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Kuriyama M, Akino N, Ebisawa N, Grisham L, Honda A, Itoh T, Kawai M, Kazawa M, Mogaki K, Ohara Y, Ohga T, Okumura Y, Oohara H, Umeda N, Usui K, Watanabe K, Yamamoto M, Yamamoto T. Operation and Development of the 500-keV Negative-Ion-Based Neutral Beam Injection System for JT-60U. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst02-a237] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Kuriyama
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - N. Akino
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - N. Ebisawa
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - L. Grisham
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - A. Honda
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - T. Itoh
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - M. Kawai
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - M. Kazawa
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - K. Mogaki
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - Y. Ohara
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - T. Ohga
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - Y. Okumura
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - H. Oohara
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - N. Umeda
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - K. Usui
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - K. Watanabe
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - M. Yamamoto
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
| | - T. Yamamoto
- Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801-1 Mukohyama Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
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Yoshida M, Hanada M, Kojima A, Kashiwagi M, Grisham LR, Akino N, Endo Y, Komata M, Mogaki K, Nemoto S, Ohzeki M, Seki N, Sasaki S, Shimizu T, Terunuma Y. Improvement of uniformity of the negative ion beams by tent-shaped magnetic field in the JT-60 negative ion source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02B314. [PMID: 24593591 DOI: 10.1063/1.4830365] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Non-uniformity of the negative ion beams in the JT-60 negative ion source with the world-largest ion extraction area was improved by modifying the magnetic filter in the source from the plasma grid (PG) filter to a tent-shaped filter. The magnetic design via electron trajectory calculation showed that the tent-shaped filter was expected to suppress the localization of the primary electrons emitted from the filaments and created uniform plasma with positive ions and atoms of the parent particles for the negative ions. By modifying the magnetic filter to the tent-shaped filter, the uniformity defined as the deviation from the averaged beam intensity was reduced from 14% of the PG filter to ∼10% without a reduction of the negative ion production.
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Affiliation(s)
- Masafumi Yoshida
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Masaya Hanada
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Atsushi Kojima
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Mieko Kashiwagi
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Larry R Grisham
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - Noboru Akino
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Yasuei Endo
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Masao Komata
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Kazuhiko Mogaki
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Shuji Nemoto
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Masahiro Ohzeki
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Norikazu Seki
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Shunichi Sasaki
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Tatsuo Shimizu
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - Yuto Terunuma
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
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Oohara W, Fukumasa O. Hydrogen atomic pair-ion production on catalyst surface. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:023507. [PMID: 20192495 DOI: 10.1063/1.3314902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
To generate a hydrogen pair-ion plasma consisting of only hydrogen atomic pair ions, i.e., H(+) and H(-) ions, the efficient production of pair ions is required. When discharged hydrogen plasma is irradiated to a Ni catalyst, pair ions are produced on the catalyst surface. It is clarified that hydrogen chemisorption on the catalyst affects pair-ion production.
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Affiliation(s)
- W Oohara
- Department of Electrical and Electronic Engineering, Yamaguchi University, Ube 755-8611, Japan
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Hu L, Kuriyama M, Akino N, Ebisawa N, Honda A, Itoh T, Kawai M, Kazawa M, Kusaka M, Mogaki K, Ohga T, Ohmori K, Ohshima K, Okumura Y, Oohara H, Satoh F, Seki H, Tanai Y, Toyokawa Y, Usui K, Watanabe K, Yamaguchi M, Yamazaki H, Yamazaki T. Beam divergence and power loading on the beamline components of the negative-ion based NBI system for JT-60U. FUSION ENGINEERING AND DESIGN 2001. [DOI: 10.1016/s0920-3796(00)00544-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Itoh T, Akino N, Aoyagi T, Ebisawa N, Honda A, Inoue T, Isozaki N, Kawai M, Kazawa M, Koizumi J, Kuriyama M, Mogaki K, Ohara Y, Ohga T, Okumura Y, Oohara H, Ooshima K, Satoh F, Seki H, Toyokawa R, Takenouchi T, Usui K, Watanabe K, Yamazaki T, Yamamoto M. Beamline performance of 500 keV negative ion-based NBI system for JT-60U. FUSION ENGINEERING AND DESIGN 1998. [DOI: 10.1016/s0920-3796(97)00185-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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