[Table of Contents]

Plasma and Fusion Research

Volume 2, S1057 (2007)

Regular Articles

Behavior of Hydrogen Fueled by Pellet Injection in the GAMMA 10 Tandem Mirror
Yuusuke KUBOTA, Masayuki YOSHIKAWA, Yousuke NAKASHIMA, Takayuki KOBAYASHI, Yuta HIGASHIZONO, Ken MATAMA, Masamitsu NOTO and Teruji CHO
Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
(Received 5 December 2006 / Accepted 4 June 2007 / Published 20 November 2007)

Abstract

In the GAMMA 10 tandem mirror, the pellet injection system is installed near the mid-plane of the central cell to improve plasma parameters and to study the pellet-plasma interactions in an open system. In recent experiments, hydrogen pellets are injected with ECRH at the plug/barrier and central cells. Consequently, increases in electron densities and Hα line emission with three peaks are observed. The radial profiles of Hα line emission at the peak time have a peak in the peripheral region of the injection side. These results show that the pellet cracks into three small pieces somewhere of the injection path. In this discharge, the pellet of the third peak penetrates deeper than the pellet of first peak, although the third pellet smaller than the first pellet. This phenomenon is occurred by the decrease of the ion temperature caused by the first and second pellet.

Keywords

hydrogen pellet, penetration depth, NGS model, fueled particle, Hα line emission, tandem mirror

DOI: 10.1585/pfr.2.S1057

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This paper may be cited as follows:

Yuusuke KUBOTA, Masayuki YOSHIKAWA, Yousuke NAKASHIMA, Takayuki KOBAYASHI, Yuta HIGASHIZONO, Ken MATAMA, Masamitsu NOTO and Teruji CHO, Plasma Fusion Res. 2, S1057 (2007).