Progress in extending high poloidal beta scenarios on DIII-D towards a steady-state fusion reactor and impact of energetic particles

doi:10.1088/1741-4326/abaf33

	Progress in extending high poloidal beta scenarios on DIII-D towards a steady-state fusion reactor and impact of energetic particles
	Huang, J.2; Garofalo, A. M.1; Qian, J. P.2; Gong, X. Z.2; Ding, S. Y.2; Varela, J.3; Chen, J. L.2; Guo, W. F.2; Li, K.2; Wu, M. Q.7
刊名	NUCLEAR FUSION
	2020-12-01
卷号	60
关键词	tokamak steady state high bootstrap current energetic particle
ISSN号	0029-5515
DOI	10.1088/1741-4326/abaf33
通讯作者	Huang, J.(juan.huang@ipp.ac.cn)
英文摘要	To prepare for steady-state operation of future fusion reactors (e.g. the International Thermonuclear Experimental Reactor and China Fusion Engineering Test Reactor (CFETR)), experiments on DIII-D have extended the high poloidal beta (beta(P)) scenario to reactor-relevant edge safety factorq(95)similar to 6.0, while maintaining a large-radius internal transport barrier (ITB) using negative magnetic shear. Excellent energy confinement quality (H-98y2> 1.5) is sustained at high normalized beta (beta(N)similar to 3.5). This high-performance ITB state with Greenwald density fraction near 100% andq(min)>= 3 is achieved with toroidal plasma rotationV(tor)similar to 0 at rho >= 0.6. This is a key result for reactors expected to have lowV(tor). At high beta(P)(>= 1.9), large Shafranov shift can stabilize turbulence leading to a high confinement state with a low pedestal and an ITB. At lower beta(P)(<1.9), negative magnetic shear in the plasma core contributes to turbulence suppression and can compensate for reduced Shafranov shift to continue to access a large-radius ITB and excellent confinement with lowV(tor), consistent with the results of gyrofluid transport simulations. These high-beta(P)cases are characterized by weak/no Alfven eigenmodes (a.e.) and classical fast-ion transport. At high density, the fast-ion deceleration time decreases and Delta beta(fast)is lower; these reduce a.e. drive. The reverse-shear Alfven eigenmodes are weaker or stable because the negative magnetic shear region is located at higher radius, away from the peaked fast-ion profile. Resistive wall modes can be a limitation at simultaneous high beta(N), low internal inductance, and low rotation. Analysis suggests that additional off-axis external current drive could provide a more stable path at reducedq(95). Based on a DIII-D high-beta(P)plasma with large-radius ITB, two scenarios are proposed for CFETRQ= 5 steady-state operation with similar to 1 GW fusion power: a lower-li
资助项目	U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences[DE-FC02-04ER54698] ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences[DE-AC52-07NA27344] ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences[DE-FG02-08ER54999] ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences[DE-AC05-00OR22725] ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences[DE-FG02-08ER54984] ; National Natural Science Foundation of China[11975276] ; Anhui Provincial Natural Science Foundation[2008085J04]
WOS关键词	ALFVEN EIGENMODES
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000575503500001
资助机构	U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences ; National Natural Science Foundation of China ; Anhui Provincial Natural Science Foundation
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/104377]
专题	中国科学院合肥物质科学研究院
通讯作者	Huang, J.
作者单位	1.Gen Atom, San Diego, CA USA 2.Chinese Acad Sci, Inst Plasma Phys, Hefei, Anhui, Peoples R China 3.Univ Carlos III Madrid, Madrid 28911, Spain 4.Univ Calif Los Angeles, Los Angeles, CA USA 5.Univ Wisconsin, Madison, WI USA 6.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA 7.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China 8.Oak Ridge Associated Univ, Oak Ridge, TN USA
推荐引用方式 GB/T 7714	Huang, J.,Garofalo, A. M.,Qian, J. P.,et al. Progress in extending high poloidal beta scenarios on DIII-D towards a steady-state fusion reactor and impact of energetic particles[J]. NUCLEAR FUSION,2020,60.
APA	Huang, J..,Garofalo, A. M..,Qian, J. P..,Gong, X. Z..,Ding, S. Y..,...&Yan, Z..(2020).Progress in extending high poloidal beta scenarios on DIII-D towards a steady-state fusion reactor and impact of energetic particles.NUCLEAR FUSION,60.
MLA	Huang, J.,et al."Progress in extending high poloidal beta scenarios on DIII-D towards a steady-state fusion reactor and impact of energetic particles".NUCLEAR FUSION 60(2020).