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Journal Articles

Observation of the interaction between the geodesic acoustic mode and ambient fluctuation in the JFT-2M tokamak

Ido, Takeshi*; Miura, Yukitoshi; Hoshino, Katsumichi; Kamiya, Kensaku; Hamada, Yasuji*; Nishizawa, Akimitsu*; Kawasumi, Yoshiaki*; Ogawa, Hiroaki; Nagashima, Yoshihiko*; Shinohara, Koji; et al.

Nuclear Fusion, 46(5), p.512 - 520, 2006/05

 Times Cited Count:80 Percentile:93.3(Physics, Fluids & Plasmas)

The electrostatic fluctuation spectrum and the fluctuation-induced particle flux of the JFT-2M tokamak were estimated using the hevy ion beam probe (HIBP) measurement. A geodesic acoustic mode (GAM) of the frequency about15kHz was identified in the L-mode. The GAM has its peak at about 3cm inside of the separatrix with the electric field of about 1.4kV/m. The estimated turbulent particle flux is found to be intermittent. It is found that the density fluctuation is modulated by the GAM in the wide frequency range and the coherence analysis shows that the flucruation-induced particle flux is partially contributed by the GAM. In the H-mode the GAM disappears and the fluctuation and the flux is much decreased.The mechanism of the large burst-like flux in the L-mode is not understood yet and left as the future problem.

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

Plasma diagnostics in JFT-2M

Kasai, Satoshi*; Kamiya, Kensaku; Shinohara, Koji; Kawashima, Hisato; Ogawa, Hiroaki; Uehara, Kazuya; Miura, Yukitoshi; Okano, Fuminori; Suzuki, Sadaaki; Hoshino, Katsumichi; et al.

Fusion Science and Technology, 49(2), p.225 - 240, 2006/02

 Times Cited Count:3 Percentile:25.6(Nuclear Science & Technology)

The diagnostic system of JFT-2M has consisted of about 30 individual diagnostic instruments,which were used to study the plasma production, control, equilibrium, stability, confinement, plasma heating by NBI and/or RF (LH, ICRF, ECH) and current drive by RF. In these instruments, the motional Stark effect (MSE) polarimeter, charge exchanged recombination spectroscopy (CXRS), heavy-ion beam probe (HIBP), time of flight (TOF) neutral particle analyzer, etc. have contributed to make clear the improved mechanism of confinement such as H-mode and High Recycling Steady (HRS) H-mode, and to search the operational region of these modes.The infrared TV camera system and lost ion probe have played a very important role to investigate the heat load onto the walls due to ripple loss particles and escaping ions from core plasma, respectively.

Journal Articles

Calibration of heavy ion beam probe energy analyzer using mesh probe in the JFT-2M tokamak

Kamiya, Kensaku; Miura, Yukitoshi; Ido, Takeshi*; Hamada, Yasuji*

Review of Scientific Instruments, 74(9), p.4206 - 4208, 2003/09

 Times Cited Count:0 Percentile:0.01(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Relations among potential change, fluctuation change and transport barrier in the JFT-2M tokamak

Miura, Yukitoshi; Ido, Takeshi*; Kamiya, Kensaku; Hamada, Yasuji*; JFT-2M Group

Nuclear Fusion, 41(8), p.973 - 979, 2001/08

 Times Cited Count:16 Percentile:49.25(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Development of mesh probe for the calibration of the HIBP diagnostic system in the JFT-2M tokamak

Kamiya, Kensaku; Miura, Yukitoshi; Tsuzuki, Kazuhiro; Ido, Takeshi*; Hamada, Yasuji*; Nakayama, Takeshi*

Review of Scientific Instruments, 72(1), p.579 - 582, 2001/01

 Times Cited Count:2 Percentile:20.74(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Temporal behaviour of the potential and fluctuations at the L/H transition on JFT-2M

Ido, Tsuyoshi; Kamiya, Kensaku; Miura, Yukitoshi; Hamada, Yasuji*; Nishizawa, Akimitsu*; Kawasumi, Yoshiaki*

Plasma Physics and Controlled Fusion, 42(5A), p.A309 - A315, 2000/05

 Times Cited Count:17 Percentile:49.56(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Behavior of sample volumes of the heavy ion beam probe on JFT-2M

Ido, Tsuyoshi*; Kamiya, Kensaku*; Hamada, Y.*; Nishizawa, A.*; Kawasumi, Y.*; Miura, Yukitoshi

Plasma Physics and Controlled Fusion, 41(8), p.1013 - 1024, 1999/08

 Times Cited Count:10 Percentile:36.73(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Heavy ion beam probe diagnostic system on JFT-2M

Ido, Tsuyoshi*; Hamada, Y.*; *; Kawasumi, Y.*; Miura, Yukitoshi; Kamiya, Kensaku*

Review of Scientific Instruments, 70(1), p.955 - 958, 1999/01

 Times Cited Count:24 Percentile:80.28(Instruments & Instrumentation)

no abstracts in English

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