Observation of Intermittent Transition by Electrode Biasing in Heliotron J*)

Kosuke Shimizu, Sumio Kitajima, Atsushi Okamoto, Yu Sato, Jo Tachibana, Toshihiro Oku, Masakazu Takayama, Fumimichi Sano, Tohru Mizuuchi, Kazunobu Nagasaki, Hiroyuki Okada, Shinichiro Kado, Shinji Kobayashi, Satoshi Yamamoto, Shinsuke Ohshima, Yasuhiro Suzuki, Masayuki Yokoyama, Hiromi Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

We observed intermittent increases in the electrode current in electrode biasing experiments in Heliotron J. In addition, electron density and floating potential showed pulsating behavior associated with the electrode current. The relation between line density and electrode current and that between floating potential and electrode current showed a hysteresis feature in transitions. Then it is evident that the pulsating behavior was the intermittent transition between two distinctive states. We also observed the mode (~10 kHz) that accompanied the pulsating behavior in the power spectrum density of the floating potential and ion saturation current obtained via fast Fourier transform. The electron density gradient increased, and subsequently the power spectrum density of the fluctuation increased.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalPlasma and Fusion Research
Volume10
DOIs
Publication statusPublished - 2015

Keywords

  • electrode biasing
  • H-mode transition
  • heliotron
  • pulsation
  • stellarator
  • turbulent transport

ASJC Scopus subject areas

  • Condensed Matter Physics

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