1
|
Seltzman A, Anderson J, Forest C. Construction of an EBW Heating System for the MST RFP. EPJ WEB OF CONFERENCES 2019. [DOI: 10.1051/epjconf/201920302010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The first observation of rf heating in a reversed field pinch (RFP) using the electron Bernstein wave (EBW) has been demonstrated on Madison Symmetric Torus (MST). The design of the RF heating system used in this experiment is described. Klystron and antenna limitations are examined during launch into the plasma.
Collapse
|
2
|
Seltzman AH, Anderson JK, Diem SJ, Goetz JA, Forest CB. Observation of Electron Bernstein Wave Heating in a Reversed Field Pinch. PHYSICAL REVIEW LETTERS 2017; 119:185001. [PMID: 29219560 DOI: 10.1103/physrevlett.119.185001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Indexed: 06/07/2023]
Abstract
The first observation of rf heating in a reversed field pinch (RFP) using the electron Bernstein wave (EBW) is demonstrated on the Madison Symmetric Torus. Propagation across and heating in a stochastic magnetic field is observed. Novel techniques are required to measure the suprathermal electron tail generated by EBW heating in the presence of intense Ohmic heating. rf-heated electrons directly probe the edge transport properties in the RFP; measured loss rates imply a large noncollisional radial diffusivity.
Collapse
Affiliation(s)
- A H Seltzman
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - J K Anderson
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - S J Diem
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J A Goetz
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - C B Forest
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| |
Collapse
|
3
|
Shevchenko V, Cunningham G, Gurchenko A, Gusakov E, Lloyd B, O’Brien M, Saveliev A, Surkov A, Volpe F, Walsh M. Development of Electron Bernstein Wave Research in MAST. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst07-a1499] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- V. Shevchenko
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - G. Cunningham
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - A. Gurchenko
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - E. Gusakov
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - B. Lloyd
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - M. O’Brien
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - A. Saveliev
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - A. Surkov
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - F. Volpe
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - M. Walsh
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| |
Collapse
|
4
|
Shimozuma T, Kubo S, Yoshimura Y, Igami H, Nagasaki K, Notake T, Inagaki S, Ito S, Kobayashi S, Mizuno Y, Takita Y, Saito K, Seki T, Kumazawa R, Watari T, Mutoh T. Progress on Electron Cyclotron Heating and Electron Cyclotron Current Drive Experiments in LHD. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst06-a1262] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takashi Shimozuma
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Shin Kubo
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Yasuo Yoshimura
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Hiroe Igami
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Kazunobu Nagasaki
- Kyoto University, Institute of Advanced Energy Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takashi Notake
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Sigeru Inagaki
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Satoshi Ito
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Sakuji Kobayashi
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Yoshinori Mizuno
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Yasuyuki Takita
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Kenji Saito
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Tetsuo Seki
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Ryuhei Kumazawa
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Tetsuo Watari
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | - Takashi Mutoh
- National Institute for Fusion Science, 322-6 Oroshi-Cho, Toki-City, Gifu 509-5292, Japan
| | | |
Collapse
|
5
|
Igami H, Kubo S, Shimozuma T, Yoshimura Y, Notake T, Takahashi H, Idei H, Inagaki S, Tanaka H, Nagasaki K, Ohkubo K, Mutoh T. Research of Electron Cyclotron Resonance Heating Methods and Relevant Experiments. FUSION SCIENCE AND TECHNOLOGY 2010. [DOI: 10.13182/fst10-a10841] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Igami
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Notake
- Tera-Photonics Laboratory, RIKEN, Sendai 980-0845, Japan
| | - H. Takahashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - S. Inagaki
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - H. Tanaka
- Graduate School of Energy Science, Kyoto University, Kyoto 606-8502, Japan
| | - K. Nagasaki
- Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | | |
Collapse
|
6
|
Shiraiwa S, Hanada K, Hasegawa M, Idei H, Kasahara H, Mitarai O, Nakamura K, Nishino N, Nozato H, Sakamoto M, Sasaki K, Sato K, Takase Y, Yamada T, Zushi H. Heating by an electron Bernstein wave in a spherical tokamak plasma via mode conversion. PHYSICAL REVIEW LETTERS 2006; 96:185003. [PMID: 16712369 DOI: 10.1103/physrevlett.96.185003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Indexed: 05/09/2023]
Abstract
The first successful high power heating of a high dielectric constant spherical tokamak plasma by an electron Bernstein wave (EBW) is reported. An EBW was excited by mode conversion (MC) of an mode cyclotron wave injected from the low magnetic field side of the TST-2 spherical tokamak. Evidence of electron heating was observed as increases in the stored energy and soft x-ray emission. The increased emission was concentrated in the plasma core region. A heating efficiency of over 50% was achieved, when the density gradient in the MC region was sufficiently steep.
Collapse
Affiliation(s)
- S Shiraiwa
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa 277-8561, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Jones B, Efthimion PC, Taylor G, Munsat T, Wilson JR, Hosea JC, Kaita R, Majeski R, Maingi R, Shiraiwa S, Spaleta J, Ram AK. Controlled optimization of mode conversion from electron Bernstein waves to extraordinary mode in magnetized plasma. PHYSICAL REVIEW LETTERS 2003; 90:165001. [PMID: 12731979 DOI: 10.1103/physrevlett.90.165001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2002] [Indexed: 05/24/2023]
Abstract
In the CDX-U spherical torus, agreement between radiation temperature and Thomson scattering electron temperature profiles indicates approximately 100% conversion of thermally emitted electron Bernstein waves to the X mode. This has been achieved by controlling the electron density scale length (L(n)) in the conversion region with a local limiter outside the last closed flux surface, shortening L(n) to the theoretically required value for optimal conversion. From symmetry of the conversion process, prospects for efficient coupling in heating and current drive scenarios are strongly supported.
Collapse
Affiliation(s)
- B Jones
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Laqua HP, Maassberg H, Marushchenko NB, Volpe F, Weller A, Kasparek W. Electron-Bernstein-wave current drive in an overdense plasma at the Wendelstein 7-AS stellarator. PHYSICAL REVIEW LETTERS 2003; 90:075003. [PMID: 12633236 DOI: 10.1103/physrevlett.90.075003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2002] [Indexed: 05/24/2023]
Abstract
Electron-Bernstein-wave (EBW) current drive in an overdense plasma was demonstrated at the Wendelstein 7-AS stellarator for the first time. The EBWs were generated by O-X-B mode conversion. The relatively high current drive efficiency was consistent with theoretical predictions. The experiments provided first investigations of EBW phase space interaction for wave refractive indices much larger than unity.
Collapse
Affiliation(s)
- H P Laqua
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-17491 Greifswald, Germany
| | | | | | | | | | | |
Collapse
|
9
|
Shevchenko V, Baranov Y, O'Brien M, Saveliev A. Generation of noninductive current by electron-Bernstein waves on the COMPASS-D Tokamak. PHYSICAL REVIEW LETTERS 2002; 89:265005. [PMID: 12484831 DOI: 10.1103/physrevlett.89.265005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2002] [Revised: 10/07/2002] [Indexed: 05/24/2023]
Abstract
Electron-Bernstein waves (EBW) were excited in the plasma by mode converted extraordinary (X) waves launched from the high field side of the COMPASS-D tokamak at different toroidal angles. It has been found experimentally that X-mode injection perpendicular to the magnetic field provides maximum heating efficiency. Noninductive currents of up to 100 kA were found to be driven by the EBW mode with countercurrent drive. These results are consistent with ray tracing and quasilinear Fokker-Planck simulations.
Collapse
Affiliation(s)
- V Shevchenko
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, United Kingdom
| | | | | | | |
Collapse
|