Excitation of beta-induced Alfven eigenmodes in the presence of a magnetic island

被引：48
作者：
Annibaldi, S. V. [1 ]
Zonca, F. [1 ]
Buratti, P. [1 ]
机构：
[1] EURATOM, ENEA, CR ENEA Frascati, I-00044 Frascati, Rome, Italy
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2007年 / 49卷 / 04期
关键词：
D O I：
10.1088/0741-3335/49/4/010
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：
Observation of magnetic activity in several discharges in the Frascati Tokamak Upgrade has revealed high-frequency oscillations that accompany the development of large magnetic islands in ohmic plasmas. The frequency of these oscillations is one order of magnitude above the typical island rotation frequency and one order of magnitude below the toroidicity-induced gap of the shear-Alfven continuum. By writing a precise dispersion relation, we interpret these modes as beta-induced Alfven eigenmodes, i.e. Alfven eigenmodes located in the low frequency gap which is caused by finite compressibility.
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页码：475 / 483
页数：9
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