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

ISSN号：1009-0630
期刊名称：《等离子体科学与技术：英文版》
时间：0
分类：TL631.24[核科学技术—核技术及应用] TN929.5[电子电信—通信与信息系统;电子电信—信息与通信工程]
作者机构：[1]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China, [2]Association Euratom-RisФ DTU, DK-4000 Roskilde, Denmark, [3]Tri Alpha Energy, P.O. Box 7010, Rancho Santa Margarita, CA 92688, USA, [4]Plasma Physics Laboratory, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada
相关基金：supported by National Natural Science Foundation of China （Nos. 11075181, 10725523, 10721505, 10990212 and 10605028） and the ITER project of China （No. 2010GB104001）

作者：徐国盛[1], V. NAULIN[2], 万宝年[1], 郭后扬[3], 张炜[1], 常加峰[1], 颜宁[1], 丁斯晔[1], 张凌[1], 王亮[1], 刘少承[1], 刘鹏[1], 蒋敏[1], 汪惠乾[1], J. Juul RASMUSSEN[2], A. H. NIELSEN[2], 肖持进[4], 高翔[1], 胡立群[1], 朱思铮[1], 吴振伟[1], 钱金平[1], 龚先祖[1]

关键词：等离子体边缘, 环形, IP结构, 旋转, 欧姆, 托卡马克等离子体, 新古典主义, 剪切粘度, intrinsic rotation, turbulent Reynolds stress, toroidal torques, neutral friction

中文摘要：

<正> Ion’s toroidal velocity,v_t,in both the outermost 4 cm of the confined region and thescrap-off layer of Ohmic L-mode plasmas in EAST was measured using Mach probes.At about1 cm inside the separatrix a local minimum in v_t was observed,from which a cocurrent rotationincreased both inwards and outwards.The radial width of the v_t dip was 1 cm to 2 cm,andboth 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 toroidaltorques induced by neutral friction,neoclassical viscosity,collisional perpendicular shear viscosity,ion orbit loss and turbulent Reynolds stress were estimated using the measured parameters.Ourresults indicate that in this particular parameter regime the neutral friction was the dominantdamping force.The calculated cocurrent toroidal torque by the neoclassical viscosity dominatesover those from the collisional perpendicular shear viscosity,ion orbit loss and turbulent Reynoldsstress.These results are potentially important for the understanding of boundary conditions forthe intrinsic toroidal momentum in tokamak plasmas.

英文摘要：

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.

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