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Hydrogen Permeation through Sputter-Deposited Tungsten Coated F82H in QUEST

Yue XU¹⁾, Arseniy KUZMIN²⁾, Yoshi HIROOKA^1,3), Kazuaki HANADA²⁾, Naoko ASHIKAWA^1,3) and the QUEST group²⁾

1)

The Graduate University for Advanced Studies, 322-6 Oroshi, Toki, Gifu 509-5292, Japan

2)

Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka 812-8580, Japan

3)

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

(Received 20 April 2017 / Accepted 14 August 2017 / Published 13 September 2017)

Abstract

Hydrogen plasma-driven permeation (PDP) experiments have been performed using a sputter-deposited tungsten (SP-W) coated F82H membrane in the spherical tokamak QUEST. It has been found that SP-W coatings tend to enhance hydrogen PDP compared with that of bare F82H membrane. Surface recombination is a key process determining the PDP flux, suggesting that surface effects on hydrogen PDP should be further investigated.

Copyright (c) 2017 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

QUEST, first wall, F82H, tungsten coating, plasma-driven permeation

DOI: 10.1585/pfr.12.1305038

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References

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