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Effect of del B drift on the H-mode power threshold in upper single null plasmas with ITER-like tungsten divertor on EAST

文献类型：期刊论文

作者Chen, L.1; Xu, G. S.1,2; Yan, N.1; Nielsen, A. H.3; Liu, J. B.1; Gao, W.1; Chen, R.1; Qu, H.1; Ding, F.1; Mao, H. M.1
刊名PHYSICS OF PLASMAS
出版日期2018-07-01
卷号25期号:7页码:12
ISSN号1070-664X
DOI10.1063/1.5033983
通讯作者Xu, G. S.(gsxu@ipp.ac.cn) ; Yan, N.(yanning@ipp.ac.cn)
英文摘要In this paper, we will experimentally investigate the power threshold (PL-H) in upper single null plasmas with an ITER-like tungsten divertor under different del B drift directions on EAST [F. Ding et al., Commissioning and PSI Behavior of the ITER-Like W/Cu Divertor in EAST 22nd PSI, Rome (2016)]. The power threshold for the low (L) to high (H) confinement mode has a clear and positive toroidal magnetic field, B-T, dependence when the del B drift points toward the primary X-point (Bx del B up arrow). A factor of 2-3 increase in PL-H is observed for the del B drift away from the primary X-point (B x del B down arrow). The edge and core impurities quantified by spectroscopy measurements show comparable levels for the transitions for both drift directions. On the other hand, it is found that the divertor D alpha emission just prior to the L-H transition is lower for Bx del B up arrow, compared with that for Bx del B down arrow. The upper in-out divertor asymmetry, as manifested by particle fluxes measured by the divertor triple Langmuir probe, is most marked for Bx del B down arrow, and with significantly more particle flux to the outer divertor. The reversing field increases the particle flux into the upper inner and lower outer divertor, reducing the in-out asymmetry. One important distinction between the two field directions has been observed, with respect to the amplitude of the scrape-off layer (SOL) parallel flow. A dedicated experiment under similar target plasma conditions shows a lower SOL density and thus a steeper density gradient slightly inside the separatrix, where a lower PL-H is found for the Bx del B up arrow, compared to that for Bx del B down arrow. We, therefore, conclude that the fielddependent SOL plasma conditions play an important role in the transition physics. Published by AIP Publishing.
WOS关键词ALCATOR C-MOD ; DIII-D ; NEUTRAL DENSITY ; TRANSITION ; TOKAMAK ; EDGE ; TRANSPORT ; PHYSICS ; ASDEX ; FLOW
资助项目National Natural Science Foundation of China[11422546] ; National Natural Science Foundation of China[10990212] ; National Natural Science Foundation of China[10990210] ; National Natural Science Foundation of China[11321092] ; National Natural Science Foundation of China[11105181] ; SRG-HSC Project[2015SRG-HSC002] ; AHNFS[1808085J07] ; National Magnetic Confinement Fusion Science Program of China[2015GB101000] ; National Magnetic Confinement Fusion Science Program of China[2014GB124006] ; China Postdoctoral Science Foundation[2016M602043] ; Sino Danish Center for Education and Research
WOS研究方向Physics
语种英语
出版者AMER INST PHYSICS
WOS记录号WOS:000440589100039
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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源URL[http://ir.hfcas.ac.cn:8080/handle/334002/37721]  
专题中国科学院合肥物质科学研究院
通讯作者Xu, G. S.; Yan, N.
作者单位1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
3.Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark
4.Dalian Univ Technol, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China
推荐引用方式
GB/T 7714		 Chen, L.,Xu, G. S.,Yan, N.,et al. Effect of del B drift on the H-mode power threshold in upper single null plasmas with ITER-like tungsten divertor on EAST[J]. PHYSICS OF PLASMAS,2018,25(7):12.
APA Chen, L..,Xu, G. S..,Yan, N..,Nielsen, A. H..,Liu, J. B..,...&Wan, B. N..(2018).Effect of del B drift on the H-mode power threshold in upper single null plasmas with ITER-like tungsten divertor on EAST.PHYSICS OF PLASMAS,25(7),12.
MLA Chen, L.,et al."Effect of del B drift on the H-mode power threshold in upper single null plasmas with ITER-like tungsten divertor on EAST".PHYSICS OF PLASMAS 25.7(2018):12.

入库方式： OAI收割

来源：合肥物质科学研究院

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