首页|Coated boron layers by boronization and a real-time boron coating using an impurity powder dropper in the LHD

Coated boron layers by boronization and a real-time boron coating using an impurity powder dropper in the LHD

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In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow discharges.In 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning technique.In the LHD,which is a large-sized heliotron device,an additional helium(He)glow discharge cleaning(GDC)after boronization was operated for a reduction in hydrogen recycling from the coated boron layers.This operational time of 3 h was determined by spectroscopic data during glow discharges.A flat hydrogen profile is obtained on the top surface of the coated boron on the specimen exposed to boronization.The results suggest a reduction in hydrogen at the top surface by He-GDC.Trapped oxygen in coated boron was obtained by boronization,and the coated boron,which has boron-oxide,on the first wall by B-IPD was also shown.Considering the difference in coating areas between B2H6 boronization and B-IPD operation,it would be most effective to use the IPD and B2H6 boronization coating together for optimized wall conditioning.

boron layeroxygen impurityhydrogen recyclingimpurity powder dropperLHDEAST

Naoko ASHIKAWA、Robert LUNSFORD、Federico NESPOLI、Erik GILSON、Yaowei YU、Jiansheng HU、Shinichiro KADO

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National Institute for Fusion Science,Toki 509-5292,Japan

Princeton Plasma Physics Laboratory,Princeton NJ 08540,United States of America

Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China

Institute of Advanced Energy,Kyoto University,Kyoto 611-0011,Japan

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2024

10.1088/2058-6272/ad495f

等离子体科学和技术(英文版)
中国科学院合肥物质科学研究所 中国力学学会

等离子体科学和技术(英文版)

EI
影响因子：0.297
ISSN：1009-0630
年,卷(期)：2024.26(8)