Sawtooth control using off-axis NBI

被引：31

作者：

Chapman, I. T. ^{[1
]}

Jenkins, I. ^{[1
]}

Budny, R. V. ^{[2
]}

Graves, J. P. ^{[3
]}

Pinches, S. D. ^{[1
]}

Saarelma, S. ^{[1
]}

机构：

[1] UKAEA Fus Assoc, EURATOM, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[2] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[3] CRPP, Assoc EURATOM Confed Suisse, EFPL, Lausanne, Switzerland

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2008年 / 50卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1088/0741-3335/50/4/045006

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 has previously been observed that neo-classical tearing modes can be triggered by long period sawteeth even at low values of beta. Since fusion-born a particles are predicted to invoke long period sawteeth, mechanisms to control sawteeth are important for ITER. Here, sawtooth behaviour in off-axis neutral beam injection (NBI) heated plasmas in JET is presented. It is found that the off-axis NBI can be used to destabilize sawteeth even in discharges with concurrent stabilizing on-axis neutral beams. Drift kinetic modelling of such discharges qualitatively shows that the passing fast ions born due to the NBI determine the stability of the n = 1 internal kink mode, thought to be related to sawtooth oscillations. In particular, when the beam ions are deposited outside the q = 1 surface, they can result in more frequent sawteeth. It is proposed that off-axis neutral beams could be used as an actuator for sawtooth control in ITER. Provided that the q = 1 surface is sufficiently core localized, the strongly passing population induced by the negative-ion NBI planned for ITER may be able to significantly destabilize the sawteeth.

引用

页数：15

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