A new sawtooth control mechanism relying on toroidally propagating ion cyclotron resonance frequency waves: Theory and Joint European Torus tokamak experimental evidence

被引：9

作者：

Graves, J. P. ^{[1
]}

Chapman, I. T. ^{[2
]}

Coda, S. ^{[1
]}

Johnson, T. ^{[3
]}

Lennholm, M. ^{[4
]}

机构：

[1] Ecole Polytech Fed Lausanne, Ctr Rech Phys Plasmas, Assoc EURATOM Confederat Suisse, CH-1015 Lausanne, Switzerland

[2] Euratom CCFE Fus Assoc, Culham Sci Ctr, Abingdon, Oxon, England

[3] Euratom VR Assoc, EES, KTH, SE-10044 Stockholm, Sweden

[4] EFDA JET CSU, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

来源：

PHYSICS OF PLASMAS | 2010年 / 17卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

kink instability; plasma radiofrequency heating; plasma toroidal confinement; sawtooth instability; Tokamak devices; CURRENT DRIVE; KINETIC-EQUATION; INTERNAL KINK; STABILIZATION; SAWTEETH; PLASMAS; RANGE; MODEL;

D O I：

10.1063/1.3363201

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 sawtooth control mechanism in plasmas employing toroidally propagating ion cyclotron resonance waves is extended. The asymmetrically distributed energetic passing ions are shown to modify the ideal internal kink mode when the position of the minority ion cyclotron resonance resides within a narrow region close to the q=1 surface. An analytical treatment of the internal kink mode in the presence of model distribution function with parallel velocity asymmetry is developed. The fast ion mechanism explains the strong sensitivity of sawteeth to resonance position, and moreover is consistent with dedicated Joint European Torus [F. Romanelli, Nucl. Fusion 49, 104006 (2009)] experiments which controlled sawteeth despite negligible current drive. [doi:10.1063/1.3363201]

引用

页数：16

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