Transformations of kinetic Alfven waves in toroidal plasmas

被引：1
作者：
Tyshchenko, M. H. [1 ]
Yakovenko, Yu V. [1 ,2 ]
机构：
[1] Inst Nucl Res, UA-03680 Kiev, Ukraine
[2] Univ KwaZulu Natal, Kyiv Mohyla Acad, UA-04070 Kiev, Ukraine
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2012年 / 54卷 / 06期
关键词：
EIGENMODES; STELLARATORS; EXCITATION; CONTINUUM;
D O I：
10.1088/0741-3335/54/6/065002
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：
It is demonstrated that toroidicity (as well as ellipticity and other kinds of deviations of the magnetic configuration from the cylindrical geometry) can result in linear transformations of propagating kinetic Alfven waves (KAWs) into other KAW branches, which differ by their mode numbers from the initial waves. Analytical expressions for the amplitudes of the transformed and non-transformed waves are derived. The transformation is found to be strong for waves with low poloidal mode numbers in typical present-day tokamaks. It may affect the mode numbers observed by external magnetic measurements and weaken the Landau damping of the waves, thus extending the region of the wave propagation.
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页数：7
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