Influence of near-surface helium on the deuterium retention and uptake in tungsten

IF 2.7 2区物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Materials and Energy Pub Date : 2025-09-05 DOI:10.1016/j.nme.2025.101981

S. Markelj , T. Schwarz-Selinger , A. Šestan , J. Zavašnik , M. Kelemen

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Abstract

The effect of near-surface helium (He) on deuterium (D) retention and uptake into the bulk of tungsten (W) was investigated. To quantify the He influence on D uptake, He was implanted close to the surface with 3 keV energy at different fluences and different temperatures. 20 MeV W irradiation was performed at room temperature after He implantation to create defects within the first 2.3 µm. Samples were then exposed to a low flux, low energy (300 eV/D) D ion beam at 450 K. The defects created by W ions trap penetrating D and make it hence possible to quantify D transport into depth below the He layer using ³He nuclear reaction analysis. Elastic recoil detection analysis enabled us to measure the D and He concentration depth profiles near the surface. Results show that D gets preferentially retained where He is implanted with D concentrations up to 10 at.%. At the same time D uptake beyond the He zone is reduced by a factor of 15 compared to a He-free W sample.

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近表面氦对钨中氘保留和吸收的影响

研究了近表面氦（He）对氘(D)在钨(W)体中的保留和吸收的影响。为了量化He对D吸收的影响，在不同的影响和不同的温度下，以3 keV的能量在接近表面的地方注入He。He注入后在室温下进行20 MeV W辐照，在前2.3µm内形成缺陷。然后将样品暴露在450k低通量，低能量（300 eV/D）的D离子束中。W离子产生的缺陷捕获了穿透D，因此可以使用3He核反应分析来量化D向He层以下深度的输运。弹性反冲检测分析使我们能够测量地表附近的D和He浓度深度剖面。结果表明，当D浓度达到10% at.%时，He被优先保留。同时，与无He的W样品相比，He区以外的D吸收减少了15倍。

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来源期刊

Nuclear Materials and Energy Materials Science-Materials Science (miscellaneous)

CiteScore

3.70

自引率

15.40%

发文量

175

审稿时长

20 weeks

期刊介绍： The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.