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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

1)

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

2)

Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan

(Received 7 May 2009 / Accepted 21 June 2009 / Published 26 March 2010)

Abstract

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.

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

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).