Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases

被引：0
|
作者：
Zhang R. [1 ]
Kajita S. [2 ]
Hwangbo D. [3 ]
Tanaka H. [1 ]
Ohno N. [1 ]
机构：
[1] Graduate School of Engineering, Nagoya University, Nagoya
[2] Institute of Materials and Sustainable Systems, Nagoya University, Nagoya
[3] Faculty of Pure and Applied Sciences, University of Tsukuba, 305-8577, Ibaraki
来源：
Plasma and Fusion Research | 2021年 / 16卷
基金：
日本学术振兴会;
关键词：
fuzz; impurity seeding; nano-tendril bundles; tungsten; unipolar arc;
D O I：
10.1585/PFR.16.2405069
中图分类号：
学科分类号：
摘要：
Arcing was ignited on deformed tungsten (W) surfaces, where W fuzz and/or nano-tendril bundles (NTBs) were grown, by steady state helium (He) plasma exposures with impurity gas seeding. At the same sample potential of −250 V, the presence of NTBs enhanced the frequency of arc ignition, whereas no arc ignition appeared on typical fuzz surfaces without NTBs. After a series of arc ignitions on a sample surface with NTBs, the aspect ratio of NTBs decreased, indicating that protruded NTBs with larger aspect ratio tend to trigger arcing easily. © 2021. The Japan Society of Plasma Science and Nuclear Fusion Research.
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页码：1 / 5
页数：4
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