[Table of Contents]

Plasma and Fusion Research

Volume 5, S1032 (2010)

Regular Articles

Investigation of the Clustering Condition for Various Gasses Ejected from a Fast Solenoid Valve for Supersonic Cluster Beam Injection
Akiyoshi MURAKAMI, Junichi MIYAZAWA1), Hayato TSUCHIYA1), Tomohiro MORISAKI1), Nari TSUTAGAWA2), Yoshiro NARUSHIMA1), Ryuichi SAKAMOTO1) and Hiroshi YAMADA1)
The Graduate University for Advanced Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
(Received 7 May 2009 / Accepted 21 June 2009 / Published 26 March 2010)


The supersonic cluster beam (SSCB) injection method is being developed as a new fueling method for the Large Helical Devise (LHD) experiment. As a first step, cluster formation at a room temperature has been investigated for various gasses using a fast solenoid valve for SSCB. Rayleigh scattering of laser light by the cluster is measured by a fast charge coupled device camera. In the case of methane, nitrogen, and argon, clear scattering signals are observed at high valve backing pressure of more than 3-4 MPa. In the case of hydrogen, helium, and neon, on the other hand, no scattering signal is detected at < 8 MPa. The result that the expansion half angle is 22.5° suggests gas flow is supersonic. The scattering signals from argon and nitrogen clusters show approximately cubic dependence on the backing pressure as expected from a model. Meanwhile, stronger pressure dependence than this has been found in the case of methane, where the scattering signal increases with the fifth power of the backing pressure at 3.2 MPa-7 MPa, and it is further enhanced at > 7 MPa.


fueling method, gas puffing, solenoid valve, cluster, Rayleigh scattering

DOI: 10.1585/pfr.5.S1032


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This paper may be cited as follows:

Akiyoshi MURAKAMI, Junichi MIYAZAWA, Hayato TSUCHIYA, Tomohiro MORISAKI, Nari TSUTAGAWA, Yoshiro NARUSHIMA, Ryuichi SAKAMOTO and Hiroshi YAMADA, Plasma Fusion Res. 5, S1032 (2010).