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Estimation of carbon impurity from the guard limiter of the lower hybrid wave antenna on EAST tokamak
Ou, Jing1,2; Xiang, Nong1,2; Liu, Liang1; Men, Zongzheng1; Zhang, Ling1; Mao, Songtao1; Chen, Meiwen1
2018-12-01
发表期刊PLASMA PHYSICS AND CONTROLLED FUSION
ISSN0741-3335
通讯作者Ou, Jing(ouj@ipp.ac.cn)
摘要Hot spots on the EAST tokamak graphite guard limiters of the lower hybrid wave (LHW) antenna may cause a sudden increase of impurity influx and even ending with disruption. A sheath model is developed by taking into account the energetic electron component from the plasma-LHW interaction via electron Landau damping, and then a self-consistent method is used to study the interaction of the plasma across the sheath at the material surface and material thermal response. It is found that the fast electron fluxes driven by both the 2.45 and 4.6 GHz LHWs modify strongly the sheath potential, which then influence on the bombarding ion energy at the material surface and the surface temperature. By calculating the carbon physical sputtering and chemical erosion from guard limiter of the LHW antenna, the carbon production from the guard limiter in two LHW systems is found to have different behavior for the same edge plasma density and electron temperature. Our results show that carbon impurity is mainly from physical sputtering, except for the 4.6 GHz LHW in a narrow range of the high electron temperature where the chemical erosion has a very sharp increase. Due to modification of the sheath potential induced by the fast electrons, the power density is higher with the 4.6 GHz than the 2.45 GHz LHW system. As a consequence the surface temperature is higher at 4.6 GHz and susceptible to reach several hundred of degrees which is prone to chemical erosion.
关键词physical sputtering chemical erosion hot spot plasma sheath
DOI10.1088/1361-6587/aae81e
关键词[WOS]PRIMARY ELECTRONS ; CHEMICAL EROSION ; FUSION DEVICES ; PLASMA ; DEPOSITION ; ASYMMETRIES ; DIVERTOR ; UPGRADE ; ASDEX ; YIELD
收录类别SCI
语种英语
资助项目AHNFS[1808085J0] ; National Magnetic Confinement Fusion Science Program of China[2015GB101003] ; National Natural Science Foundation of China[11775257] ; National Natural Science Foundation of China[11475223] ; National Key R&D Program of China[2017YFE0300400] ; National Key R&D Program of China[2017YFE0300400] ; National Natural Science Foundation of China[11475223] ; National Natural Science Foundation of China[11775257] ; National Magnetic Confinement Fusion Science Program of China[2015GB101003] ; AHNFS[1808085J0]
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WOS研究方向Physics
WOS类目Physics, Fluids & Plasmas
WOS记录号WOS:000449418100002
出版者IOP PUBLISHING LTD
引用统计
被引频次：3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.hfcas.ac.cn:8080/handle/334002/34476
专题中科院等离子体物理研究所
通讯作者Ou, Jing
作者单位1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
2.Chinese Acad Sci, Magnet Fus Theory, Hefei 230031, Anhui, Peoples R China
第一作者单位中科院等离子体物理研究所
通讯作者单位中科院等离子体物理研究所
推荐引用方式
GB/T 7714		 Ou, Jing,Xiang, Nong,Liu, Liang,et al. Estimation of carbon impurity from the guard limiter of the lower hybrid wave antenna on EAST tokamak[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2018,60(12):11.
APA Ou, Jing.,Xiang, Nong.,Liu, Liang.,Men, Zongzheng.,Zhang, Ling.,...&Chen, Meiwen.(2018).Estimation of carbon impurity from the guard limiter of the lower hybrid wave antenna on EAST tokamak.PLASMA PHYSICS AND CONTROLLED FUSION,60(12),11.
MLA Ou, Jing,et al."Estimation of carbon impurity from the guard limiter of the lower hybrid wave antenna on EAST tokamak".PLASMA PHYSICS AND CONTROLLED FUSION 60.12(2018):11.
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