[Table of Contents]

Plasma and Fusion Research

Volume 5, 023 (2010)

Rapid Communications

Evaluation of Edge Electron Temperature Fluctuations Using a Conditional Technique on TST-2
Jun'ichi OZAKI, Masateru SONEHARA, Yoshihiko NAGASHIMA1), Yuichi TAKASE1), Akira EJIRI1), Kotaro YAMADA1), Hidetoshi KAKUDA2), Shigeru INAGAKI3), Takuya OOSAKO4), Byung Il AN2), Hiroyuki HAYASHI1), Kentaro HANASHIMA1), Junichi HIRATSUKA2), Hiroaki KOBAYASHI1), Hiroki KURASHINA1), Takuya SAKAMOTO1), Takashi YAMAGUCHI1), Osamu WATANABE1) and Takuma WAKATSUKI2)
Faculty of Science, The University of Tokyo, Tokyo 113-0033, Japan
1)
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
2)
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
3)
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
4)
CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
(Received 25 February 2010 / Accepted 1 May 2010 / Published 28 June 2010)

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.

Keywords

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

DOI: 10.1585/pfr.5.023

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References

  • [1] J. Boedo et al., Rev. Sci. Instrum. 70, 2997 (1999).
  • [2] D. Rudakov et al., Rev. Sci. Instrum. 75, 4334 (2004).
  • [3] G. Tynan et al., Plasma Phys. Control. Fusion 51, 113001 (2009).
  • [4] S. Inagaki et al., In Proceedings of 24th Annual meetings of Japan Society of Plasma Science and Nuclear Fusion Research, Egret Himeji, Hyogo, Japan, 2007, 28aB14P (in Japanese).
  • [5] Y. Takase et al., Nucl. Fusion 41, 1543 (2001).

This paper may be cited as follows:

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 and Takuma WAKATSUKI, Plasma Fusion Res. 5, 023 (2010).