Macroscopic stability of high β MAST plasmas

被引：42

作者：

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

Cooper, W. A. ^{[2
]}

Graves, J. P. ^{[2
]}

Gryaznevich, M. P. ^{[1
]}

Hastie, R. J. ^{[1
]}

Hender, T. C. ^{[1
]}

Howell, D. F. ^{[1
]}

Hua, M. -D. ^{[1
,3
]}

Huysmans, G. T. A. ^{[4
]}

Keeling, D. L. ^{[1
]}

Liu, Y. Q. ^{[1
]}

Meyer, H. F. ^{[1
]}

Michael, C. A. ^{[1
]}

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

Saarelma, S. ^{[1
]}

Sabbagh, S. A. ^{[5
]}

机构：

[1] Culham Sci Ctr, Euratom CCFE Fus Assoc, Abingdon OX14 3DB, Oxon, England

[2] Ecole Polytech Fed Lausanne, Assoc EURATOM Confederat Suisse, CRPP, CH-1015 Lausanne, Switzerland

[3] Univ London Imperial Coll Sci Technol & Med, London SW7 2BY, England

[4] Assoc Euratom CEA, CEA Cadarache, F-13108 St Paul Les Durance, France

[5] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY USA

来源：

NUCLEAR FUSION | 2011年 / 51卷 / 07期

关键词：

INTERNAL KINK MODES; X-POINT GEOMETRY; DIII-D; FIELD AMPLIFICATION; TOKAMAK PLASMAS; MHD STABILITY; WALL MODES; STABILIZATION; ROTATION; IDEAL;

D O I：

10.1088/0029-5515/51/7/073040

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 high-beta capability of the spherical tokamak, coupled with a suite of world-leading diagnostics on MAST, has facilitated significant improvements in the understanding of performance-limiting core instabilities in high performance plasmas. For instance, the newly installed motional Stark effect diagnostic, with radial resolution < 25 mm, has enabled detailed study of saturated long-lived modes in hybrid scenarios. Similarly, the upgraded Thomson scattering system, with radial resolution < 10mm and the possibility of temporal resolution of 1 mu s, has allowed detailed analysis of the density and temperature profiles during transient activity in the plasma, such as at a sawtooth crash. High resolution charge exchange recombination spectroscopy provided measurement of rotation braking induced by both applied magnetic fields and by magnetohydrodynamic (MHD) instabilities, allowing tests of neoclassical toroidal viscosity theory predictions. Finally, MAST is also equipped with internal and external coils that allow non-axisymmetric fields to be applied for active MHD spectroscopy of instabilities near the no-wall beta limit. MAST has been able to operate above the pressure at which the resonant field amplification is observed to strongly increase. In order to access such high pressures, the resistive wall mode must be damped, and so numerical modelling has focused on assessing the kinetic damping of the mode and its nonlinear interaction with other instabilities. The enhanced understanding of the physical mechanisms driving deleterious MHD activity given by these leading-edge capabilities has provided guidance to optimize operating scenarios for improved plasma performance.

引用

页数：12

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