Plasma and Fusion Research

Volume 7, 2402126 (2012)

Regular Articles

Analysis of Neutral Transport in GAMMA 10 SMBI Experiments

Katsuhiro HOSOI, Yousuke NAKASHIMA, Shinji KOBAYSHI¹⁾, Nobuhiro NISHINO²⁾, Tohru MIZUUCHI¹⁾, Takashi ISHII, Kazuya ICHIMURA, Hisato TAKEDA, Hideaki UEDA, Satoru KIGURE, Shigehito TAKAHASHI, Satoru HOTAKA and Tsuyoshi IMAI

: Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
1): Institute of Advance Energy, Kyoto University, Uji 611-0011, Japan
2): Grauate School of Engineering, Hiroshima University, Higashihiroshima 739-8527, Japan

(Received 9 December 2011 / Accepted 6 July 2012 / Published 13 September 2012)

Abstract

Results of supersonic molecular beam injection (SMBI) into GAMMA 10 are described. By analyzing the two-dimensional image of the emission captured by a high-speed camera, we investigated neutral transport during SMBI. The experimental results show that the degree of diffusion of the injected neutral particles decreases with increasing plenum pressure. By applying a three-dimensional Monte-Carlo simulation to GAMMA 10, we analyze the neutral-particle transport. The simulation given under the initial conditions of the conventional gas puffing could not reproduce the experimental results. Compared with experimental results, the results of simulation were too diffusive. The experimental SMBI results were roughly reproduced under more squeezed divergence angle of injected particles than that of a cosine distribution. These results reveal a difference between divergence angles for particles launched via SMBI and via conventional gas puffing.

Keywords

GAMMA 10, supersonic molecular beam injection, DEGAS, Hα, high-speed camera

DOI: 10.1585/pfr.7.2402126

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This paper may be cited as follows:

Katsuhiro HOSOI, Yousuke NAKASHIMA, Shinji KOBAYSHI, Nobuhiro NISHINO, Tohru MIZUUCHI, Takashi ISHII, Kazuya ICHIMURA, Hisato TAKEDA, Hideaki UEDA, Satoru KIGURE, Shigehito TAKAHASHI, Satoru HOTAKA and Tsuyoshi IMAI, Plasma Fusion Res. 7, 2402126 (2012).