skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Parametric Mechanism of Anomalous Microwave Power Absorption in Experiments on Electron Cyclotron Heating in Toroidal Magnetic Traps

Abstract

The nonlinear stage of the parametric decay instability of an extraordinary wave is analyzed in the presence of a nonmonotonic density profile. The decay excites an electron Bernstein wave, which is localized in the vicinity of a local density maximum, and an ion Bernstein wave, which leaves a nonlinear interaction region and is absorbed by ions in the vicinity of the harmonics of the ion cyclotron frequency. The main mechanism of instability saturation is considered to be a cascade of decays of a primary daughter electron Bernstein wave, which leads to the excitation of localized secondary electron Bernstein waves and ion cyclotron (Bernstein) waves. The localization of electron Bernstein waves causes a significant decrease in the secondary- decay excitation threshold, which is thought to provide saturation of the primary instability at the lowest level. The saturation of the primary parametric decay instability of a pump wave and the anomalous absorption of the pump power are analytically estimated. A numerical simulation is performed using the parameters that are typical of the experiments on the electron cyclotron resonance heating of plasma at the second resonance harmonic in TCV tokamak.

Authors:
;  [1]
  1. Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22749784
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 127; Journal Issue: 1; Other Information: Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; BERNSTEIN MODE; COMPUTERIZED SIMULATION; CYCLOTRON FREQUENCY; DECAY INSTABILITY; ECR HEATING; ELECTRON CYCLOTRON-RESONANCE; EXCITATION; ION WAVES; MICROWAVE RADIATION; NONLINEAR PROBLEMS; TCV TOKAMAK

Citation Formats

Gusakov, E. Z., E-mail: evgeniy.gusakov@mail.ioffe.ru, and Popov, A. Yu., E-mail: a.popov@mail.ioffe.ru. Parametric Mechanism of Anomalous Microwave Power Absorption in Experiments on Electron Cyclotron Heating in Toroidal Magnetic Traps. United States: N. p., 2018. Web. doi:10.1134/S1063776118070063.
Gusakov, E. Z., E-mail: evgeniy.gusakov@mail.ioffe.ru, & Popov, A. Yu., E-mail: a.popov@mail.ioffe.ru. Parametric Mechanism of Anomalous Microwave Power Absorption in Experiments on Electron Cyclotron Heating in Toroidal Magnetic Traps. United States. doi:10.1134/S1063776118070063.
Gusakov, E. Z., E-mail: evgeniy.gusakov@mail.ioffe.ru, and Popov, A. Yu., E-mail: a.popov@mail.ioffe.ru. Sun . "Parametric Mechanism of Anomalous Microwave Power Absorption in Experiments on Electron Cyclotron Heating in Toroidal Magnetic Traps". United States. doi:10.1134/S1063776118070063.
@article{osti_22749784,
title = {Parametric Mechanism of Anomalous Microwave Power Absorption in Experiments on Electron Cyclotron Heating in Toroidal Magnetic Traps},
author = {Gusakov, E. Z., E-mail: evgeniy.gusakov@mail.ioffe.ru and Popov, A. Yu., E-mail: a.popov@mail.ioffe.ru},
abstractNote = {The nonlinear stage of the parametric decay instability of an extraordinary wave is analyzed in the presence of a nonmonotonic density profile. The decay excites an electron Bernstein wave, which is localized in the vicinity of a local density maximum, and an ion Bernstein wave, which leaves a nonlinear interaction region and is absorbed by ions in the vicinity of the harmonics of the ion cyclotron frequency. The main mechanism of instability saturation is considered to be a cascade of decays of a primary daughter electron Bernstein wave, which leads to the excitation of localized secondary electron Bernstein waves and ion cyclotron (Bernstein) waves. The localization of electron Bernstein waves causes a significant decrease in the secondary- decay excitation threshold, which is thought to provide saturation of the primary instability at the lowest level. The saturation of the primary parametric decay instability of a pump wave and the anomalous absorption of the pump power are analytically estimated. A numerical simulation is performed using the parameters that are typical of the experiments on the electron cyclotron resonance heating of plasma at the second resonance harmonic in TCV tokamak.},
doi = {10.1134/S1063776118070063},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 1,
volume = 127,
place = {United States},
year = {2018},
month = {7}
}