| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Radiative divertor behavior and physics in Ar seeded plasma on EAST |
| Jingbo Chen(陈竞博)1,2, Yanmin Duan(段艳敏)1, Zhongshi Yang(杨钟时)1,2, Liang Wang(王亮)1, Kai Wu(吴凯)1,2, Kedong Li(李克栋)1,2, Fang Ding(丁芳)1, Hongmin Mao(毛红敏)1, Jichan Xu(许吉禅)1,2, Wei Gao(高伟)1, Ling Zhang(张凌)1, Jinhua Wu(吴金华)1, Guang-Nan Luo(罗广南)1,2, EAST Team1 |
1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
2 Science Island Branch of Graduate School, University of Science & Technology of China, Hefei 230031, China |
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Abstract To investigate the radiative divertor behavior and physics for the scenario of impurity seeded plasma in ITER, the radiative divertor experiments with argon (Ar) seeding under ITER-like tungsten divertor condition were carried out during recent EAST campaigns. The experimental results reveal the high efficiency of reducing heat load and particle flux onto the divertor targets owing to increased radiation by Ar seeding. We achieve detached plasmas in these experiments. The inner-outer divertor asymmetry reduces after Ar seeding. Impurities, such as Ar, C, Li, and W, exist in the entire space of the vacuum chamber during EAST operations, and play important roles in power exhausting and accelerating the plasma detachment process. It is remarkable that the contamination of the core plasma is observed using Ar seeding owing to the sputtering of plasma facing components (PFCs), particularly when Ar impurity is injected from the upper tungsten divertor.
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Received: 11 April 2017
Revised: 26 May 2017
Accepted manuscript online:
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PACS:
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52.55.Rk
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(Power exhaust; divertors)
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52.25.Vf
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52.40.Hf
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(Plasma-material interactions; boundary layer effects)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11575242, 11575243, 11505233, 11575247, and 11605238) and the National Magnetic Confinement Fusion Science Program (Grant Nos. 2013GB105002 and 2013GB105001). |
Corresponding Authors:
Zhongshi Yang
E-mail: zsyang@ipp.ac.cn
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Cite this article:
Jingbo Chen(陈竞博), Yanmin Duan(段艳敏), Zhongshi Yang(杨钟时), Liang Wang(王亮), Kai Wu(吴凯), Kedong Li(李克栋), Fang Ding(丁芳), Hongmin Mao(毛红敏), Jichan Xu(许吉禅), Wei Gao(高伟), Ling Zhang(张凌), Jinhua Wu(吴金华), Guang-Nan Luo(罗广南), EAST Team Radiative divertor behavior and physics in Ar seeded plasma on EAST 2017 Chin. Phys. B 26 095205
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