Measurement of edge parameters in the HL-2A tokamak

Abstract

Abstract:

Experimental results of plasma characteristics in several discharges have been obtained in the plasma boundary region of the HL-2A tokamak using a multi- array of Mach/ Reynolds stress/ Langmuir 10 probes. A Mach/ Langmuir 10 probe array assembly is mounted on a long shaft, which can be moved radially inboard and outboard, which can be rotated for 360^o . They have been used to measure the plasma electron temperature, density, poloidal electric field, radial electric field, Reynolds stress, poloidal rotation velocities and radial profiles in the plasma boundary region of the HL-2A tokamak. The experimental results suggest that the confinement improvement is related to the increasing rotation velocity and to the decreasing edge fluctuation. The results indicate that sheared poloidal flows can be generated in tokamak plasma due to the radially varying Reynolds stress. Zonal flows can be driven by the radial gradient of the Reynolds stress.

Key words: HL-2A tokamak, Movable 10 probe array, Zonal flows

摘要：

HL-2A 装置中平面边缘的等离子体特性通过磁力传动的马赫/ 雷诺协强/ 朗缪尔10 探针组进行了研究。10 探针组安装在可径向向里和向外移动, 并可绕轴旋转360^o 的传动杆上, 用于测量主等离子体边缘的温度、密度、悬浮电位、空间电位、径向和极向电场、湍流的雷诺协强、径向和极向等离子体流速及其径向分布。HL- 2A 装置的实验结果表明, 边缘等离子体扰动诱发的雷诺协强产生了边缘极向流; 雷诺协强的径向梯度驱动带状流抑制了湍流输运。

关键词: HL-2A 装置, 活动10 探针组, 带状流

CLC Number:

TL65+ 6

HONG Wen-yu, YAN Long-wen, WANG En-yao , PAN Yu-dong,QIAN Jun, LI Wei, CUI Zheng-ying, LUO Cui- wen. Measurement of edge parameters in the HL-2A tokamak[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2005, 25(3): 168-172.

洪文玉, 严龙文, 王恩耀, 潘宇东,钱俊, 李伟, 崔正英, 罗萃文. HL-2A 装置的边缘参数测量[J]. 核聚变与等离子体物理, 2005, 25(3): 168-172.

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