First demonstration of full ELM suppression in low input torque plasmas to support ITER research plan using n=4 RMP in EAST
文献类型：期刊论文
| 作者 | Sun, Y.4 ; Ma, Q.4,5; Jia, M.4; Gu, S.2; Loarte, A.3; Liang, Y.4,6; Liu, Y. Q.1; Paz-Soldan, C. A.7; Wu, X. M.4,5; Xie, P. C.4,5
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| 刊名 | NUCLEAR FUSION
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| 出版日期 | 2021-10-01 |
| 卷号 | 61 |
| ISSN号 | 0029-5515 |
| 关键词 | resonant magnetic perturbations ELM suppression low input torque tokamak |
| DOI | 10.1088/1741-4326/ac1a1d |
| 通讯作者 | Sun, Y.(ywsun@ipp.ac.cn) |
| 英文摘要 | Full suppression of type-I edge localized modes (ELMs) using n = 4 resonant magnetic perturbations (RMPs) as planned for ITER has been demonstrated for the first time (n is the toroidal mode number of the applied RMP). This is achieved in EAST plasmas with low input torque and tungsten divertor, and the target plasma for these experiments in EAST is chosen to be relevant to the ITER Q = 10 operational scenario, thus also addressing significant scenario issues for ITER. In these experiments the lowest neutral beam injection (NBI) input torque is around T (NBI) similar to 0.44 Nm, which extrapolates to around 14 Nm in ITER (compared to a total torque input of 35 Nm when 33 MW of NBI are used for heating). The q (95) is around 3.6 and normalized plasma beta beta (N) similar to 1.5-1.8, similar to that in the ITER Q = 10 scenario. Suppression windows in both q (95) and plasma density are observed; in addition, lower plasma rotation is found to be favourabe to access ELM suppression. ELM suppression is maintained with line averaged density up to 60%n (GW) (Greenwald density limit) by feedforward gas fuelling after suppression is achieved. It is interesting to note that in addition to an upper density, a low density threshold for ELM suppression of 40%n (GW) is also observed. In these conditions energy confinement does not significantly drop (<10%) during ELM suppression when compared to the ELMy H-mode conditions, which is much better than previous results using low n (n = 1 and 2) RMPs in higher q (95) regimes. In addition, the core plasma tungsten concentration is clearly reduced during ELM suppression demonstrating an effective impurity exhaust. MHD response modelling using the MARS-F code shows that edge magnetic field stochasticity has a peak at q (95) similar to 3.65 for the odd parity configuration, which is consistent to the observed suppression window around 3.6-3.75. These results expand the physical understanding of ELM suppression and demonstrate the effectiveness of n = 4 RMPs for reliable control ELMs in future ITER high Q plasma scenarios with minimum detrimental effects on plasma confinement. |
| 资助项目 | National Key R&D Program of China[2017YFE0301100] ; National Natural Science Foundation of China[11875292] ; National Natural Science Foundation of China[12005261] ; US DOE[DE-SC0020298] ; US DOE[DE-SC0021968] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | IOP Publishing Ltd |
| WOS记录号 | WOS:000706467800001 |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China ; US DOE |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/125535]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Sun, Y. |
| 作者单位 | 1.Gen Atom, POB 85608, San Diego, CA USA 2.Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA 3.ITER Org, Route Vinon Sur Verdon, F-13115 St Paul Les Durance, France 4.Chinese Acad Sci, Inst Plasma Phys, HHIPS, POB 1126, Hefei 230031, Peoples R China 5.USTC, Sci Isl Branch, Grad Sch, Hefei 230026, Peoples R China 6.Forschungszentrum Julich, Assoc EURATOM FZJ, Inst Energy & Climate Res Plasma Phys, D-52425 Julich, Germany 7.Columbia Univ, Dept Appl Phys & Appl Math, New York, NY USA 8.Enn Sci & Technol Dev Co Ltd, Langfang, Peoples R China 9.Hebei Key Lab Compact Fus, Langfang 065001, Peoples R China 10.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Y.,Ma, Q.,Jia, M.,et al. First demonstration of full ELM suppression in low input torque plasmas to support ITER research plan using n=4 RMP in EAST[J]. NUCLEAR FUSION,2021,61. |
| APA | Sun, Y..,Ma, Q..,Jia, M..,Gu, S..,Loarte, A..,...&Zhou, C..(2021).First demonstration of full ELM suppression in low input torque plasmas to support ITER research plan using n=4 RMP in EAST.NUCLEAR FUSION,61. |
| MLA | Sun, Y.,et al."First demonstration of full ELM suppression in low input torque plasmas to support ITER research plan using n=4 RMP 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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