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Takechi, Manabu; Fujita, Takaaki; Ishii, Yasutomo; Ozeki, Takahisa; Suzuki, Takahiro; Isayama, Akihiko; JT-60 Team
Nuclear Fusion, 45(12), p.1694 - 1699, 2005/12
Times Cited Count：7 Percentile：24.58(Physics, Fluids & Plasmas)High performance reversed shear discharges with strong internal transport barrier (ITB) and flat pressure profile in the plasma core region disrupt frequently even with low beta. We analyzed MHD instabilities leading to low beta disruption with measuring fluctuations and current profile with MSE measurement. We mainly observed two type of disruptions. One is the disruption without precursor at 
. The other is the disruption with n=1 precursor of 
100 ms. To explain these characteristics of disruption, we introduce the simple model such as, disruption occurs when the both MHD instabilities at plasma surface and at safety factor being equal to surface mode are unstable. This simple model can explain almost all observed disruption by two process. One is the surface mode triggered disruption, which occurs when qeff change, corresponding q surface at ITB layer changes discretely. The other is the internal mode triggered disruption, which occurs when corresponding q surface become unstable gradually.
Oikawa, Toshihiro
JAERI-Research 2003-028, 134 Pages, 2004/01
JAERI-Research-2003-028.pdf:7.73MB
The negative ion based neutral beam (N-NB) driven current density was determined over a wide range of electron temperatures. Theoretical prediction of the NB current drive increasing with beam energy and electron temperature was validated. A record value of NB current drive efficiency was achieved simultaneously with high confinement and high beta at a plasma current of 1.5 MA under a full current drive condition. The experimental validation of NB current drive theory gives greater confidence in predicting the NB current drive in future reactors. However, it was also found that MHD instabilities caused a degradation of NB current drive. A beam-driven instability expelled N-NB fast ions carrying non-inductive current from the central region. The lost N-NB driven current was estimated to be 7 % of the total N-NB driven current. For the neoclassical tearing mode (NTM), comparisons of the measurements with transport code calculations revealed that the loss of fast ions increases with the NTM activity and that fast ions at higher energies suffer larger transport than at lower energies.
Nagasaki, Kazunobu*; Isayama, Akihiko; Ide, Shunsuke; JT-60 Team
Nuclear Fusion, 43(10), p.L7 - L10, 2003/10
Times Cited Count：48 Percentile：79.54(Physics, Fluids & Plasmas)no abstracts in English
Kishimoto, Hiroshi; Shirai, Hiroshi
Proceedings of 3rd International Sakharov Conference on Physics, p.185 - 200, 2003/00
no abstracts in English
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：46 Percentile：77.72(Physics, Fluids & Plasmas)no abstracts in English
Nagashima, Keisuke; Kikuchi, Mitsuru; ; Ozeki, Takahisa; Aoyagi, Tetsuo; Ushigusa, Kenkichi; Neyatani, Yuzuru; Kubo, Hirotaka; Mori, Katsuharu*; *; et al.
Fusion Engineering and Design, 36(2-3), p.325 - 342, 1997/00
no abstracts in English
Shirai, Hiroshi; Shimizu, Katsuhiro; Takizuka, Tomonori; Hirayama, Toshio; Azumi, Masafumi
JAERI-Research 95-079, 43 Pages, 1995/11
JAERI-Research-95-079.pdf:1.71MB
no abstracts in English
Kamada, Yutaka; Sato, Masayasu; Kikuchi, Mitsuru; Mori, Masahiro
JAERI-Research 94-011, 17 Pages, 1994/08
JAERI-Research-94-011.pdf:0.98MB
no abstracts in English
Hoshino, Katsumichi; Mori, Masahiro; Yamamoto, Takumi; Tamai, Hiroshi; Shoji, Teruaki; Miura, Yukitoshi; ; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; et al.
Radio Frequency Power in Plasmas; AIP Conf. Proceedings 289, p.149 - 156, 1994/00
no abstracts in English
JAERI-M 9704, 78 Pages, 1981/10
no abstracts in English
; ; ; ; ;
Journal of the Physical Society of Japan, 48(1), p.273 - 278, 1980/00
Times Cited Count：0 Percentile：0.01(Physics, Multidisciplinary)no abstracts in English
