Influence of impurity seeding on the plasma radiation in the EAST tokamak

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Dong Liping ^1,2 Duan Yanmin ¹ Chen Kaiyun ¹ Yang Xiuda ¹ Zhang Ling ¹ Xu Feng ^1,2 Chen Jingbo ^1,2 Mao Songtao ^1,2 Wu Zhenwei ¹ Hu Liqun ¹

文摘	Plasma radiation characteristics in EAST argon (Ar) gas and neon (Ne) gas seeding experiments are studied. The radiation profiles reconstructed from the fast bolometer measurement data by tomography method are compared with the ones got from the simulation program based on corona model. And the simulation results coincide roughly with the experimental data. For Ar seeding discharges, the substantial enhanced radiations can be generally observed in the edge areas at normalized radius ρ_(pol)∼0.7-0.9, while the enhanced regions are more outer for Ne seeding discharges. The influence of seeded Ar gas on the core radiation is related to the injected position. In discharges with LSN divertor configuration, the Ar ions can permeate into the core region more easily when being injected from the opposite upper divertor ports. In USN divertor configuration, the W impurity sputtered from the upper divertor target plates are observed to be an important contributor to the increase of the core radiation no matter impurity seeding from any ports. The maximum radiated power fractions f_(rad) (P_(rad)/P_(heat)) about 60%-70 %have been achieved in the recent EAST experimental campaign in 2015-2016.
来源	Plasma Science & Technology ,2018,20(6):065102-1-065102-7 【核心库】
DOI	10.1088/2058-6272/aab20c
关键词	impurity seeding ; radiation profile ; AXUV photodiodes ; impurity sputtering
地址	1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031 2. University of Science and Technology of China, Hefei, 230026
语种	英文
文献类型	研究性论文
ISSN	1009-0630
学科	原子能技术
基金	国家自然科学基金 ; National Magnetic Confinement Fusion Science Program of China
文献收藏号	CSCD:6264523