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

Liping DONG (董丽平); Yanmin DUAN (段艳敏); Kaiyun CHEN (陈开云); Xiuda YANG (杨秀达); Ling ZHANG (张凌); Feng XU (徐峰); Jingbo CHEN (陈竞博); Songtao MAO (毛松涛); Zhenwei WU (吴振伟); Liqun HU (胡立群)

doi:10.1088/2058-6272/aab20c

Plasma Science and Technology > 2018 > 20(6): 65102-065102. > DOI: 10.1088/2058-6272/aab20c

Liping DONG (董丽平), Yanmin DUAN (段艳敏), Kaiyun CHEN (陈开云), Xiuda YANG (杨秀达), Ling ZHANG (张凌), Feng XU (徐峰), Jingbo CHEN (陈竞博), Songtao MAO (毛松涛), Zhenwei WU (吴振伟), Liqun HU (胡立群). Influence of impurity seeding on the plasma radiation in the EAST tokamak[J]. Plasma Science and Technology, 2018, 20(6): 65102-065102. DOI: 10.1088/2058-6272/aab20c

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

¹ Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
² University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: This work was supported by National Natural Science Foundation of China (Grant Nos. 11575247, 11605243, 11575244), National Magnetic Confinement Fusion Science Program of China (Grant No. 2014GB124006).

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Received Date: October 08, 2017

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Abstract

Abstract

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 frad (P_rad/P_heat) about 60%–70% have been achieved in the recent EAST experimental campaign in 2015–2016.
- impurity seeding,
- radiation profile,
- AXUV photodiodes,
- impurity sputtering

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References (26)

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