Sawtooth stabilization through island pressure enhancement
作者:
W. Park,
D. A. Monticello,
T. K. Chu,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1987)
卷期:
Volume 30,
issue 2
页码: 285-288
ISSN:0031-9171
年代: 1987
DOI:10.1063/1.866375
出版商: AIP
数据来源: AIP
摘要:
Using the compressible resistive magnetohydrodynamic (MHD) equations in a finite aspect ratio cylinder, it is found that them=1 mode (the sawtooth oscillation) can saturate when the pressure inside the magnetic island is higher than that of the original core plasma. The saturation condition is of the form &Dgr;&bgr;p≳8&egr;−1q=1(1−q0)2. This saturation effect can be used to actively stabilize sawteeth by heating or raising the density in the island. This mechanism, together with a stabilizing toroidal effect, may also explain recent lower‐hybrid wave‐driven tokamak experiments where the saturation of sawteeth has been observed.
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