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

Journal Article · Mon Aug 15 04:00:00 EDT 2016 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X1608002X· OSTI ID:22614098

Batanov, G. M.; Borzosekov, V. D.; Vasilkov, D. G.; Kolik, L. V.; Malakhov, D. V.; Vafin, I. Yu.; Petrov, A. E.; Sarksyan, K. A.; Sakharov, A. S.; Stepakhin, V. D.; Kharchev, N. K. ^[1]

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1. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)

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.

• OSTI ID: 22614098
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 8 Vol. 42; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

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