NONLINEAR COUPLING OF THE LOWER HYBRID GRILL IN ASDEX

被引:58
作者
PETRZILKA, VA [1 ]
LEUTERER, F [1 ]
SOLDNER, FX [1 ]
GIANNONE, L [1 ]
SCHUBERT, R [1 ]
机构
[1] EURATOM IPP ASSOC, MAX PLANCK INST PLASMAPHYS, GARCHING, GERMANY
关键词
D O I
10.1088/0029-5515/31/9/014
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
Computations of the reflection coefficient based on a non-linear lower hybrid (LH) coupling theory are presented and compared with the measurements of the reflection coefficient of the ASDEX tokamak LH grill, where powers up to 4 kW/cm2 have been launched. This high LH power density modifies the electron density in front of the grill because of ponderomotive forces. Thus, the coupling and the power reflection coefficient change. To explain the observed saturation of the growth of the reflection coefficient with power, it is necessary to take into account some heating of the plasma in front of the grill by the transmitted LH power, which also leads to a poloidally inhomogeneous edge electron density.
引用
收藏
页码:1758 / 1767
页数:10
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