Frequency sweeping Alfven instabilities driven by super-Alfvenic beams in the spherical tokamak START

被引：27

作者：

Gryaznevich, MP ^{[1
]}

Sharapov, SE

机构：

[1] EURATOM, UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon, Oxon, England

[2] Jet Joint Undertaking, Abingdon OX14 3EA, Oxon, England

来源：

NUCLEAR FUSION | 2000年 / 40卷 / 05期

关键词：

D O I：

10.1088/0029-5515/40/5/303

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：

Alfven instabilities with rapidly decreasing frequency are observed in experiments with super-Alfvenic (up to V-beam/V-A congruent to 3) NBI in the spherical tokamak START (Culham Science Centre, UK). The unstable modes appear as high frequency, f(0) congruent to 70-400 kHz, 'bursts' detected by magnetic pick-up coils and soft X ray cameras, and 'sweep' down by a factor of two in frequency in a single 0.2-0.3 ms burst. A strong correlation between the initial frequency of the frequency sweeping modes f(0) and the parameter VA beta(T)(-3/4), where V-A is the Alfven velocity and pr the toroidal beta, is found.

引用

页码：907 / 912

页数：6

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