Simulation of EBW Heating in WEGA
- EURATOM/IPP.CR Association, Institute of Plasma Physics, 182 21 Prague (Czech Republic)
- Max-Plank Institut fur Plasmaphysik, EURATOM Ass., D-17491, Greifswald (Germany)
- Old Dominion University, Norfolk, VA 23529 (United States)
Discharges in the WEGA stellarator are sustained exclusively by 2.45 GHz RF heating. Plasma density is typically above the critical density so only electron Bernstein waves (EBW) can propagate inside the plasma. Experiments show a dependence on the magnitude of the magnetic field that points to resonant wave damping at 2.45GHz. EBW propagation has been simulated with O-X-EBW conversion efficiency and ray-tracing calculations, showing possible mechanisms for the experimental results. Growth of the parallel wave number up to {approx}30, along with the characteristic admixture of energetic electrons produced by the RF heating, allows for strong resonant absorption at the Doppler shift electron cyclotron (EC) resonance. Thus, the deposition region shifts with changes in the magnitude of the magnetic field. Our modeling also predicts that the experimentally designed antenna should drive a substantial current.
- OSTI ID:
- 21035881
- Journal Information:
- AIP Conference Proceedings, Vol. 933, Issue 1; Conference: 17. topical conference on radio frequency power in plasmas, Clearwater, FL (United States), 7-9 May 2007; Other Information: DOI: 10.1063/1.2800506; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ANTENNAS
BERNSTEIN MODE
CONVERSION
DAMPING
DOPPLER EFFECT
ELECTRIC CURRENTS
ENERGY LOSSES
GHZ RANGE
MAGNETIC FIELDS
PLASMA
PLASMA DENSITY
PLASMA HEATING
PLASMA SIMULATION
PLASMA WAVES
RESONANCE
RF SYSTEMS
TAIL ELECTRONS
TOKAMAK DEVICES
WEGA STELLARATOR