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Isobe M, Kim J, Zhang Y, Chang J, Ogawa K, Kim JY, Liu Y, Hu L. Recent Advances of Scintillator-Based Escaping Fast Ion Diagnostics in Toroidal Fusion Plasmas in Japan, Korea, and China. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.1080/15361055.2017.1291044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Mitsutaka Isobe
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Toki 509-5292, Japan
| | - Junghee Kim
- National Fusion Research Institute, Daejeon 34133, Korea
- Korea University of Science and Technology, Daejeon 34133, Korea
| | - Yipo Zhang
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Jiafeng Chang
- Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, China
| | - Kunihiro Ogawa
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Toki 509-5292, Japan
| | - Jun Young Kim
- Korea University of Science and Technology, Daejeon 34133, Korea
| | - Yi Liu
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Liqun Hu
- Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, China
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Pace D, Van Zeeland M, Fishler B, Murphy C. Consideration of neutral beam prompt loss in the design of a tokamak helicon antenna. FUSION ENGINEERING AND DESIGN 2016. [DOI: 10.1016/j.fusengdes.2016.07.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shinohara K, Kim J, Kim JY, Rhee T. Evaluation of observable phase space by fast ion loss detector by calculating particle orbits in consideration of plasma facing components and three dimensional magnetic field. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11D804. [PMID: 27910607 DOI: 10.1063/1.4959877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The orbits of lost ions can be calculated from the information obtained by a fast ion loss detector (FILD). The orbits suggest a source of the lost fast ions in a phase space. However, it is not obvious whether an observable set of orbits, or phase space, of a FILD appropriately covers the region of interest to be investigated since the observable phase space can be affected by plasma facing components (PFCs) and a magnetic configuration. A tool has been developed to evaluate the observable phase space of FILD diagnostic by calculating particle orbits by taking the PFCs and 3D magnetic field into account.
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Affiliation(s)
- Kouji Shinohara
- National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - Junghee Kim
- National Fusion Research Institute, Daejeon, South Korea
| | - Jun Young Kim
- Korea University of Science and Technology, Daejeon, South Korea
| | - Tongnyeol Rhee
- National Fusion Research Institute, Daejeon, South Korea
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Bonofiglo PJ, Anderson JK, Almagri AF, Kim J, Clark J, Capecchi W, Sears SH, Egedal J. Development towards a fast ion loss detector for the reversed field pinch. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11D824. [PMID: 27910492 DOI: 10.1063/1.4959950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A fast ion loss detector has been constructed and implemented on the Madison Symmetric Torus (MST) to investigate energetic ion losses and transport due to energetic particle and MHD instabilities. The detector discriminates particle orbits solely on pitch and consists of two thin-foil, particle collecting plates that are symmetric with respect to the device aperture. One plate collects fast ion signal, while the second aids in the minimization of background and noise effects. Initial measurements are reported along with suggestions for the next design phase of the detector.
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Affiliation(s)
- P J Bonofiglo
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - J K Anderson
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - A F Almagri
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - J Kim
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - J Clark
- Florida Agricultural and Mechanical University, Tallahassee, Florida 32307, USA
| | - W Capecchi
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - S H Sears
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - J Egedal
- University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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Chen X, Heidbrink WW, Van Zeeland MA, Kramer GJ, Pace DC, Petty CC, Austin ME, Fisher RK, Hanson JM, Nazikian R, Zeng L. Using neutral beams as a light ion beam probe (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E701. [PMID: 25430364 DOI: 10.1063/1.4889733] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
By arranging the particle first banana orbits to pass near a distant detector, the light ion beam probe (LIBP) utilizes orbital deflection to probe internal fields and field fluctuations. The LIBP technique takes advantage of (1) the in situ, known source of fast ions created by beam-injected neutral particles that naturally ionize near the plasma edge and (2) various commonly available diagnostics as its detector. These born trapped particles can traverse the plasma core on their inner banana leg before returning to the plasma edge. Orbital displacements (the forces on fast ions) caused by internal instabilities or edge perturbing fields appear as modulated signal at an edge detector. Adjustments in the q-profile and plasma shape that determine the first orbit, as well as the relative position of the source and detector, enable studies under a wide variety of plasma conditions. This diagnostic technique can be used to probe the impact on fast ions of various instabilities, e.g., Alfvén eigenmodes (AEs) and neoclassical tearing modes, and of externally imposed 3D fields, e.g., magnetic perturbations. To date, displacements by AEs and by externally applied resonant magnetic perturbation fields have been measured using a fast ion loss detector. Comparisons with simulations are shown. In addition, nonlinear interactions between fast ions and independent AE waves are revealed by this technique.
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Affiliation(s)
- Xi Chen
- Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831, USA
| | - W W Heidbrink
- University of California Irvine, Irvine, California 92697, USA
| | - M A Van Zeeland
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - G J Kramer
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543, USA
| | - D C Pace
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - C C Petty
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - M E Austin
- University of Texas at Austin, Austin, Texas 78712, USA
| | - R K Fisher
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - J M Hanson
- Columbia University, New York, New York 10027, USA
| | - R Nazikian
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543, USA
| | - L Zeng
- University of California Los Angeles, Los Angeles, California 90095, USA
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