[Table of Contents]

Plasma and Fusion Research

Volume 8, 2402065 (2013)

Regular Articles

Bi-Directional Hydrogen Permeation through F82H under DEMO-Relevant Conditions
Haishan ZHOU, Yoshi HIROOKA1), Naoko ASHIKAWA1), Takeo MUROGA1) and Akio SAGARA1)
Department of Fusion Science, The Graduate University for Advanced Studies, Toki 509-5292, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan
(Received 9 December 2012 / Accepted 1 April 2013 / Published 19 June 2013)

Abstract

Using a laboratory-scale plasma device, plasma-driven and gas-driven permeation of hydrogen through a ferritic steel alloy: F82H has been investigated under some of the DEMO-relevant conditions. The steady state plasma-driven permeation flux has been found to be strongly affected by the variation in upstream surface morphology resulted from plasma bombardment. The activation energy of permeability for gas-driven permeation has been estimated to be ∼ 0.5 eV, which is close to the result of plasma-driven permeation. Gas-driven permeation can occur in the opposite direction of plasma-driven permeation, which then results in an increase in first wall recycling.

Keywords

plasma-driven permeation, gas-driven permeation, reduced activation ferritic steel, first wall, hydrogen plasma, Force-Free Helical Reactor

DOI: 10.1585/pfr.8.2402065

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This paper may be cited as follows:

Haishan ZHOU, Yoshi HIROOKA, Naoko ASHIKAWA, Takeo MUROGA and Akio SAGARA, Plasma Fusion Res. 8, 2402065 (2013).