[Table of Contents]

Plasma and Fusion Research

Volume 9, 3405041 (2014)

Regular Articles

First Wall Particle Flux Measurements by an F82H Permeation Probe in QUEST
Haishan ZHOU, Yoshi HIROOKA1), Hideki ZUSHI2), Arseniy KUZMIN2) and the QUEST group2)
The Graduate University for Advanced Studies, Toki, Gifu 509-5292, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
2)
RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
(Received 10 December 2013 / Accepted 7 March 2014 / Published 7 May 2014)

Abstract

First wall particle flux measurements in the QUEST spherical tokamak have been conducted, using a permeation probe that employs a first wall candidate ferritic steel alloy F82H as the membrane and also SUS304 as a comparative reference membrane. Permeation measurements have been done during the conditioning steady-state discharges heated with 2.45 GHz and 8.2 GHz ECR. Diffusion and recombination coefficients measured in a laboratory-scale plasma device: VEHICLE-1 are used to interpret the results from the permeation probe measurements in QUEST. These permeation membranes have been analyzed with XPS to evaluate the effects of surface impurities.

Keywords

plasma-driven permeation, QUEST, reduced activation ferritic steel, stainless steel, first wall, hydrogen plasma

DOI: 10.1585/pfr.9.3405041

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This paper may be cited as follows:

Haishan ZHOU, Yoshi HIROOKA, Hideki ZUSHI, Arseniy KUZMIN and the QUEST group, Plasma Fusion Res. 9, 3405041 (2014).