Plasma and Fusion Research

Volume 11, 2402053 (2016)

Regular Articles

Effect of Laval Nozzle in the GAMMA 10 SMBI Experiments
Md. Maidul ISLAM, Yousuke NAKASHIMA, Shinji KOBAYASHI1), Nobuhiro NISHINO2), Yuichiro NAKANO1), Katsuhiro HOSOI, Kazuya ICHIMURA, Md. Shahinul ISLAM, Keita SHIMIZU, Kazuma FUKUI, Masato OHUCHI, Akihiro TERAKADO, Masayuki YOSHIKAWA, Junko KOHAGURA, Mafumi HIRATA, Ryuya IKEZOE, Xiaolong WANG, Makoto ICHIMURA, Mizuki SAKAMOTO and Tsuyoshi IMAI
Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
1)
Institute of Advanced Energy, Kyoto University, Gokasyo, Uji 611-0011, Japan
2)
Graduate School of Engineering, Hiroshima University, Hiroshima 739-8527, Japan
(Received 30 November 2015 / Accepted 3 March 2016 / Published 22 April 2016)

Abstract

Gas fueling by supersonic molecular beam injection (SMBI) has been performed at the central-cell in GAMMA 10. The results of SMBI experiment with plenum pressure from 0.3 MPa to 2.0 MPa were obtained using a laval nozzle. The distribution of the emission intensity during SMBI was investigated by the 2-dimensional image captured by the fast camera as an index of the neutral transport. The experimental results indicates that the effect of the laval nozzle reduces the dispersion of injected hydrogen molecules in the peripheral region. In this paper, we also studied the line density at the central-cell (NLcc) and Hα emission intensity during SMBI. Comparison between SMBI and conventional gas puffing is also discussed from the view point of the fueling efficiency.

Keywords

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

DOI: 10.1585/pfr.11.2402053

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