[Table of Contents]

Plasma and Fusion Research

Volume 5, S2010 (2010)

Regular Articles

Study of Fluctuation Suppression during Potential Formation in the Tandem Mirror GAMMA 10
Masayuki YOSHIKAWA, Yoshiaki MIYATA, Masanori MIZUGUCHI, Neo IMAI, Hitoshi HOJO, Makoto ICHIMURA, Tsuyoshi KARIYA, Isao KATANUMA, Yousuke NAKASHIMA, Ryutaro MINAMI, Hiroyuki SHIDARA, Yuusuke YAMAGUCHI, Yoriko SHIMA, Youhei OONO, Fumiaki YAGUCHI and Tsuyoshi IMAI
Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
(Received 5 December 2009 / Accepted 13 May 2010 / Published 10 December 2010)

Abstract

In the tandem mirror GAMMA 10, plasma confinement is achieved by not only a magnetic mirror configuration but also high potentials in both end regions. Before plug electron cyclotron resonance heating (P-ECH) was applied, drift-type fluctuations were observed in potential and density measurements. Potential and density fluctuation suppression during potential formation by the application of P-ECH was clearly observed using a gold neutral beam probe (GNBP) system. We study the relationship between the suppression levels of potential fluctuations and the effects of the produced potentials by varying the applied ECH power. Moreover, the particle-flux-related values obtained by the phase difference between the potential and density fluctuations are measured using the GNBP. We can clearly show that radial anomalous transport induces radial particle transport, which decreases the plasma stored energy.

Keywords

Tandem mirror GAMMA 10, gold neutral beam probe, potential, electric field, fluctuation

DOI: 10.1585/pfr.5.S2010

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This paper may be cited as follows:

Masayuki YOSHIKAWA, Yoshiaki MIYATA, Masanori MIZUGUCHI, Neo IMAI, Hitoshi HOJO, Makoto ICHIMURA, Tsuyoshi KARIYA, Isao KATANUMA, Yousuke NAKASHIMA, Ryutaro MINAMI, Hiroyuki SHIDARA, Yuusuke YAMAGUCHI, Yoriko SHIMA, Youhei OONO, Fumiaki YAGUCHI and Tsuyoshi IMAI, Plasma Fusion Res. 5, S2010 (2010).