Ar + H 2 Plasma Interacting with Lithium-Filled Capillary Porous Structure
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Ar + H2 Plasma Interacting with Lithium-Filled Capillary Porous Structure1 B. Wanga, *, X. C. Maa, L. Hanb, W. X. Xiaa, L. Shua, X. Caoa, L. Yanga, Z. Y. Zhanga, J. J. Weib, D. X. Yangb, P. N. Hea, and F. Goua a Institute b
of Nuclear Science and Technology, Sichuan University, Chengdu, 610064 P.R. China College of Physical Science and Technology, Sichuan University, Chengdu, 610064 P.R. China *e-mail: [email protected] Received December 8, 2017
Abstract—Ar + H2 plasma interacting with liquid lithium was carried out on a one-cathode linear plasma device (SCU-PSI). The lithium sample was covered with capillary porous structure (CPS). It is found that the electron temperature of applied plasma ranged from ~0–1 eV and electron density ranged from 0.1 × 1020 to 1 × 1020 m−3. The experimental results indicate that a reduction in the electron temperature and the lithium evaporation is found as the percentage of H2 increases When the ratio of argon and hydrogen keeps constant, the electron temperature and lithium evaporation increase with applied input power, respectively. The retention of hydrogen atoms in lithium surface results in reducing the lithium evaporation. The XRD analysis result shows that during plasma radiation no LiH is formed. DOI: 10.1134/S1063780X18070085
1. INTRODUCTION As a potential candidate of plasma facing materials, liquid lithium is widely regarded as the armor material for first wall and divertor plate in future fusion devices [1–6]. Compared with conventional solid plasma-facing component (PFC) [7–11], liquid lithium has many advantages such as withstanding high heat flux (>10 MW/m2), low Z and continuous recovery of lithium surface, compatibility with core plasma, absorbing impinging species. It is found that the amount of eroded lithium has an important influence on core plasma characteristics. The study of lithium erosion under different amount of hydrogen retention is important for the application of lithium as plasma facing material. To successfully apply liquid lithium to fusion reactors in future, exploring physical mechanism of lithium erosion and controlling liquid lithium evaporation in different plasma environment are crucial. Abramsa et al. [12] studied the erosion of lithium coatings on TZM molybdenum and graphite during highflux plasma bombardment. Their experimental results indicate that pure Li coatings on high-Z substrates lasted significantly longer than Li coatings on graphite. Allain et al. [13] studied sputtering of liquid lithium bombarded by D and He plasmas. Their results showed the retention of D in liquid lithium has no apparent effect on the erosion rate of liquid lithium. 1 The article is published in the original.
However, few studies have been performed on the thermal evaporation of lithium with capillary porous systems (CPS) under different amount of hydrogen retention. In this study, with the aim to investigate the effect of deposited hydrogen on evaporation of liquid lithium with CPS, the experiment was carried out on the onecathode linear plasma dev
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