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Electron Density Measurement by Using a Multi-Channel Interferometer System in the Tandem Mirror GAMMA 10

Masayuki YOSHIKAWA, Takatoshi MATSUMOTO, Yoriko SHIMA, Akinori NAKAHARA, Naoyuki YANAGI, Akiyosi ITAKURA, Hitoshi HOJO, Yuusuke KUBOTA, Takayuki KOBAYASHI, Yuta HIGASHIZONO, Yousuke NAKASHIMA, Yoshinori TATEMATSU, Tsuyoshi IMAI and Teruji CHO

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

(Received 1 December 2006 / Accepted 23 February 2007 / Published 20 November 2007)

Abstract

Fluctuation in the plasma is important to be measured for studying the improvement of the plasma confinement by the formation of the plasma confinement potential. Density fluctuation is observed using microwaves, such as interferometer, reflectometry and Fraunhofer diffraction method. We have constructed a new multi-channel microwave interferometer for measuring the plasma density and fluctuation radial profiles in a single plasma shot. In order to study higher density plasma operation, we have started sub-millimeter hydrogen ice pellet injection experiments into the potential confined plasma. We successfully measured the time dependent density and line-integrated density fluctuation radial profiles in the pellet injection experiments using the multi-channel microwave interferometer.

Copyright (c) 2007 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

multi-channel microwave interferometer, GAMMA 10, density profile, fluctuation, pellet injection

DOI: 10.1585/pfr.2.S1036

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References

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This paper may be cited as follows:

Masayuki YOSHIKAWA, Takatoshi MATSUMOTO, Yoriko SHIMA, Akinori NAKAHARA, Naoyuki YANAGI, Akiyosi ITAKURA, Hitoshi HOJO, Yuusuke KUBOTA, Takayuki KOBAYASHI, Yuta HIGASHIZONO, Yousuke NAKASHIMA, Yoshinori TATEMATSU, Tsuyoshi IMAI and Teruji CHO, Plasma Fusion Res. 2, S1036 (2007).