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Title: Reflection and backscattering of microwaves under doubling of the plasma density and displacement of the gyroresonance region during electron cyclotron resonance heating of plasma in the l-2M stellarator

Abstract

Reflection and backscattering of high-power (400 kW) gyrotron radiation creating and heating plasma at the second harmonic of the electronic cyclotron frequency in the L-2M stellarator have been investigated experimentally. The effect of the displacement of the gyroresonance region from the axis of the plasma column under doubling of the plasma density on the processes of reflection and backscattering of microwave radiation has been examined. A near doubling of short-wavelength (k{sub ⊥} ≈ 30 cm{sup –1}) turbulent density fluctuations squared is observed. The change in the energy confinement time under variations of plasma parameters and characteristics of short-wavelength turbulence is discussed. A discrepancy between the measured values of the reflection coefficient from the electron cyclotron resonance heating region and predictions of the one-dimensional model is revealed.

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22614098
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 42; Journal Issue: 8; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BACKSCATTERING; CONFINEMENT TIME; ECR HEATING; FLUCTUATIONS; HARMONICS; MICROWAVE AMPLIFIERS; MICROWAVE RADIATION; ONE-DIMENSIONAL CALCULATIONS; PLASMA DENSITY; REFLECTION; STELLARATORS; TURBULENCE; WAVELENGTHS

Citation Formats

Batanov, G. M., Borzosekov, V. D., Vasilkov, D. G., Kolik, L. V., Konchekov, E. M., E-mail: konchekov@fpl.gpi.ru, Malakhov, D. V., Vafin, I. Yu., Petrov, A. E., Sarksyan, K. A., Sakharov, A. S., Stepakhin, V. D., and Kharchev, N. K. Reflection and backscattering of microwaves under doubling of the plasma density and displacement of the gyroresonance region during electron cyclotron resonance heating of plasma in the l-2M stellarator. United States: N. p., 2016. Web. doi:10.1134/S1063780X1608002X.
Batanov, G. M., Borzosekov, V. D., Vasilkov, D. G., Kolik, L. V., Konchekov, E. M., E-mail: konchekov@fpl.gpi.ru, Malakhov, D. V., Vafin, I. Yu., Petrov, A. E., Sarksyan, K. A., Sakharov, A. S., Stepakhin, V. D., & Kharchev, N. K. Reflection and backscattering of microwaves under doubling of the plasma density and displacement of the gyroresonance region during electron cyclotron resonance heating of plasma in the l-2M stellarator. United States. doi:10.1134/S1063780X1608002X.
Batanov, G. M., Borzosekov, V. D., Vasilkov, D. G., Kolik, L. V., Konchekov, E. M., E-mail: konchekov@fpl.gpi.ru, Malakhov, D. V., Vafin, I. Yu., Petrov, A. E., Sarksyan, K. A., Sakharov, A. S., Stepakhin, V. D., and Kharchev, N. K. Mon . "Reflection and backscattering of microwaves under doubling of the plasma density and displacement of the gyroresonance region during electron cyclotron resonance heating of plasma in the l-2M stellarator". United States. doi:10.1134/S1063780X1608002X.
@article{osti_22614098,
title = {Reflection and backscattering of microwaves under doubling of the plasma density and displacement of the gyroresonance region during electron cyclotron resonance heating of plasma in the l-2M stellarator},
author = {Batanov, G. M. and Borzosekov, V. D. and Vasilkov, D. G. and Kolik, L. V. and Konchekov, E. M., E-mail: konchekov@fpl.gpi.ru and Malakhov, D. V. and Vafin, I. Yu. and Petrov, A. E. and Sarksyan, K. A. and Sakharov, A. S. and Stepakhin, V. D. and Kharchev, N. K.},
abstractNote = {Reflection and backscattering of high-power (400 kW) gyrotron radiation creating and heating plasma at the second harmonic of the electronic cyclotron frequency in the L-2M stellarator have been investigated experimentally. The effect of the displacement of the gyroresonance region from the axis of the plasma column under doubling of the plasma density on the processes of reflection and backscattering of microwave radiation has been examined. A near doubling of short-wavelength (k{sub ⊥} ≈ 30 cm{sup –1}) turbulent density fluctuations squared is observed. The change in the energy confinement time under variations of plasma parameters and characteristics of short-wavelength turbulence is discussed. A discrepancy between the measured values of the reflection coefficient from the electron cyclotron resonance heating region and predictions of the one-dimensional model is revealed.},
doi = {10.1134/S1063780X1608002X},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 8,
volume = 42,
place = {United States},
year = {2016},
month = {8}
}