Effect of Laval Nozzle in the GAMMA 10 SMBI Experiments

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...

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Veröffentlicht in:	Plasma and Fusion Research 2016/04/22, Vol.11, pp.2402053-2402053
Hauptverfasser:	ISLAM, Md. Maidul, NAKASHIMA, Yousuke, KOBAYASHI, Shinji, NISHINO, Nobuhiro, NAKANO, Yuichiro, HOSOI, Katsuhiro, ICHIMURA, Kazuya, ISLAM, Md. Shahinul, SHIMIZU, Keita, FUKUI, Kazuma, OHUCHI, Masato, TERAKADO, Akihiro, YOSHIKAWA, Masayuki, KOHAGURA, Junko, HIRATA, Mafumi, IKEZOE, Ryuya, WANG, Xiaolong, ICHIMURA, Makoto, SAKAMOTO, Mizuki, IMAI, Tsuyoshi
Format:	Artikel
Sprache:	eng
Schlagworte:	Beam injection Emission analysis GAMMA 10 H alpha line high-speed camera Laval nozzle Nozzles supersonic molecular beam injection
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Zusammenfassung:	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.
ISSN:	1880-6821 1880-6821
DOI:	10.1585/pfr.11.2402053