Evaluation of Edge Electron Temperature Fluctuations Using a Conditional Technique on TST-2

Jun'ichi OZAKI; Masateru SONEHARA; Yoshihiko NAGASHIMA; Yuichi TAKASE; Akira EJIRI; Kotaro YAMADA; Hidetoshi KAKUDA; Shigeru INAGAKI; Takuya OOSAKO; Byung Il AN; Hiroyuki HAYASHI; Kentaro HANASHIMA; Junichi HIRATSUKA; Hiroaki KOBAYASHI; Hiroki KURASHINA; Takuya SAKAMOTO; Takashi YAMAGUCHI; Osamu WATANABE; Takuma WAKATSUKI

doi:10.1585/pfr.5.023

Rapid Communications

Evaluation of Edge Electron Temperature Fluctuations Using a Conditional Technique on TST-2

Jun'ichi OZAKI, Masateru SONEHARA, Yoshihiko NAGASHIMA, Yuichi TAKASE, Akira EJIRI, Kotaro YAMADA, Hidetoshi KAKUDA, Shigeru INAGAKI, Takuya OOSAKO, Byung Il AN, Hiroyuki HAYASHI, Kentaro HANASHIMA, Junichi HIRATSUKA, Hiroaki KOBAYASHI, Hiroki KURASHINA, Takuya SAKAMOTO, Takashi YAMAGUCHI, Osamu WATANABE, Takuma WAKATSUKI

Author information

Jun'ichi OZAKI
Faculty of Science, The University of Tokyo, Tokyo 113-0033, Japan
Masateru SONEHARA
Faculty of Science, The University of Tokyo, Tokyo 113-0033, Japan
Yoshihiko NAGASHIMA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Yuichi TAKASE
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Akira EJIRI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Kotaro YAMADA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Hidetoshi KAKUDA
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Shigeru INAGAKI
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
Takuya OOSAKO
CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
Byung Il AN
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Hiroyuki HAYASHI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Kentaro HANASHIMA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Junichi HIRATSUKA
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Hiroaki KOBAYASHI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Hiroki KURASHINA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Takuya SAKAMOTO
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Takashi YAMAGUCHI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Osamu WATANABE
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Takuma WAKATSUKI
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan

Keywords: electron temperature fluctuation, edge plasma, spherical tokamak, Langmuir probe

JOURNAL FREE ACCESS

2010 Volume 5 Pages 023

DOI https://doi.org/10.1585/pfr.5.023

Details

Abstract

The amplitudes of electron temperature fluctuations are evaluated in the edge plasma of TST-2 using a new technique. Langmuir probe current-voltage characteristic curves are conditionally reconstituted in terms of the magnitude of the floating potential. High/low electron temperatures are obtained in low/high floating-potential phases. The relationship between the electron temperature fluctuations and the time-averaged electron temperature gradient is discussed.

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