Plasma and Fusion Research

Volume 12, 1205009 (2017)

Rapid Communications


Hydrogen Isotopes Plasma-Driven Permeation through Tungsten Coated Reduced Activation Ferritic Steel F82H
Yue XU1), Yoshi HIROOKA1,2), Takuya NAGASAKA1,2) and Naoko ASHIKAWA1,2)
1)
The Graduate University for Advanced Studies, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
2)
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
(Received 10 January 2017 / Accepted 27 January 2017 / Published 3 March 2017)

Abstract

Hydrogen isotopes plasma-driven permeation (PDP) through F82H coated with two different types of tungsten coatings, i.e., sputter-deposited tungsten (SP-W) and vacuum plasma-sprayed tungsten (VPS-W) has been studied in the temperature range of 300 - 550 °C. It has been found that hydrogen isotopes PDP fluxes through VPS-W coated F82H are reduced compared to that through bare F82H. However, the PDP fluxes through SP-W coated F82H are enhanced compared to bare F82H. Reduced or enhanced PDP fluxes are related to the different microstructure of tungsten coatings and its surface recombination characteristics.


Keywords

first wall, tungsten coating, plasma-driven permeation, surface recombination, deuterium retention

DOI: 10.1585/pfr.12.1205009


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