渗透
等离子体
氢
分析化学(期刊)
离解(化学)
朗缪尔探针
同位素
等离子体参数
辐照
电离
动力学同位素效应
温度电子
材料科学
氦
化学
氘
原子物理学
离子
等离子体诊断
色谱法
膜
核物理学
物理化学
有机化学
物理
生物化学
作者
Yue Xu,Kai Yang,Yunfeng Xu,Laima Luo,Junjie Ni,Yucheng Wu
出处
期刊:Nuclear Fusion
[IOP Publishing]
日期:2022-12-28
卷期号:63 (2): 026010-026010
标识
DOI:10.1088/1741-4326/aca91d
摘要
Abstract Hydrogen isotope exchange in China low activation martensitic (CLAM) steel was investigated by plasma-driven permeation (PDP) measurements in the temperature range of ∼670–920 K. It was found that as H was introduced into D plasma, the permeation flux of HD increased while that of D 2 decreased. The total D permeation flux, however, remained almost unchanged. Such a result allowed the analysis of isotope replacement and showed that the reduction of D 2 is balanced by the rise of HD. In addition, the formation of HD was found to be closely related to the H and D content in plasma. Hydrogen isotopic effects on H and D plasma dissociation/ionization rate and on incident flux were evaluated by measuring plasma parameters including electron temperature and electron density using a triple Langmuir probe. The correlation between isotope effects on ionization rate in the plasma and isotope effects in the permeation flux was discussed. He plasma pre-irradiation and seeding during D PDP were also conducted to investigate the He effects on D diffusion. The total D permeation flux was found to be reduced by He seeding. Data analysis of Langmuir probe showed that ionization rate of D plasma was influenced by He seeding. Besides, under simultaneous D + He irradiation, He atoms were preferentially trapped at the defects resulting in a shallower D concentration gradient that described the observed decrease in D permeation rate. He plasma pre-irradiation was found to reduce D permeation flux with a much slower breakthrough to reach steady-state. The amount of D trapped at He-induced defects was derived quantitatively from the transient permeation curves. It is believed that He bubbles formed at the near surface act as trapping sites of D atoms, leading to a less effective diffusion coefficient and an enhanced retention in the material.
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