On a New Mechanism of Excitation of the Absolute Parametric Decay Instability of an Electromagnetic Wave in Experiments on Electron Cyclotron Resonance Heating in Toroidal Devices

被引：28

作者：

Popov, A. Yu. ^{[1
]}

Gusakov, E. Z. ^{[1
]}

机构：

[1] Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia

来源：

JETP LETTERS | 2017年 / 105卷 / 02期

基金：

俄罗斯科学基金会;

关键词：

TOKAMAKS;

D O I：

10.1134/S0021364017020138

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Experimental conditions under which the low-threshold absolute parametric decay instability of an electromagnetic wave with extraordinary polarization at the electron cyclotron resonance heating of a plasma at the second harmonic resonance in toroidal devices are analyzed. A new mechanism is proposed for the localization of a daughter electrostatic wave in the toroidal direction in the region of a high-power pump beam. This mechanism, along with the two-dimensional localization of the daughter wave because of a nonmonotonic radial profile of the plasma density and the poloidal inhomogeneity of the magnetic field, can be responsible for the parametric excitation of a three-dimensional cavity for this wave and, as a result, low-threshold absolute decay instability of the pump wave.

引用

页码：78 / 82

页数：5

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