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Journal Articles

Geodesic-acoustic-mode in JFT-2M tokamak plasmas

Ido, Takeshi*; Miura, Yukitoshi; Kamiya, Kensaku; Hamada, Yasuji*; Hoshino, Katsumichi; Fujisawa, Akihide*; Ito, Kimitaka*; Ito, Sanae*; Nishizawa, Akimitsu*; Ogawa, Hiroaki; et al.

Plasma Physics and Controlled Fusion, 48(4), p.S41 - S50, 2006/04

 Times Cited Count:119 Percentile:96.8(Physics, Fluids & Plasmas)

The potential and density fluctuations of Geodesic-Acoustic-Mode (GAM) were investigated through the direct and simultaneous measurement of electrostatic and density fluctuations with a heavy ion beam probe(HIBP). It was found that the amplitude of the fluctuation has a maximum inside of the plasma boundary and that it has an almost constant frequency. It was also found that the mode propagates in the radial direction and that the GAM affects the background turbulence. The influence to the background turbulence was found to be in consistent with a theoretical prediction.

Journal Articles

Generation of radial electric field induced by collisionless internal kink mode with density gradient

Matsumoto, Taro; Tokuda, Shinji; Kishimoto, Yasuaki; Naito, Hiroshi*

Physics of Plasmas, 10(1), p.195 - 203, 2003/01

 Times Cited Count:5 Percentile:17.84(Physics, Fluids & Plasmas)

Effects of density gradient on the collisionless m=1 internal kink mode in a cylindrical tokamak plasma are studied by the gyro-kinetic particle simulations. When the density gradient is not large enough to change the full reconnection process, the phenomena after the full reconnection, such as the secondary reconnection and the evolution of the safety factor profile, are changed considerably due to the self-generated radial electric field, i.e. the m=0 mode. The growing mechanism is explained by the difference of $$Etimes B$$ drift motion between ions and electrons, which is caused by the fast parallel motion of electron. Once the radial electric field is triggered by the symmetrical flow induced by the m=1 mode, the m=0 mode grows up to the same level as the m=1 mode, and drives an $$Etimes B$$ plasma rotation in the ion diamagnetic direction, which breaks the symmetrical plasma flow induced by the m=1 mode. The density and current distributions, and minimum safety factor after the full reconnection, are found to be affected by the asymmetrical flow driven by the m=1 and m=0 modes.

Journal Articles

Multichannel motional stark effect diagnostic discriminating radial electric field in the JFT-2M tokamak

Kamiya, Kensaku; Kimura, Haruyuki; Hoshino, Katsumichi; Isei, Nobuaki; Kawashima, Hisato; Ogawa, Hiroaki; Ogawa, Toshihide; Tsuzuki, Kazuhiro; Uehara, Kazuya; JFT-2M Group

Review of Scientific Instruments, 72(7), p.2931 - 2935, 2001/07

 Times Cited Count:6 Percentile:41.2(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

The Multichannel motional stark effect diagnostic system in the JFT-2M tokamak

Kamiya, Kensaku; Miura, Yukitoshi

JAERI-Tech 2000-090, 17 Pages, 2001/02

JAERI-Tech-2000-090.pdf:0.97MB

no abstracts in English

Journal Articles

Multichordal charge exchange recombination spectroscopy on the JT-60U tokamak

Koide, Yoshihiko; Sakasai, Akira; Sakamoto, Yoshiteru; Kubo, Hirotaka; Sugie, Tatsuo

Review of Scientific Instruments, 72(1), p.119 - 127, 2001/01

 Times Cited Count:37 Percentile:84.49(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Gyro-kinetic particle simulation of m=1 internal kink mode in the presence of density gradient

Matsumoto, Taro; Tokuda, Shinji; Kishimoto, Yasuaki; Takizuka, Tomonori; Naito, Hiroshi*

Purazuma, Kaku Yugo Gakkai-Shi, 75(10), P. 1194, 1999/10

no abstracts in English

Journal Articles

Complex behavior of internal collapse due to self-generated radial electric field

Matsumoto, Taro; Tokuda, Shinji; Kishimoto, Yasuaki; Takizuka, Tomonori; Naito, Hiroshi*

Journal of Plasma and Fusion Research SERIES, Vol.2, p.97 - 100, 1999/00

no abstracts in English

Journal Articles

Formation of edge transport barrier

Miura, Yukitoshi

Purazuma, Kaku Yugo Gakkai-Shi, 74(9), p.968 - 976, 1998/09

no abstracts in English

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