Speaker
Mr
Shinsuke OHSHIMA
(Japan)
Description
Nonlinear behavior of broad-band fluctuation and dynamical potential change, associated with beam-driven MHD phenomenon, are observed around edge region in a medium-sized helical device, Heliotron J. Nonlinear phase relationship between the MHD and broad-band fluctuation is demonstrated as a result of bicoherence and envelope analyses applied to floating potential signals measured with multiple Langmuir probes (LPs) in neutral beam injection (NBI) heated plasmas. Also, structural potential profile change synchronized with the cyclic MHD burst is discovered. These experimental observations suggest that such MHD fluctuations can have influence on the confinement property of bulk plasma through nonlinear process and/or change of electric field structure.
Country or International Organization of Primary Author
Japan
Primary author
Mr
Shinsuke OHSHIMA
(Japan)
Co-authors
Prof.
Fumimichi SANO
(Institute of Advanced Energy, Kyoto University)
Dr
Hiroyuki OKADA
(Institute of Advanced Energy, Kyoto University)
Mr
Hyun Yong LEE
(Graduate School of Energy Science, Kyoto University, Gokasho)
Prof.
Kazunobu Nagasaki
(Institute of Advanced Energy, Kyoto University)
Dr
Kiyofumi MUKAI
(National Institute for Fusion Science)
Dr
Kiyoshi HANATANI
(Institute of Advanced Energy, Kyoto University)
Mr
Kohei HASHIMOTO
(Graduate School of Energy Science, Kyoto University)
Mr
Linge Zang
(Graduate School of Energy Science, Kyoto University)
Dr
Masaki TAKEUCHI
(Japan Atomic Energy Agency)
Dr
Satoshi Yamamoto
(Institute of Advanced Energy, Kyoto University)
Dr
Shigeru KONOSHIMA
(Institute of Advanced Energy, Kyoto University)
Dr
Shinji KOBAYASHI
(Institute of Advanced Energy, Kyoto University)
Dr
Takashi MINAMI
(Institute of Advanced Energy, Kyoto University,)
Prof.
Tohru MIZUUCHI
(Institute of Advanced Energy, Kyoto University)
