UHF REFLECTOMETRY STUDY OF THE PLASMA OSCILLATIONS ARISING DURING RF HEATING IN URAGAN-3M TORSATRON

摘要

Perturbations induced in plasma by powerful electromagnetic (EM) waves influence the propagation of other waves in the perturbed region. In Uragan-3M torsatron one or two high-power waves are used for plasma production and heating. Powerful RF waves excite of the different types of plasma fluctuations. The results of study of two kinds of oscillations caused by Alfven waves in plasma are presented in this work. These oscillations were observed by microwave reflectometry. Spectral analysis of reflected microwaves showed an existence of plasma density fluctuations with frequency Δf = f{sub}1 - f{sub}2, when two heating waves were used simultaneously. Also an attempt is made to search of manifestation of ion Bernstein waves predicted in [1]. Such waves manifested themselves as plasma density fluctuations and have been observed by backscattering of microwave in vicinity of ion gyrofrequency harmonics n·f{sub}(ci).