Geodesic acoustic mode induced by toroidal rotation in tokamaks

被引：62
|
作者：
Wahlberg, C. [1 ]
机构：
[1] Uppsala Univ, Dept Phys & Astron, EURATOM, VR Fus Assoc, SE-75120 Uppsala, Sweden
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 11期
基金：
瑞典研究理事会;
关键词：
D O I：
10.1103/PhysRevLett.101.115003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The effect of toroidal rotation on the geodesic acoustic mode (GAM) in a tokamak is studied. It is shown that, in addition to a small frequency upshift of the ordinary GAM, another GAM, with much lower frequency, is induced by the rotation. The new GAM appears as a consequence of the nonuniform plasma density and pressure created by the centrifugal force on the magnetic surfaces. Both GAMs in a rotating plasma are shown to exist both as continuum modes with finite mode numbers m and n at the rational surfaces q = m/n as well as in the form of axisymmetric modes with m = n = 0.
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页数：4
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