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Journal Articles

Long pulse operation of high performance plasmas in JT-60U

Ide, Shunsuke; JT-60 Team

Plasma Science and Technology, 8(1), p.1 - 4, 2006/01

 Times Cited Count:0 Percentile:0.01(Physics, Fluids & Plasmas)

Recent progress in development of high performance plasma and efforts to prolong their sustainment towards ITER advanced operations and a steady-state reactor in JT-60U are presented focusing following achievements; $$beta$$N=3 sustained for 6.2s ($$sim$$4.1tR) without NTMs in normal shear, fBS$$sim$$0.45 sustained for 5.8s ($$sim$$2.8tR) under nearly full CD in weak a shear plasma, fBS$$sim$$0.75 sustained for 7.4s (2.7tR) under nearly full CD in a reversed shear plasma. Furthermore, importance of these results and issues in advanced tokamak development will be discussed.

Journal Articles

Energetic ion transport by abrupt large-amplitude event induced by negative-ion-based neutral beam injection in the JT-60U

Ishikawa, Masao; Takechi, Manabu; Shinohara, Koji; Kusama, Yoshinori; Cheng, C. Z.*; Matsunaga, Go; Todo, Yasushi*; Gorelenkov, N. N.*; Kramer, G. J.*; Nazikian, R. M.*; et al.

Nuclear Fusion, 45(12), p.1474 - 1480, 2005/12

 Times Cited Count:37 Percentile:76.55(Physics, Fluids & Plasmas)

To investigate energetic ion transport induced by Alfven eigenmodes (AEs) the neutron emission profile measurement and the charge exchange (CX) neutral particle flux measurement by Natural Diamond Detector has been performed simultaneously in the JT-60U for the first time. The energetic ion profiles inferred from these measurements indicate that ALEs cause a radial redistribution of energetic ions of limited energy range from the core region to the outer region of the plasma in weak shear plasmas. This energy range is consistent with the resonance condition between the mode and the energetic ions. In reversed shear plasmas, reversed-shear-induced AEs (RSAEs) and their transition to TAEs as the minimum value of the safety factor decreases has been observed. Neutron measurements suggest energetic ion loss is large in the transition phase from RSAEs to TAEs.

Journal Articles

Kinetic reversed-shear Alfv$'e$n eigenmodes

Konovalov, S. V.; Mikhailovskii, A. B.*; Shirokov, M. S.*; Kovalishen, E. A.*; Ozeki, Takahisa

Physics of Plasmas, 11(9), p.4531 - 4534, 2004/09

 Times Cited Count:19 Percentile:55.85(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Development of theory of reversed-shear alfven eigenmodes in tokamaks

Konovalov, S. V.; Mikhailovskii, A.*; Kovalishen, E.*; Ozeki, Takahisa; Takizuka, Tomonori; Shirokov, M. S.*

Proceedings of 20th IAEA Fusion Energy Conference (FEC 2004) (CD-ROM), 8 Pages, 2004/00

Alfven eigenmodes in tokamaks with reversed magnetic shear are studied theoretically by incorporating into the mode description the effects known theories of Global, Kinetic and Toroidal Alfven Eigenmodes. In particular mode forming effect due to thermal plasma density gradient is examined. Criteria of the fast ion density and its gradient on the existence of a localized solution of the eigenmode equation is softened by this effect. Effects of finite Larmor radius, continuum damping and fast ion density gradient are also studied.

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

Results of ITER physics R&D, 6; Physics of energetic particles

Tobita, Kenji; Fukuyama, Atsushi*

Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.138 - 144, 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

JT-60U high performance regimes

Ishida, Shinichi; JT-60 Team

Nuclear Fusion, 39(9Y), p.1211 - 1226, 1999/09

 Times Cited Count:38 Percentile:75.67(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Recent progress in high performance and steady-state experiments on the Japan Atomic Energy Research Institute tokamak-60 upgrade with W-shaped divertor

Kusama, Yoshinori; JT-60 Team

Physics of Plasmas, 6(5), p.1935 - 1942, 1999/05

 Times Cited Count:17 Percentile:52.18(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Experimental studies on Alfven eigenmodes in tokamaks and critical issues

Kusama, Yoshinori; Kimura, Haruyuki

Purazuma, Kaku Yugo Gakkai-Shi, 75(5), p.525 - 536, 1999/05

no abstracts in English

Journal Articles

ITER physics basis, 5; Physics of energetic ions

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

Nuclear Fusion, 39(12), p.2471 - 2494, 1999/00

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

Noncircular triangularity and ellipticity-induced Alfven eigenmodes observed in JT-60U

Kramer, G. J.*; Saigusa, Mikio; Ozeki, Takahisa; Kusama, Yoshinori; Kimura, Haruyuki; Oikawa, Toshihiro; G.Y.Fu*; C.Z.Cheng*; Tobita, Kenji

Physical Review Letters, 80(12), p.2594 - 2597, 1998/03

 Times Cited Count:41 Percentile:83.29(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Systematic study of toroidicity-induced Alfven eigenmodes at low-q discharges in JT-60U

Saigusa, Mikio; Kimura, Haruyuki; Kusama, Yoshinori; Kramer, G. J.*; Ozeki, Takahisa; Moriyama, Shinichi; Oikawa, Toshihiro; Neyatani, Yuzuru; Kondoh, Takashi

Plasma Physics and Controlled Fusion, 40(9), p.1647 - 1659, 1998/00

 Times Cited Count:33 Percentile:72.14(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

The Determination of the q-profile in the plasma core from Alfven eigenmodes

Kramer, G. J.*; Oikawa, Toshihiro; Fujita, Takaaki; Kamada, Yutaka; Kusama, Yoshinori; Tobita, Kenji; Ozeki, Takahisa; C.Z.Cheng*; Nazikian, R.*

Plasma Physics and Controlled Fusion, 40(6), p.863 - 869, 1998/00

 Times Cited Count:13 Percentile:47.17(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Physics issues of high bootstrap current tokamaks

Ozeki, Takahisa; Azumi, Masafumi; Ishii, Yasutomo; Kishimoto, Yasuaki; G.Y.Fu*; Fujita, Takaaki; G.Rewoldt*; Kikuchi, Mitsuru; Kamada, Yutaka; Ide, Shunsuke; et al.

Plasma Physics and Controlled Fusion, 39(5A), p.A371 - A380, 1997/05

no abstracts in English

Journal Articles

ICRF heating and TAE modes in reactor relevant JT-60U discharges

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

Fusion Energy 1996, Vol.3, p.295 - 305, 1997/00

no abstracts in English

Journal Articles

Triton burnup measurements using scintillating fiber detectors on JT-60U

Nishitani, Takeo; Isobe, Mitsutaka*; G.A.Wurden*; R.E.Chrien*; Tobita, Kenji; Kusama, Yoshinori; Harano, Hideki*

Fusion Engineering and Design, 34-35, p.563 - 566, 1997/00

 Times Cited Count:16 Percentile:77.16(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Effect of shear in toroidal rotation on toroidicity induced Alfven eigenmodes

Saigusa, Mikio; Kusama, Yoshinori; Ozeki, Takahisa; Kimura, Haruyuki; Fujita, Takaaki; Moriyama, Shinichi; Fujii, Tsuneyuki; Azumi, Masafumi; Afanassiev, V. I.*; Neyatani, Yuzuru; et al.

Nuclear Fusion, 37(11), p.1559 - 1568, 1997/00

 Times Cited Count:14 Percentile:47.2(Physics, Fluids & Plasmas)

no abstracts in English

36 (Records 1-20 displayed on this page)