Study of the tungsten sputtering source suppression by wall conditionings in the EAST tokamak

Junru WANG (王俊儒); Yaowei YU (余耀伟); Houyin WANG (王厚银); Bin CAO (曹斌); Jiansheng HU (胡建生); Wei XU (徐伟)

doi:10.1088/2058-6272/abec63

Plasma Science and Technology > 2021 > 23(5): 55101-055101. > DOI: 10.1088/2058-6272/abec63

Junru WANG (王俊儒), Yaowei YU (余耀伟), Houyin WANG (王厚银), Bin CAO (曹斌), Jiansheng HU (胡建生), Wei XU (徐伟). Study of the tungsten sputtering source suppression by wall conditionings in the EAST tokamak[J]. Plasma Science and Technology, 2021, 23(5): 55101-055101. DOI: 10.1088/2058-6272/abec63

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Study of the tungsten sputtering source suppression by wall conditionings in the EAST tokamak

¹ Institute of Plasma Physics, Hefei Institutes of Physical Science, 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
³ Key Laboratory of Photovoltaic and Energy Conservation Materials, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

Funds: This work is supported by the National Key Research and Development Program of China (Nos. 2017YFE0301100 and 2017YFA0402500), National Natural Science Foundation of China (No. 11605237), and the Users with Excellence Program of Hefei Science Center CAS (2020HSC-UE010).

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Received Date: November 16, 2020
Revised Date: March 03, 2021
Accepted Date: March 04, 2021

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Abstract

Abstract

The steady fusion plasma operation is constrained by tungsten (W) material sputtering issue in the EAST tokamak. In this work, the suppression of W sputtering source has been studied by advanced wall conditionings. It is also concluded that the W sputtering yield becomes more with increasing carbon (C) content in the main deuterium (D) plasma. In EAST, the integrated use of discharge cleanings and lithium (Li) coating has positive effects on the suppression of W sputtering source. In the plasma recovery experiments, it is suggested that the W intensity is reduced by approximately 60% with the help of ~35 h Ion Cyclotron Radio Frequency Discharge Cleaning (ICRF-DC) and ~40 g Li coating after vacuum failure. The first wall covered by Li film could be relieved from the bombardment of energetic particles, and the impurity in the vessel would be removed through the particle induced desorption and isotope exchange during the discharge cleanings. In general, the sputtering yield of W would decrease from the source, on the bias of the improvement of wall condition and the mitigation of plasma-wall interaction process. It lays important base of the achievement of high-parameter and long-pulse plasma operation in EAST. The experiences also would be constructive for us to promote the understanding of relevant physics and basis towards the ITER-like condition.
- tungsten sputtering source,
- carbon impurity,
- wall conditioning,
- PWI,
- EAST

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References (39)

References

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Study of the tungsten sputtering source suppression by wall conditionings in the EAST tokamak