Damping of radial electric field fluctuations in the TJ-II stellarator

被引：14

作者：

Velasco, J. L. ^{[1
]}

Alonso, J. A. ^{[1
]}

Calvo, I. ^{[1
]}

Arevalo, J. ^{[1
]}

Sanchez, E. ^{[1
]}

Eliseev, L. ^{[2
]}

Perfilov, S. ^{[2
]}

Estrada, T. ^{[1
]}

Lopez-Fraguas, A. ^{[1
]}

Hidalgo, C. ^{[1
]}

机构：

[1] Asociac EURATOM CIEMAT, Lab Nacl Fus, Madrid, Spain

[2] RNC Kurchatov Inst, Moscow, Russia

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2013年 / 55卷 / 12期

关键词：

VELOCITY SHEAR; TURBULENCE; TRANSPORT; PLASMAS; CONFINEMENT; CONFIGURATIONS; FLOWS;

D O I：

10.1088/0741-3335/55/12/124044

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 drift-kinetic equation is solved for low density TJ-II plasmas employing slowly varying, time-dependent profiles. This allows to simulate density ramp-up experiments and to describe from first principles the formation and physics of the radial electric field shear, which is associated to the transition from electron to ion root. We show that the range of frequencies of plasma potential fluctuations in which zonal flows are experimentally observed is neoclassically undamped in a neighbourhood of the transition. This makes the electron root regime of stellarators, close to the transition to ion root, a propitious regime for the study of zonal-flow evolution. We present simulations of collisionless relaxation of zonal flows, in the sense of the Rosenbluth and Hinton test, that show an oscillatory behaviour in qualitative agreement with the experiment close to the transition.

引用

页数：10

共 35 条

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