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Journal Articles

Escaping fast ion diagnostics for the fast particle transport analysis

Isobe, Mitsutaka*; Shinohara, Koji

Purazuma, Kaku Yugo Gakkai-Shi, 80(12), p.1036 - 1043, 2004/12

Escaping energetic ion diagnostics in magnetically confined plasma experiments are described in this lecture note. Experimental results from escaping energetic ion diagnostics in TFTR, JFT-2M, CHS and W7-AS are shown. In addition to mechanism of energetic ion loss from a viewpoint of particle orbit, effect of MHD activity on energetic particle transport is reviewed.

Journal Articles

Energetic particle experiments in JT-60U and their implications for a fusion reactor

Tobita, Kenji; Kusama, Yoshinori; Shinohara, Koji; Nishitani, Takeo; Kimura, Haruyuki; Kramer, G. J.*; Nemoto, Masahiro*; Kondoh, Takashi; Oikawa, Toshihiro; Morioka, Atsuhiko; et al.

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.315 - 326, 2002/09

 Times Cited Count:8 Percentile:49.76(Nuclear Science & Technology)

Energetic particle experiments in JT-60U are summarized, mainly covering ripple loss and Alfven eigenmodes (AE modes). Significant loss was observed for 85 keV NBI ions and fusion-produced tritons increased when toroidal field ripple at the plasma surface, especially in reversed shear plasma. Measurement of hot spots on the first wall due to ripple loss confirmed agreement with code predictions, validating the modeling incorporated in an orbit-following Monte Carlo code. A variety of AE modes were destabilized in ICRF minority heating and negative-ion-based NBI (N-NBI) heating. Most of the observed modes are gap modes identified to be TAE, EAE and NAE. Interesting finding is pulsating modes accompanying frequency sweep, which were destabilized by N-NBI and sometimes induced a beam ion loss of up to 25%. Also presented are energetic particle issues in auxiliary heating with ICRF and N-NBI.

Journal Articles

Research and development on the Ion Cyclotron Range of Frequency heating system in JT-60U

Moriyama, Shinichi; Fujii, Tsuneyuki; Kimura, Haruyuki; Anno, Katsuto; Yokokura, Kenji; Shinozaki, Shinichi; Terakado, Masayuki; Hiranai, Shinichi; Saigusa, Mikio*

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.467 - 481, 2002/09

 Times Cited Count:5 Percentile:35.97(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Simulation of $$^{3}$$He minority Ion Cyclotron Range of Frequency (ICRF) Heating in International Thermonuclear Experimental Reactor (ITER)

Matsumoto, Hiroshi

Japanese Journal of Applied Physics, Part 2, 40(11A), p.L1187 - L1189, 2001/11

 Times Cited Count:0 Percentile:0(Physics, Applied)

$$^{3}$$He minority ICRF Heating in ITER was simulated by the 1.5 D tokamak simulation code PRETOR and ICRF heating simulation code PION. It was found that the best heating efficiency in terms of the fusion power output is achieved with the smallest miority concentration ratio、0.5%, when the fuel dilution effect by the minority ions was taken into account. The overall heating efficiency is insensitive to the location of the resonance layer over a wide range of the minor radius position. Very efficient heating of the ITER plasma with $$^{3}$$He minority ICRF heating by spreading the RF depostion at three resonant locations was demonstarted by the PRETOR/PION simulation. In the Q=10 reference operation regime, ICRF is better than NBI by 8%, better than pure electron heating by 20%. In the low density region, ICRF is better than NBI by 15%, and better than electron heating by 50%.

Journal Articles

Magnetic safety factor profile before and after sawtooth crashes investigated with toroidicity and ellipticity induced Alfv$'e$n eigenmodes

Kramer, G. J.; Cheng, C. Z.*; Kusama, Yoshinori; Nazikian, R. M.*; Takeji, Satoru; Tobita, Kenji

Nuclear Fusion, 41(9), p.1135 - 1151, 2001/09

 Times Cited Count:32 Percentile:70.38(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

High-voltage test of feedthroughs for a high-power ICRF antenna

Fujii, Tsuneyuki; Moriyama, Shinichi

IEEE Transactions on Plasma Science, 29(2), p.318 - 325, 2001/04

 Times Cited Count:3 Percentile:11.53(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Fast particle experiments in JT-60U

Kramer, G. J.; Iwase, Makoto; Kusama, Yoshinori; Morioka, Atsuhiko; Nemoto, Masahiro; Nishitani, Takeo; Shinohara, Koji; Takeji, Satoru; Tobita, Kenji; Ozeki, Takahisa; et al.

Nuclear Fusion, 40(7), p.1383 - 1396, 2000/07

 Times Cited Count:44 Percentile:78.44(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Results of ITER physics R&D, 5; Physics of heating and current drive

Fukuyama, Atsushi*; Takase, Yuichi*; Ide, Shunsuke; Ushigusa, Kenkichi

Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.127 - 137, 2000/02

no abstracts in English

Journal Articles

Frequency chirping of core-localized toroidicity-induced Alfv$'e$n eigenmodes and their coupling to global Alfv$'e$n eigenmodes

Kramer, G. J.; Cheng, C. Z.*; Fu, G. Y.*; Kusama, Yoshinori; Nazikian, R. M.*; Ozeki, Takahisa; Tobita, Kenji

Physical Review Letters, 83(15), p.2961 - 2964, 1999/10

 Times Cited Count:22 Percentile:74.7(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

ICRF heating of plasmas with internal transport barrier during reversed magnetic shear experiments in JT-60U

Iwase, Makoto; Koide, Yoshihiko; Tobita, Kenji; Moriyama, Shinichi; Takenaga, Hidenobu; Fujita, Takaaki; Shirai, Hiroshi; Kusama, Yoshinori; Nemoto, Masahiro; Oikawa, Toshihiro; et al.

Proc. of 13th Topical Conf. on Applications of Radio Frequency Power to Plasmas, p.116 - 119, 1999/04

no abstracts in English

Journal Articles

High-power test of the all-metal supports for a center conductor of an ITER ICRF antenna

Moriyama, Shinichi; Kimura, Haruyuki; Fujii, Tsuneyuki; Saigusa, Mikio*; Imai, Tsuyoshi; Yamamoto, Takumi; Arai, H.*; Ota, K.*

Fusion Engineering and Design, 45(1), p.31 - 40, 1999/00

 Times Cited Count:2 Percentile:21.95(Nuclear Science & Technology)

no abstracts in English

Journal Articles

ITER physics basis, 6; Plasma auxiliary heating and current drive

ITER Physics Expert Group on Energetic Particles, Heating and Current Drive

Nuclear Fusion, 39(12), p.2495 - 2539, 1999/00

no abstracts in English

Journal Articles

Production and confinement characteristics of ICRF-accelerated energetic ions in JT-60U negative-shear plasmas

Kusama, Yoshinori; Kimura, Haruyuki; Nemoto, Masahiro; Hamamatsu, Kiyotaka; Tobita, Kenji; Oikawa, Toshihiro; Afanassiev, V. I.*; Morioka, Atsuhiko; Fujita, Takaaki; Koide, Yoshihiko; et al.

Plasma Physics and Controlled Fusion, 41(5), p.625 - 643, 1999/00

 Times Cited Count:5 Percentile:20.82(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Destabilization of ellipticity-induced Alfven eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U

Kusama, Yoshinori; Fu, G. Y.*; Kramer, G. J.*; Saigusa, Mikio*; Oikawa, Toshihiro; Ozeki, Takahisa; Moriyama, Shinichi; Tchernychev, F. V.*; Nemoto, Masahiro; Kondoh, Takashi; et al.

Plasma Physics and Controlled Fusion, 41(9), p.1167 - 1177, 1999/00

 Times Cited Count:5 Percentile:20.82(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Latest plasma performance and experiments on JT-60U

Tobita, Kenji; JT-60 Team

Plasma Physics and Controlled Fusion, 41(SUPPL.3A), p.A333 - A343, 1999/00

 Times Cited Count:28 Percentile:66.8(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Development of all-metal antenna for ICRF system in next generation tokamaks

Moriyama, Shinichi; Fujii, Tsuneyuki; Kimura, Haruyuki; Arai, Hiroyuki*; Ota, K.*

Proceedings of the 18th IEEE/NPSS Symposium on Fusion Engineering (SOFE '99), p.399 - 402, 1999/00

no abstracts in English

Journal Articles

Real-time impedance matching by frequency feedback control in Ion Cyclotron Range of frequency heating experiments in JT-60U and future tokamaks

Moriyama, Shinichi; Kimura, Haruyuki; Fujii, Tsuneyuki; Yamamoto, Takumi; Saigusa, Mikio*

Japanese Journal of Applied Physics, Part 1, 37(11), p.6204 - 6209, 1998/11

 Times Cited Count:2 Percentile:13.92(Physics, Applied)

no abstracts in English

Journal Articles

Alfven eigenmode and energetic particle research in JT-60U

Kimura, Haruyuki; Kusama, Yoshinori; Saigusa, Mikio*; Kramer, G. J.*; Tobita, Kenji; Nemoto, Masahiro; Kondoh, Takashi; Nishitani, Takeo; O.DaCosta*; Ozeki, Takahisa; et al.

Nuclear Fusion, 38(9), p.1303 - 1314, 1998/09

 Times Cited Count:112 Percentile:94.81(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Toroidal alfven eigenmodes driven with ICRF accelerated protons in JT-60U negative shear discharges

Kusama, Yoshinori; Kimura, Haruyuki; Ozeki, Takahisa; Saigusa, Mikio*; Kramer, G. J.*; Oikawa, Toshihiro; Moriyama, Shinichi; Nemoto, Masahiro; Fujita, Takaaki; Tobita, Kenji; et al.

Nuclear Fusion, 38(8), p.1215 - 1223, 1998/08

 Times Cited Count:39 Percentile:76.79(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

A Mock-up test of a ceramic-free antenna feeder of the ion cyclotron heating system for next-generation tokamaks

Moriyama, Shinichi; Kimura, Haruyuki; Fujii, Tsuneyuki; Saigusa, Mikio*; Arai, H.*

Japanese Journal of Applied Physics, 37(6A), p.3536 - 3540, 1998/06

 Times Cited Count:4 Percentile:24.47(Physics, Applied)

no abstracts in English

110 (Records 1-20 displayed on this page)