[Table of Contents]

Plasma and Fusion Research

Volume 6, 2404070 (2011)

Regular Articles

Mechanical Issues of FIREX Target under Cryogenic Environment
Akifumi IWAMOTO, Takeshi FUJIMURA1), Atsushi SUNAHARA2), Hitoshi SAKAGAMI and Takayoshi NORIMATSU1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
1)
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
2)
Institute for Laser Technology, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
(Received 7 December 2010 / Accepted 22 March 2011 / Published 1 July 2011)

Abstract

A typical FIREX target is assembled with a 500 µm diameter PS shell, a glass fill tube and a gold cone guide. Each part is glued together by an epoxy resin. To date, several assembled targets have been cooled down to cryogenic environment. However, they could not survive a cool down process and appeared to rupture around the glued boundary between the PS shell and cone guide. To reveal a crucial factor of the target destruction, its thermal stress after cool down was calculated using the ANSYS code. A two dimensional axisymmetric calculation model is composed of the PS shell and cone guide glued by an epoxy resin which is covered on by an epoxy fillet. A cool down process from 293 K to 10 K was simulated. The calculation showed that the rupture of the shell would start from the PS shell and gold cone guide boundary and the target validity depended on how the epoxy fillet could reinforce the PS shell.

Keywords

mechanical issue of FIREX target, PS shell, epoxy gluing, cryogenic environment, thermal contraction, thermal stress, ANSYS code

DOI: 10.1585/pfr.6.2404070

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This paper may be cited as follows:

Akifumi IWAMOTO, Takeshi FUJIMURA, Atsushi SUNAHARA, Hitoshi SAKAGAMI and Takayoshi NORIMATSU, Plasma Fusion Res. 6, 2404070 (2011).