Microwave absorption in stellarators with a non-Maxwellian electron distribution function
- Asociacion EURATOM-CIEMAT para la Fusion, Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (C.I.E.M.A.T.), 28040 Madrid, Spain (ES)
The magnetic configurations of two stellarators, ATF (Fusion Technol. {bold 10}, 170 (1986)) and TJ-II (Fusion Technol. {bold 13}, 315 (1986)), are used as examples to study the influence that a superthermal component in the electron distribution function has upon the electron cyclotron resonance heating absorption process for microwaves propagating in the first and second harmonic of the electron cyclotron frequency. The non-Maxwellian tail is simulated by adding a drifting Maxwellian to a bulk distribution function and an analytical form of the weakly relativistic dielectric tensor is obtained. The quantitative, and more importantly, the qualitative differences between nonrelativistic and relativistic models are also presented. A numerical analysis shows that an increase of up to 50% in the absorption power with respect to the pure Maxwellian models, can be obtained if sufficient superthermal populations are present in the plasma.
- OSTI ID:
- 5350118
- Journal Information:
- Physics of Fluids B: Plasma Physics; (USA), Journal Name: Physics of Fluids B: Plasma Physics; (USA) Vol. 1:11; ISSN 0899-8221; ISSN PFBPE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ABSORPTION
CLOSED PLASMA DEVICES
DISTRIBUTION FUNCTIONS
ECR HEATING
ELECTROMAGNETIC RADIATION
FUNCTIONS
HARMONICS
HEATING
HIGH-FREQUENCY HEATING
MAGNETIC FIELD CONFIGURATIONS
MATHEMATICS
MICROWAVE RADIATION
NUMERICAL ANALYSIS
OSCILLATIONS
PLASMA
PLASMA HEATING
RADIATIONS
STELLARATORS
THERMONUCLEAR DEVICES