A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST

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	A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST
其他题名	A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST
	2011
发表期刊	PLASMA SCIENCE & TECHNOLOGY
ISSN	1009-0630
摘要	Ion's toroidal velocity, v(t), in both the outermost 4 cm of the confined region and the scrap-off layer of Ohmic L-mode plasmas in EAST was measured using Mach probes. At about 1 cm inside the separatrix a local minimum in v(t) was observed, from which a cocurrent rotation increased both inwards and outwards. The radial width of the -v(t) dip was 1 cm to 2 cm, and both the density and electron temperature profiles exhibited steep gradients at this dip position. It was observed in both divertor and limiter configurations. To find out its origin, the toroidal torques induced by neutral friction, neoclassical viscosity, collisional perpendicular shear viscosity, ion orbit loss and turbulent Reynolds stress were estimated using the measured parameters. Our results indicate that in this particular parameter regime the neutral friction was the dominant damping force. The calculated cocurrent toroidal torque by the neoclassical viscosity dominates over those from the collisional perpendicular shear viscosity, ion orbit loss and turbulent Reynolds stress. These results are potentially important for the understanding of boundary conditions for the intrinsic toroidal momentum in tokamak plasmas.
其他摘要	Ion's toroidal velocity,vt,in both the outermost 4 cm of the confined region and the scrap-off layer of Ohmic L-mode plasmas in EAST was measured using Mach probes.At about 1 cm inside the separatrix a local minimum in vt was observed,from which a cocurrent rotation increased both inwards and outwards.The radial width of the vt dip was 1 cm to 2 cm,and both the density and electron temperature profiles exhibited steep gradients at this dip position.It was observed in both divertor and limiter configurations.To find out its origin,the toroidal torques induced by neutral friction,neoclassical viscosity,collisional perpendicular shear viscosity,ion orbit loss and turbulent Reynolds stress were estimated using the measured parameters.Our results indicate that in this particular parameter regime the neutral friction was the dominant damping force.The calculated cocurrent toroidal torque by the neoclassical viscosity dominates over those from the collisional perpendicular shear viscosity,ion orbit loss and turbulent Reynolds stress.These results are potentially important for the understanding of boundary conditions for the intrinsic toroidal momentum in tokamak plasmas.
关键词	H-MODE TRANSITION ION ORBIT LOSS TOKAMAK PLASMA ELECTRIC-FIELD TRANSPORT CONFINEMENT TURBULENCE BOUNDARY SYSTEMS DRIVEN intrinsic rotation turbulent Reynolds stress toroidal torques neutral friction
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [ITER project of China]
CSCD记录号	CSCD:4309828
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/51648
专题	中国科学院合肥物质科学研究院
推荐引用方式 GB/T 7714	. A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST[J]. PLASMA SCIENCE & TECHNOLOGY,2011,13.
APA	(2011).A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST.PLASMA SCIENCE & TECHNOLOGY,13.
MLA	"A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST".PLASMA SCIENCE & TECHNOLOGY 13(2011).