Study of microinstabilities in toroidal plasmas with negative magnetic shear

被引：23

作者：

Dong, JQ

Zhang, YZ

Mahajan, SM

Guzdar, PN

机构：

[1] UNIV TEXAS, INST FUS STUDIES, AUSTIN, TX 78712 USA

[2] UNIV MARYLAND, INST PLASMA RES, COLLEGE PK, MD 20742 USA

[3] SW INST PHYS, CHENGDU, PEOPLES R CHINA

来源：

PHYSICS OF PLASMAS | 1996年 / 3卷 / 08期

关键词：

D O I：

10.1063/1.871654

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The microinstabilities driven by a parallel velocity shear, and a temperature gradient of ions are studied in toroidal plasmas with negative magnetic shear. Both the fluid and the gyrokinetic formulations are investigated. It is found that for a broad range of parameters, the linear growth rates of the modes are lower and the threshold temperature gradient eta(icr) is higher for plasmas with negative magnetic shear compared to plasmas with positive magnetic shear of equal magnitude. The reduction in the growth rate (with negative shear), although not insignificant, does not seem to be enough to account for the dramatic improvement in the confinement observed experimentally. Other possible physical mechanisms for the improved confinement are discussed. (C) 1996 American Institute of Physics.

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页码：3065 / 3072

页数：8

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