Low Threshold Parametric Decay Backscattering Instability in Tokamak Electron Cyclotron Resonance Heating Experiments

Journal Article · Fri Sep 10 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.115003· OSTI ID:21466952

Gusakov, E Z; Popov, A Yu ^[1]

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1. Ioffe Institute, St.-Petersburg (Russian Federation)

The experimental conditions leading to substantial reduction of the backscattering decay instability threshold in electron cyclotron resonance heating experiments in toroidal devices are analyzed. It is shown that a drastic decrease of threshold is provided by the nonmonotonic behavior of plasma density in the vicinity of magnetic island and poloidal magnetic field inhomogeneity making possible localization of ion Bernstein decay waves. The corresponding ion Bernstein wave gain and the parametric decay instability pump power threshold is calculated.

• OSTI ID: 21466952
• Journal Information: Physical Review Letters, Vol. 105, Issue 11; Other Information: DOI: 10.1103/PhysRevLett.105.115003; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BACKSCATTERING
BERNSTEIN MODE
DECAY INSTABILITY
ECR HEATING
IONS
MAGNETIC FIELDS
MAGNETIC ISLANDS
PLASMA DENSITY
PLASMA WAVES
TOKAMAK DEVICES
CHARGED PARTICLES
CLOSED PLASMA DEVICES
HEATING
HIGH-FREQUENCY HEATING
INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
OSCILLATION MODES
PLASMA HEATING
PLASMA INSTABILITY
SCATTERING
THERMONUCLEAR DEVICES