lange syndrome have many anomalies including micrognathia with a small mouth, a high arched palate, and a short neck, which might make laryngoscopy for tracheal intubation difficult during induction of general anesthesia. General anesthesia was performed in a patient with Cornelia de Lange syndrome, and restricted opening of the mouth, which had not been reported previously, was found during laryngoscopy. The possible causes were thought to be temporo-mandibular joint disorders, contracture of the masseter muscle due to injury by self-destructive tendencies, or elogated coronoid process. The potential difficulty with laryngoscopy should be considered for tracheal intubation in a patient with Cornelia de Lange syndrome.
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Affiliation(s)
- T Yo
- Department of Dental Anesthesiology, School of Dental Medicine, Tsurumi University, Yokohama
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50
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Sasao M, Isobe M, Osakabe M, Taniike A, Iguchi T, Takada H, Iida T, Wada M. Preparation for fusion product measurement on LHD. Fusion Engineering and Design 1997. [DOI: 10.1016/s0920-3796(96)00590-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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