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

作     者：Naoko ASHIKAWA Robert LUNSFORD Federico NESPOLI Erik GILSON Yaowei YU Jiansheng HU Shinichiro KADO 

作者机构：National Institute for Fusion ScienceToki 509-5292Japan Princeton Plasma Physics LaboratoryPrinceton NJ 08540United States of America Institute of Plasma PhysicsChinese Academy of SciencesHefei 230031People’s Republic of China Institute of Advanced EnergyKyoto UniversityKyoto 611-0011Japan 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2024年第26卷第8期

页      面：25-31页

核心收录：

学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：supported by NIFS budgets,KOBF031,ULFF004,KUHR032 partly supported by JSPS KAKENHI 18K04999 JSPS-CAS Bilateral Joint Research Projects,“Control of wall recycling on metallic plasma-facing materials in fusion reactor”2019-2022,(No.GJHZ201984) the Chinese Academy of Sciences President’s International Fellowship Initiative Grant No.2024VMB0003 in FY2023 the U.S.Department Of Energy under Contract No.DE-AC02-09CH11466 with Princeton University 

主　　题：boron layer oxygen impurity hydrogen recycling impurity powder dropper LHD EAST 

摘      要：In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow *** 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning *** 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 *** 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 *** results suggest a reduction in hydrogen at the top surface by *** 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 *** 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.