Speaker
Dr
Shinsuke OHSHIMA
(Institute of Advanced Energy, Kyoto University)
Description
The hydrogen/deuterium (H/D) isotope effects for long range correlation (LRC) and the nonlinear relationship with turbulence were observed for the first time in a helical device, Heliotron J. The fluctuation amplitude and the correlation in toroidal direction in the low frequency range < 4 kHz are enhanced as the D2 gas becomes dominant during the shot-to-shot experiment. Turbulence scale size increases as D2 gas is dominated in the discharge, which is consistent with the conventional turbulence theories and the past experimental works [1,2]. Nonlinear coupling between the LRC and turbulence, which should relate to the generation of the LRC, is also enhanced along with the increase in the LRC. This observation gives an implication that the isotope effects on the confinement improvement and/or on the threshold in L-H transition are dominated by the increase of nonlinear coupling on turbulence and the resultant enhancement of the zonal flow activity in D plasmas.
| Country or International Organization | Japan |
|---|---|
| Paper Number | EX/P8-20 |
Primary author
Dr
Shinsuke OHSHIMA
(Institute of Advanced Energy, Kyoto University)
Co-authors
Dr
Gavin Weir
(Institute of Advanced Energy, Kyoto university)
Dr
Hiroyuki Okada
(Institute of Advanced Energy, Kyoto University)
Prof.
Kazunobu Nagasaki
(Institute of Advanced Energy, Kyoto University)
Mr
Makoto Motoshima
(Graduate School of Energy Science, Kyoto University)
Mr
Naoki Kenmochi
(Institute of Advanced Energy, Kyoto university)
Dr
Satoshi Yamamoto
(Institute of Advanced Energy, Kyoto University)
Dr
Shigeru KONOSHIMA
(Institute of Advanced Energy, Kyoto university)
Dr
Shinichiro KADO
(Institute of Advanced Energy, Kyoto university)
Dr
Shinji Kobayashi
(Institute of Advanced Energy, Kyoto Univ.)
Dr
Takashi Minami
(Institute of Advanced Energy, Kyoto University)
Dr
Tohru MIZUUCHI
(Institute of Advanced Energy, Kyoto University)
Mr
X Lu
(Graduate School of Energy Science, Kyoto University)
Mr
Yoshiaki Ohtani
(Graduate School of Energy Science, Kyoto University)
