Effect of impurities on collisional zonal flow damping in tokamaks

被引：15
|
作者：
Braun, S. [1 ]
Helander, P. [1 ]
Belli, E. A. [2 ]
Candy, J. [2 ]
机构：
[1] EURATOM, Teilinst Greifswald, Max Planck Inst Plasmaphys, D-17491 Greifswald, Germany
[2] Gen Atom Co, San Diego, CA 92186 USA
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2009年 / 51卷 / 06期
关键词：
NEOCLASSICAL TRANSPORT; TURBULENCE SIMULATIONS; DRIVEN; PLASMA;
D O I：
10.1088/0741-3335/51/6/065011
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：
It is shown that the presence of highly charged impurity ions strongly increases the collisional damping of zonal flows in a low-collisionality tokamak plasma. A formula for the zonal flow damping time is derived, which indicates that the damping is enhanced approximately by a factor Z(eff). If the aspect ratio is large, the enhancement is significantly larger. The zonal flow damping time is also the time which the poloidal plasma rotation needs to respond to a sudden change in the pressure gradients.
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页数：17
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