Scattering theory of strongly refracting microwaves in turbulent inhomogeneous plasma. Applications of the theory to the description of fluctuation reflectometry in thermonuclear fusion devices

被引：3
作者：
Gusakov, E. Z. [1 ]
Popov, A. Yu [1 ]
机构：
[1] Ioffe Inst, Ul Politekhnicheskaya 26, St Petersburg 194021, Russia
来源：
PHYSICS-USPEKHI | 2020年 / 63卷 / 11期
基金：
俄罗斯基础研究基金会;
关键词：
microwave scattering; fluctuation reflectometry; drift turbulence; low-frequency density fluctuation; toroidal device; thermonuclear fusion; UPPER HYBRID-RESONANCE; CROSS-POLARIZATION SCATTERING; SMALL-ANGLE SCATTERING; DENSITY-FLUCTUATIONS; ELECTROMAGNETIC-WAVES; BRAGG BACKSCATTERING; EXTRAORDINARY WAVE; NONLINEAR-THEORY; DIAGNOSTICS; SPECTRUM;
D O I：
10.3367/UFNe.2020.08.038813
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present the theory of propagation and scattering of strongly refracting microwaves in turbulent inhomogeneous plasmas. We calculate the scattered signal amplitude in the case of a linear scattering regime in the Born approximation and in the case of multiple small-angle scattering. We discuss the possibility of an analytic description of multiple Bragg back-scattering in a closed form. Based on the results of a theoretical analysis of microwave scattering regimes in inhomogeneous turbulent plasmas, we discuss the main fluctuation reflectometry schemes that are broadly used in toroidal thermonuclear fusion devices to analyze turbulence characteristics. We describe the methods for interpreting experimental data and the experimental approaches relying on reflectometry diagnostics that enhance the locality of measurements and their resolution with respect to the wave vectors of fluctuations.
引用
收藏
页码：1114 / 1139
页数：26
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