[Table of Contents]

Plasma and Fusion Research

Volume 2, S1089 (2007)

Regular Articles

Electron Current Measurement of Helical Nonneutral Plasmas for Investigating Plasma Disruption Observed in CHS Experiments
H. HIMURA, Y. YAMAMOTO, A. SANPEI, S. MASAMUNE, M. ISOBE1), S. OKAMURA1) and K. MATSUOKA1)
Kyoto Institute of Technology, Department of Electronics, Matsugasaki, Kyoto 606-8585, Japan
1)
National Institute for Fusion Sciences, Toki, Gifu 509-5292, Japan
(Received 4 December 2006 / Accepted 25 March 2007 / Published 20 November 2007)

Abstract

A nonneutral plasma confined on helical magnetic surfaces exhibits instability, although it is theoretically stable. In order to investigate the disruptive phenomenon in detail, electron particle flow into a probe tip is carefully measured inside the magnetic surfaces. Preliminary results indicate that the observed disruption is first to occur near the top of the plasma, and then, seems to propagate toward the center of the plasma.

Keywords

helical nonneutral plasma, magnetic surface confinement, disruption of nonneutral plasma, electrostatic probe measurement

DOI: 10.1585/pfr.2.S1089

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References

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This paper may be cited as follows:

H. HIMURA, Y. YAMAMOTO, A. SANPEI, S. MASAMUNE, M. ISOBE, S. OKAMURA and K. MATSUOKA, Plasma Fusion Res. 2, S1089 (2007).