Plasma and Fusion Research

Volume 17, 2405062 (2022)

Regular Articles

Effect of Deuterium Fluence on Deuterium Retention in Tungsten with Fibrous Nanostructured Layer in a Compact Plasma Device APSEDAS
Takahisa SAKAI, Dogyun HWANGBO, Naoki ORIKASA, Mikoto KUSUMOTO, Katsutomo TAKATSU, Haru YOSHIDA, Aoi FUJIMORI, Ryusei NITTA and Mizuki SAKAMOTO
Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
(Received 10 January 2022 / Accepted 29 March 2022 / Published 6 June 2022)

Abstract

The formation of helium (He) induced “fuzz layer” significantly changes the deuterium (D) retention in tungsten (W). In this study, the D retention in W with an identical fuzz layer is investigated using thermal desorption spectroscopy, with various D ion fluences. It is found that the D retention substantially decreases by ∼80% at relatively low fluence of ∼1024 D/m2, and ∼40% at the higher fluence of 6 × 1025 D/m2. A new broad desorption peak at ∼650 K appearing at the higher D ion fluences of >1025 D/m2 originates from the interior of the fuzz layer, not the W bulk space. This suggests that the fuzz layer can force D ions to stay near the surface of W regardless of the D ion fluence, working as a diffusion barrier of hydrogen isotope fuels.

Keywords

helium, fuzz, deuterium retention, tungsten, diffusion barrier

DOI: 10.1585/pfr.17.2405062

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