Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas

doi:10.1103/PhysRevLett.123.225002

HFCAS OpenIR

	Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas
	Jian, X.1; Holland, C.1; Candy, J.2; Belli, E.2; Chan, V.2; Garofalo, A. M.2; Ding, S.3,4
	2019-11-26
发表期刊	PHYSICAL REVIEW LETTERS
ISSN	0031-9007
通讯作者	Jian, X.(xijian@ucsd.edu)
摘要	We report on the first direct comparisons of microtearing turbulence simulations to experimental measurements in a representative high bootstrap current fraction (f(BS)) plasma. Previous studies of high f(BS) plasmas carried out in DIII-D with large radius internal transport barriers (ITBs) have found that, while the ion energy transport is accurately reproduced by neoclassical theory, the electron transport remains anomalous and not well described by existing quasilinear transport models. A key feature of these plasmas is the large value of the normalized pressure gradient, which is shown to completely stabilize conventional drift-wave and kinetic ballooning mode instabilities in the ITB, but destabilizes the microtearing mode. Nonlinear gyrokinetic simulations of the ITB region performed with the CGYRO code demonstrate that the microtearing modes are robustly unstable and capable of driving electron energy transport levels comparable to experimental levels for input parameters consistent with the experimental measurements. These simulations uniformly predict that the microtearing mode fluctuation and flux spectra extend to significantly shorter wavelengths than the range of linear instability, representing significantly different nonlinear dynamics and saturation mechanisms than conventional drift-wave turbulence, which is also consistent with the fundamental tearing nature of the instability. The predicted transport levels are found to be most sensitive to the magnetic shear, rather than the temperature gradients more typically identified as driving turbulent plasma transport.
DOI	10.1103/PhysRevLett.123.225002
关键词[WOS]	ARBITRARY COLLISIONALITY ; KINETIC-THEORY ; TRANSPORT ; CONFINEMENT ; SIMULATIONS ; MODE
收录类别	SCI
语种	英语
资助项目	U.S. Department of Energy[DE-SC0018287] ; U.S. Department of Energy[DE-SC0017992] ; U.S. Department of Energy[DE-FG02-95ER54309] ; U.S. Department of Energy[DE-FC02-04ER54698] ; National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility[DE-AC02-05CH11231]
项目资助者	U.S. Department of Energy ; National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000499987900013
出版者	AMER PHYSICAL SOC
引用统计	被引频次：27[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/105058
专题	中国科学院合肥物质科学研究院
通讯作者	Jian, X.
作者单位	1.Univ Calif San Diego, La Jolla, CA 92093 USA 2.Gen Atom, POB 85608, San Diego, CA 92186 USA 3.Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA 4.Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Jian, X.,Holland, C.,Candy, J.,et al. Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas[J]. PHYSICAL REVIEW LETTERS,2019,123.
APA	Jian, X..,Holland, C..,Candy, J..,Belli, E..,Chan, V..,...&Ding, S..(2019).Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas.PHYSICAL REVIEW LETTERS,123.
MLA	Jian, X.,et al."Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas".PHYSICAL REVIEW LETTERS 123(2019).