Scenario development for high βp low torque plasma with qmin above 2 and large-radius internal transport barrier in DIII-D
文献类型：期刊论文
| 作者 | Ding,S.1; Xu,G.S.1; Wang,Q.2; Solomon,W.M.3; Zhao,Y.4; Gong,X.1; Garofalo,A.M.3; Holcomb,C.T.5; McKee,G.6; Yan,Z.6 |
| 刊名 | Nuclear Fusion
 |
| 出版日期 | 2016-09-30 |
| 卷号 | 57 |
| 关键词 | internal transport barrie high poloidal beta low torque high minimum safty factor |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/0029-5515/57/2/022016 |
| 英文摘要 | Abstract A recent experiment on DIII-D, which was conducted by the joint research team from DIII-D and EAST, has extended the previous high βp, high qmin regime, which has been tested in the 2013 DIII-D/EAST joint experiment, to inductive operation at higher plasma current (Ip=0.8 MA) and significantly higher normalized fusion performance (G=H89βN/q952=0.16). The experiment aims at exploring high performance scenario with qmin>2 and reduced torque for long pulse operation, which can be potentially extrapolated to EAST. The effort was largely motivated by the interest in developing a feasible scenario for long-pulse high performance operation with low torque on EAST. Very high confinement, H89??=??3.5 or H98,y2=2.1 with βN～3.0, has been achieved transiently in this experiment together with qmin>2 and reduced NBI torque (3～5 N m). The excellent confinement is associated with the spontaneous formation of an internal transport barrier (ITB) in plasmas with Ip=0.8 MA at large minor radius (normalized ρ～0.7) in all channels (ne, Te, Ti, V?, especially strong in the Te channel). Fluctuation measurements show a significant reduction in the fluctuation levels, including AE modes and broadband turbulence, at the location where an ITB forms. Linear gyrokinetic simulations also support the decrease of the growth rate of the most unstable mode during strong ITB formation. The simulation implies that strong suppression of turbulence and a positive feedback loop may be active in this process and is responsible for the spontaneous formation of large-radius ITB. In an unstable ITB phase, an ELM crash is observed to have a positive effect on transient formation of large-radius ITB. The formation of this kind of ITB is found to have a shielding (protecting) effect on the core plasma while isolating the perturbation due to ELM crash. |
| 语种 | 英语 |
| WOS记录号 | IOP:0029-5515-57-2-022016 |
| 出版者 | IOP Publishing |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/42854]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 作者单位 | 1.Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People’s Republic of China 2.Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, 310027, People’s Republic of China 3.General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA 4.Soochow University, Suzhou, Jiangsu 215006, People’s Republic of China 5.Lawrence Livermore National Laboratory, Livermore, CA 94551, USA 6.University of Wisconsin-Madison, Madison, WI 53706, USA 7.Oak Ridge Associated Universities, Oak Ridge, TN, 37831-0117, USA |
| 推荐引用方式 GB/T 7714 | Ding,S.,Xu,G.S.,Wang,Q.,et al. Scenario development for high βp low torque plasma with qmin above 2 and large-radius internal transport barrier in DIII-D[J]. Nuclear Fusion,2016,57. |
| APA | Ding,S..,Xu,G.S..,Wang,Q..,Solomon,W.M..,Zhao,Y..,...&Wan,B.N..(2016).Scenario development for high βp low torque plasma with qmin above 2 and large-radius internal transport barrier in DIII-D.Nuclear Fusion,57. |
| MLA | Ding,S.,et al."Scenario development for high βp low torque plasma with qmin above 2 and large-radius internal transport barrier in DIII-D".Nuclear Fusion 57(2016). |
入库方式： OAI收割
来源：合肥物质科学研究院
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