| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Experimental investigation on divertor tungsten sputtering with neon seeding in ELMy H-mode plasma in EAST tokamak |
| Dawei Ye(叶大为)1,2, Fang Ding(丁芳)1,†, Kedong Li(李克栋)1,2, Zhenhua Hu(胡振华)1, Ling Zhang(张凌)1, Xiahua Chen(陈夏华)1,2, Qing Zhang(张青)1,2, Pingan Zhao(赵平安)1,2, Tao He(贺涛)1,2, Lingyi Meng(孟令义)1,2, Kaixuan Ye(叶凯萱)1, Fubin Zhong(钟富彬)1, Yanmin Duan(段艳敏)1, Rui Ding(丁锐)1, Liang Wang(王亮)1, Guosheng Xu(徐国盛)1, Guangnan Luo(罗广南)1,2, and EAST team |
1 Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences(CAS), Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China |
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Abstract Neon (Ne) seeding is used to cool the edge plasma by radiation to protect the divertor tungsten (W) target in the Experimental Advanced Superconducting Tokamak (EAST). The W sputtering in the outer divertor target with Ne seeding is assessed by the divertor visible spectroscopy system. It is observed that the W sputtering flux initially increases with Ne concentration in the divertor despite the decreasing plasma temperature. After reaching a maximum around 25 eV, the W sputtering rate starts to decrease, presenting a suppression effect. The effect on the divertor W sputtering flux and yield due to the competition between the increase of the Ne concentration and the decrease of the plasma temperature is discussed. The results show that enough Ne seeding is essential to effectively reduce the electron temperature and thus to suppress W sputtering. Moreover, ELM suppression is observed when Ne and W impurities enter the core plasma, which could be correlated to the enhanced turbulence transport in the pedestal.
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Received: 22 December 2021
Revised: 22 January 2022
Accepted manuscript online: 27 January 2022
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PACS:
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52.25.Vy
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(Impurities in plasmas)
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52.40.Hf
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(Plasma-material interactions; boundary layer effects)
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52.30.Cv
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(Magnetohydrodynamics (including electron magnetohydrodynamics))
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFE0301300, 2017YFA0402500, and 2018YFE0303103), the National Natural Science Foundation of China (Grant Nos. 12192283 and 12022511), the Users with Excellence Project of Hefei Science Center, CAS (Grant No. 2018HSC-UE008), the CASHIPS Director's Fund (Grant No. BJPY2019B01), the JSPS-CAS Bilateral Joint Research Project (Grant No. GJHZ201984), and the Key Research Program of Frontier Sciences of CAS (Grant No. ZDBS-LY-SLH010). |
Corresponding Authors:
Fang Ding
E-mail: fding@ipp.ac.cn
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Cite this article:
Dawei Ye(叶大为), Fang Ding(丁芳), Kedong Li(李克栋), Zhenhua Hu(胡振华), Ling Zhang(张凌), Xiahua Chen(陈夏华), Qing Zhang(张青), Pingan Zhao(赵平安), Tao He(贺涛), Lingyi Meng(孟令义), Kaixuan Ye(叶凯萱), Fubin Zhong(钟富彬), Yanmin Duan(段艳敏), Rui Ding(丁锐), Liang Wang(王亮), Guosheng Xu(徐国盛), Guangnan Luo(罗广南), and EAST team Experimental investigation on divertor tungsten sputtering with neon seeding in ELMy H-mode plasma in EAST tokamak 2022 Chin. Phys. B 31 065201
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