Type-I ELM mitigation by continuous lithium granule gravitational injection into the upper tungsten divertor in EAST
文献类型：期刊论文
| 作者 | Sun,Z.2; Qian,Y.Z.3,4; Maingi,R.2; Wang,Y.F.3; Wang,Y.M.3; Nagy,A.2; Tritz,K.5; Lunsford,R.2; Gilson,E.2; Zuo,G.Z.3 |
| 刊名 | Nuclear Fusion
 |
| 出版日期 | 2021-05-13 |
| 卷号 | 61 |
| ISSN号 | 0029-5515 |
| 关键词 | impurity seeding lithium edge localized modes EAST |
| DOI | 10.1088/1741-4326/abf855 |
| 通讯作者 | Sun, Z.(zsun@pppl.gov) ; Hu, J. S.(hujs@ipp.ac.cn) |
| 英文摘要 | AbstractLarge edge-localized modes (ELMs) were mitigated by gravitational injection of lithium granules into the upper X-point region of the experimental advanced superconducting tokamak (EAST) device with tungsten plasma-facing components. The maximum ELM size was reduced by ～70% in high βN H-mode plasmas. Large ELM stabilization was sustained for up to about 40 energy confinement times, with constant core radiated power and no evidence of high-Z or low-Z impurity accumulation. The lithium granules injection reduced the edge plasma pedestal density and temperature and their gradients, due to increased edge radiation and reduced recycling from the plasma-facing components. Ideal stability calculations using the ELITE code indicate that the stabilization of large ELMs correlates with improved stability of intermediate-n peeling-ballooning modes, due to reduced edge current resulting from the profile changes. The pedestal pressure reduction was partially offset by a core density increase, which resulted in a modest ～7% drop in core stored energy and normalized energy confinement time. We surmise that the remnant small ELMs are triggered by the penetration of multiple Li granules just past the separatrix, similar to small ELMs triggered by deuterium pellet Futatani et?al (2014 Nucl. Fusion 54 073008). This study extends previous ELM elimination with Li powder injection Maingi et?al (2018 Nucl. Fusion 58 024003) in EAST because (1) use of small, dust-like powder and the related potential health hazards were eliminated, and (2) use of macroscopic granules should be more applicable to future devices, due to deeper penetration than dust particles, e.g. inside the separatrix with velocities ～10?m?s?1 in EAST. |
| WOS关键词 | EDGE LOCALIZED MODES ; PELLET INJECTION ; PLASMAS ; CONFINEMENT ; ENERGY ; POWER ; ITER ; JET |
| 资助项目 | National Key Research and Development Program of China[2017YFA0402500] ; National Key Research and Development Program of China[2017YFE0301100] ; National Nature Science Foundation of China[11625524] ; National Nature Science Foundation of China[11775261] ; National Nature Science Foundation of China[11905148] ; National Nature Science Foundation of China[11905138] ; US Dept. of Energy[DE-AC0209CH11466] ; US Dept. of Energy[DESC0016553] ; US Dept. of Energy[DE-FC02-04ER54698] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | IOP Publishing |
| WOS记录号 | IOP:0029-5515-61-6-ABF855 |
| 资助机构 | National Key Research and Development Program of China ; National Nature Science Foundation of China ; US Dept. of Energy |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/122517]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 作者单位 | 1.Institute of Energy, Hefei Comprehensive National Science Center, 230031, China 2.Princeton Plasma Physics Laboratory, 100 Stellarator Road, Princeton, NJ 08540, United States of America 3.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China 4.Department of Physics, Nanchang University, Nanchang 330031, China 5.Johns Hopkins University, Baltimore, MD 21211, United States of America 6.Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS, Hefei 230031, China |
| 推荐引用方式 GB/T 7714 | Sun,Z.,Qian,Y.Z.,Maingi,R.,et al. Type-I ELM mitigation by continuous lithium granule gravitational injection into the upper tungsten divertor in EAST[J]. Nuclear Fusion,2021,61. |
| APA | Sun,Z..,Qian,Y.Z..,Maingi,R..,Wang,Y.F..,Wang,Y.M..,...&the EAST team,.(2021).Type-I ELM mitigation by continuous lithium granule gravitational injection into the upper tungsten divertor in EAST.Nuclear Fusion,61. |
| MLA | Sun,Z.,et al."Type-I ELM mitigation by continuous lithium granule gravitational injection into the upper tungsten divertor in EAST".Nuclear Fusion 61(2021). |
入库方式： OAI收割
来源：合肥物质科学研究院
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