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

doi:10.1585/pfr.10.3402061

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

ENG - Quantum Science and Energy Engineering

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	1-4
Number of pages	4
Journal	Plasma and Fusion Research
Volume	10
DOIs	https://doi.org/10.1585/pfr.10.3402061
Publication status	Published - 2015

Keywords

electrode biasing
H-mode transition
heliotron
pulsation
stellarator
turbulent transport

ASJC Scopus subject areas

Condensed Matter Physics

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10.1585/pfr.10.3402061

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Shimizu, K., Kitajima, S., Okamoto, A., Sato, Y., Tachibana, J., Oku, T., Takayama, M., Sano, F., Mizuuchi, T., Nagasaki, K., Okada, H., Kado, S., Kobayashi, S., Yamamoto, S., Ohshima, S., Suzuki, Y., Yokoyama, M., & Takahashi, H. (2015). Observation of Intermittent Transition by Electrode Biasing in Heliotron J*). Plasma and Fusion Research, 10, 1-4. https://doi.org/10.1585/pfr.10.3402061

Observation of Intermittent Transition by Electrode Biasing in Heliotron J*). / Shimizu, Kosuke; Kitajima, Sumio; Okamoto, Atsushi; Sato, Yu; Tachibana, Jo; Oku, Toshihiro; Takayama, Masakazu; Sano, Fumimichi; Mizuuchi, Tohru; Nagasaki, Kazunobu; Okada, Hiroyuki; Kado, Shinichiro; Kobayashi, Shinji; Yamamoto, Satoshi; Ohshima, Shinsuke; Suzuki, Yasuhiro; Yokoyama, Masayuki; Takahashi, Hiromi.

In: Plasma and Fusion Research, Vol. 10, 2015, p. 1-4.

Research output: Contribution to journal › Article › peer-review

Shimizu, K, Kitajima, S, Okamoto, A, Sato, Y, Tachibana, J, Oku, T, Takayama, M, Sano, F, Mizuuchi, T, Nagasaki, K, Okada, H, Kado, S, Kobayashi, S, Yamamoto, S, Ohshima, S, Suzuki, Y, Yokoyama, M & Takahashi, H 2015, 'Observation of Intermittent Transition by Electrode Biasing in Heliotron J*)', Plasma and Fusion Research, vol. 10, pp. 1-4. https://doi.org/10.1585/pfr.10.3402061

Shimizu, Kosuke ; Kitajima, Sumio ; Okamoto, Atsushi ; Sato, Yu ; Tachibana, Jo ; Oku, Toshihiro ; Takayama, Masakazu ; Sano, Fumimichi ; Mizuuchi, Tohru ; Nagasaki, Kazunobu ; Okada, Hiroyuki ; Kado, Shinichiro ; Kobayashi, Shinji ; Yamamoto, Satoshi ; Ohshima, Shinsuke ; Suzuki, Yasuhiro ; Yokoyama, Masayuki ; Takahashi, Hiromi. / Observation of Intermittent Transition by Electrode Biasing in Heliotron J*). In: Plasma and Fusion Research. 2015 ; Vol. 10. pp. 1-4.

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title = "Observation of Intermittent Transition by Electrode Biasing in Heliotron J*)",

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.",

keywords = "electrode biasing, H-mode transition, heliotron, pulsation, stellarator, turbulent transport",

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

note = "Funding Information: This work was performed with the support and under the auspices of the NIFS Collaboration Research Program (NIFS14KUHL063) and was partly supported by JSPS KAKENHI Grant Number 24246152. Publisher Copyright: {\textcopyright} 2015 The Japan Society of Plasma Science and Nuclear Fusion Research",

year = "2015",

doi = "10.1585/pfr.10.3402061",

language = "English",

volume = "10",

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journal = "Plasma and Fusion Research",

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publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

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T1 - Observation of Intermittent Transition by Electrode Biasing in Heliotron J*)

AU - Shimizu, Kosuke

AU - Kitajima, Sumio

AU - Okamoto, Atsushi

AU - Sato, Yu

AU - Tachibana, Jo

AU - Oku, Toshihiro

AU - Takayama, Masakazu

AU - Sano, Fumimichi

AU - Mizuuchi, Tohru

AU - Nagasaki, Kazunobu

AU - Okada, Hiroyuki

AU - Kado, Shinichiro

AU - Kobayashi, Shinji

AU - Yamamoto, Satoshi

AU - Ohshima, Shinsuke

AU - Suzuki, Yasuhiro

AU - Yokoyama, Masayuki

AU - Takahashi, Hiromi

N1 - Funding Information: This work was performed with the support and under the auspices of the NIFS Collaboration Research Program (NIFS14KUHL063) and was partly supported by JSPS KAKENHI Grant Number 24246152. Publisher Copyright: © 2015 The Japan Society of Plasma Science and Nuclear Fusion Research

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - electrode biasing

KW - H-mode transition

KW - heliotron

KW - pulsation

KW - stellarator

KW - turbulent transport

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DO - 10.1585/pfr.10.3402061

M3 - Article

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VL - 10

SP - 1

EP - 4

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

SN - 1880-6821

ER -

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

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