Microstructure and Retention in He-W Co-Deposition Layer

Kosuke ASAI; Naoaki YOSHIDA; Noriyasu OHNO; Shin KAJITA; Hirohiko TANAKA; Miyuki YAJIMA; Daisuke NAGATA

doi:10.1585/pfr.15.1201004

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Microstructure and Retention in He-W Co-Deposition Layer

Kosuke ASAI, Naoaki YOSHIDA, Noriyasu OHNO, Shin KAJITA, Hirohiko TANAKA, Miyuki YAJIMA, Daisuke NAGATA

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

JOURNAL FREE ACCESS

2020 Volume 15 Pages 1201004

DOI https://doi.org/10.1585/pfr.15.1201004

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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.

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