Investigation of gas puff induced fluctuation suppression in ADITYA tokamak

被引：27
作者：
Jha, R. [1 ]
Sen, A. [1 ]
Kaw, P. K. [1 ]
Atrey, P. K. [1 ]
Bhatt, S. B. [1 ]
Bisai, N. [1 ]
Tahiliani, K. [1 ]
Tanna, R. L. [1 ]
机构：
[1] Inst Plasma Res, Bhat 382428, Gandhinagar, India
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2009年 / 51卷 / 09期
关键词：
STATIONARY PLASMA ENERGY; STRONG EDGE RADIATION; H-MODE; HIGH CONFINEMENT; REYNOLDS STRESS; HIGH-DENSITY; DIII-D; TRANSPORT; TURBULENCE; DISCHARGES;
D O I：
10.1088/0741-3335/51/9/095010
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：
An experiment aimed at investigating the cause of fluctuation suppression by gas puffing in the edge and scrape-off layer plasma of the ADITYA tokamak is reported. The fluctuation suppression is accompanied by a flattening of the radial profiles of the floating potential, plasma density and electrostatic Reynolds stress. Both the fluctuation suppression and the simultaneous reduction in particle flux occur throughout the observed region of the plasma edge. The bolometer data also show an increase in the edge radiation from 20% to 40% of the input power during the gas puff. These results indicate a significant role of edge cooling in the fluctuation suppression mechanism and are shown to be well explained in terms of a concomitant reduction in the growth rate of the interchange instability associated with the electron temperature gradient.
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页数：17
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