Microstructure and Deuterium Retention of Tungsten Deposited by Hollow Cathode Discharge in Deuterium Plasma Supported by the National Magnetic Confinement Fusion Program under Grant No 2015GB109003, and the National Natural Science Foundation of China under Grant No 11675010

Tungsten has been chosen as one of the most promising candidates as the plasma-facing material in future fusion reactors. Although tungsten has numerous advantages compared with other materials, issues including dust are rather difficult to deal with. Dust is produced in fusion devices by energetic...

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Bibliographic Details
Published in:Chinese physics letters 2017-12, Vol.34 (12)
Main Authors: Sun, Zhong-Chao, Lian, Zi-Wei, Qiao, Wei-Na, Yu, Jian-Gang, Han, Wen-Jia, Fu, Qing-Wei, Zhu, Kai-Gui
Format: Article
Language:English
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Summary:Tungsten has been chosen as one of the most promising candidates as the plasma-facing material in future fusion reactors. Although tungsten has numerous advantages compared with other materials, issues including dust are rather difficult to deal with. Dust is produced in fusion devices by energetic plasma-surface interaction. The re-deposition of dust particles could cause the retention of fuel atoms. In this work, tungsten is deposited with deuterium plasma by hollow cathode discharge to simulate the dust production in a tokamak. The morphology of the deposited tungsten can be described as a film with spherical particles on it. Thermal desorption spectra of the deposited tungsten show extremely high desorption of the peak positions. It is also found that there is a maximum retention of deuterium in the deposited tungsten samples due to the dynamic equilibrium of the deposition and sputtering process on the substrates.
ISSN:0256-307X
DOI:10.1088/0256-307X/34/12/125203