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

Plasma Science and Technology 2021年第5期23卷 11-17页

作者： Junru WANG Yaowei YU Houyin WANG Bin CAO Jiansheng HU Wei XU Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Key Laboratory of Photovoltaic and Energy Conservation Materials Chinese Academy of SciencesHefei 230031People’s Republic of China

The steady fusion plasma operation is constrained by tungsten(W)material sputtering issue in the EAST *** this work,the suppression of W sputtering source has been studied by advanced wall *** is also concluded that the W sputtering yield becomes more with increasing carbon(C)content in the main deuterium(D)*** EAST,the integrated use of discharge cleanings and lithium(Li)coating has positive effects on the suppression of W sputtering *** 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 *** 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 *** general,the sputtering yield of W would decrease from the source,on the bias of the improvement of wall condition and the mitigation of plasmawall interaction *** lays important base of the achievement of high-parameter and longpulse plasma operation in *** experiences also would be constructive for us to promote the understanding of relevant physics and basis towards the ITER-like condition.

关键词： tungsten sputtering source carbon impurity wall conditioning PWI EAST

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