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First Results of Simultaneous Multipoint Plasma Potential Measurements Using a Gold Neutral Beam Probe

Yoshiaki MIYATA, Masayuki YOSHIKAWA, Mizuki SAKAMOTO, Masanori MIZUGUCHI, Fumiaki YAGUCHI, Masato AOYAMA, Yoshiaki TANEMURA and Tsuyoshi IMAI

Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577 Japan

(Received 18 April 2011 / Accepted 18 May 2011 / Published 24 June 2011)

Abstract

The physical mechanisms of the improvement of plasma confinement due to the formation of electrostatic potential and electric field were studied. A 12-keV gold neutral beam probe (GNBP) with the same capabilities as a heavy ion beam probe was operated on the GAMMA 10 tandem mirror. The simultaneous multipoint system was developed to measure the local electric field. The structure of the novel analyzer and the technique for measuring the local electric field were studied by using the calculation code of three-dimensional beam trajectory. It was possible for the first time to measure the local electric field in a single plasma shot by the simultaneous multipoint plasma potential measurement system using the GNBP in the GAMMA 10 tandem mirror.

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

gold neutral beam probe, simultaneous multipoint measurement, plasma potential measurement, electric field measurement

DOI: 10.1585/pfr.6.1202090

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This paper may be cited as follows:

Yoshiaki MIYATA, Masayuki YOSHIKAWA, Mizuki SAKAMOTO, Masanori MIZUGUCHI, Fumiaki YAGUCHI, Masato AOYAMA, Yoshiaki TANEMURA and Tsuyoshi IMAI, Plasma Fusion Res. 6, 1202090 (2011).