Plasma and Fusion Research

Volume 15, 1201004 (2020)

Rapid Communications

Microstructure and Retention in He-W Co-Deposition Layer
Kosuke ASAI, Naoaki YOSHIDA1), Noriyasu OHNO, Shin KAJITA2), Hirohiko TANAKA, Miyuki YAJIMA3) and Daisuke NAGATA3)
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
1)
RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga-shi, Fukuoka 816-8580, Japan
2)
IMaSS, Nagoya University, Nagoya 464-8603, Japan
3)
National Institute for Fusion Science, Oroshi-cho, Toki, Gifu 509-5292, Japan
(Received 9 December 2019 / Accepted 5 January 2020 / Published 17 February 2020)

Abstract

A tungsten (W) deposition layer is formed while a sample is exposed to a helium (He) plasma at the surface temperature of 473 or 573 K. The formed He-W co-deposition layer was composed of fine grains, the size of which increased with the surface temperature. The samples with the co-deposition layer was exposed to a deuterium (D2) plasma, and the D retention was investigated using thermal desorption spectroscopy. It was found that the co-deposition layer has quite different D retention characteristics compared with bulk W.

Keywords

He-W co-deposition, plasma-material interactions, Co-NAGDIS

DOI: 10.1585/pfr.15.1201004

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