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Physics design of new lower tungsten divertor for long-pulse high-power operations in EAST
Xu, G. S.1,2; Wang, L.1; Yao, D. M.1; Jia, G. Z.1; Sang, C. F.3; Liu, X. J.1; Chen, Y. P.1; Si, H.1; Yang, Z. S.1; Guo, H. Y.4,5; Du, H. L.6; Luo, Z. P.1; Li, H.1; Zhou, Z. B.1; Cao, L.1; Xu, H. C.1; Xu, T. J.1; Wang, Z. L.1; Zi, P. F.1; Li, L.1; Han, L.1; Xu, J. C.7; Liu, J. B.1; Li, K. D.1; Cao, B.1; Yu, Y. W.1; Ding, F.1; Ding, R.1; Yan, N.1; Meng, L. Y.1,2; Tao, Y. Q.1,2; Wang, H. Q.8; Zhang, Y.1; Shao, L. M.1; Zhang, X. D.1; Zhu, S. Z.1; Wan, B. N.1
2021-12-01
Source PublicationNUCLEAR FUSION
ISSN0029-5515
Corresponding AuthorXu, G. S.(gsxu@ipp.ac.cn) ; Jia, G. Z.(gzjia@ipp.ac.cn)
AbstractA new lower tungsten divertor has been developed and installed in the EAST superconducting tokamak to replace the previous graphite divertor with power handling capability increasing from <2 MW m(-2) to similar to 10 MW m(-2), aiming at achieving long-pulse H-mode operations in a full metal wall environment with the steady-state divertor heat flux of similar to 10 MW m(-2). A new divertor concept, 'corner slot' (CS) divertor, has been employed. By using the 'corner effect', a strongly dissipative divertor with the local buildup of high neutral pressure near the corner can be achieved, so that stable detachment can be maintained across the entire outer target plate with a relatively lower impurity seeding rate, at a separatrix density compatible with advanced steady-state core scenarios. These are essential for achieving efficient current drive with low-hybrid waves, a low core impurity concentration and thus a low loop voltage for fully non-inductive long-pulse operations. Compared with the highly closed small-angle-slot divertor in DIII-D, the new divertor in EAST exhibits the following merits: (1) a much simpler geometry with integral cassette body structure, combining vertical and horizontal target plates, which are more suitable for actively water-cooled W/Cu plasma facing components, facilitating installation precision control for minimizing surface misalignment, achieving high engineering reliability and lowering the capital cost as well; (2) it has much greater flexibility in magnetic configurations, allowing for the position of the outer strike point on either vertical or horizontal target plates to accommodate a relatively wide triangularity range, delta (l) = 0.4-0.6, thus enabling to explore various advanced scenarios. A water-cooled copper in-vessel coil has been installed under the dome. Five supersonic molecular beam injection systems have been mounted in the divertor to achieve faster and more precise feedback control of the gas injection rate. Furthermore, this new divertor allows for double null divertor operation and slowly sweeping the outer strike point across the horizontal and vertical target plates to spread the heat flux for long-pulse operations. Preliminary experimental results demonstrate the 'corner effect' and are in good agreement with simulations using SOLPS-ITER code including drifts. The EAST new divertor provides a test-bed for the closed divertor concept to achieve steady-state detachment operation at high power. Next step, a more closed divertor, 'sharp-cornered slot' divertor, building upon the current CS divertor concept, has been proposed as a candidate for the EAST upper divertor upgrade.
Keywordtungsten divertor upgrade closed divertor concept plasma-material interaction divertor detachment EAST tokamak
DOI10.1088/1741-4326/ac3297
WOS KeywordDETACHMENT ; IMPLEMENTATION ; OPTIMIZATION ; EXHAUST
Indexed BySCI
Language英语
Funding ProjectNational Magnetic Confinement Fusion Energy R&D Program of China[2019YFE03030000] ; National Magnetic Confinement Fusion Energy R&D Program of China[2018YFE0303104] ; National Magnetic Confinement Fusion Energy R&D Program of China[2017YFE0301300] ; National Magnetic Confinement Fusion Energy R&D Program of China[2017YFE0300402] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[11922513] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH001] ; CASHIPS Director's Fund[BJPY2019A01] ; AHNSF[1808085J07]
Funding OrganizationNational Magnetic Confinement Fusion Energy R&D Program of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; CASHIPS Director's Fund ; AHNSF
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS IDWOS:000722411300001
PublisherIOP Publishing Ltd
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/126751
Collection中国科学院合肥物质科学研究院
Corresponding AuthorXu, G. S.; Jia, G. Z.
Affiliation1.Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Peoples R China
2.Univ Sci & Technol China, Hefei 230026, Peoples R China
3.Dalian Univ Technol, Dalian 116024, Peoples R China
4.ENN Energy Holdings Ltd, Langfang 065001, Peoples R China
5.ENN Sci & Technol Dev Co Ltd, Langfang 065001, Peoples R China
6.Southwestern Inst Phys, Box 432, Chengdu 610041, Peoples R China
7.Anhui Univ Sci & Technol, Sch Mech Engn, Huainan 232001, Peoples R China
8.Gen Atom, POB 85608, San Diego, CA 92186 USA
First Author AffilicationChinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China
Corresponding Author AffilicationChinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Xu, G. S.,Wang, L.,Yao, D. M.,et al. Physics design of new lower tungsten divertor for long-pulse high-power operations in EAST[J]. NUCLEAR FUSION,2021,61.
APA Xu, G. S..,Wang, L..,Yao, D. M..,Jia, G. Z..,Sang, C. F..,...&Wan, B. N..(2021).Physics design of new lower tungsten divertor for long-pulse high-power operations in EAST.NUCLEAR FUSION,61.
MLA Xu, G. S.,et al."Physics design of new lower tungsten divertor for long-pulse high-power operations in EAST".NUCLEAR FUSION 61(2021).
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