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Kinetic effects are important in low-density high-power electron cyclotron resonance heating (ECRH) discharges, and the electron distribution function can significantly deviate from Maxwellian. In this paper the ECRH power deposition is analysed for perpendicular on-axis heating in W7-AS, with different magnetic configurations characterized by either a minimum or a maximum of B on the plasma axis in the RF injection plane. The different heating scenarios are modelled by means of a new bounce-averaged Fokker-Planck code, well suited for the magnetic field geometry close to the plasma axis of W7-AS.

The power deposition profile is estimated from the analysis of heat wave propagation stimulated by ECRH power modulation. In general, peaked deposition profiles as predicted from a ray-tracing code are obtained, but with an additional much broader contribution. Kinetic effects on the determination of the temperature both by Thomson scattering and by ECE diagnostics are briefly discussed. .

Additional information

Authors: ROMÉ M ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);MARUSHCHENKO N, Institute of Plasma Physics, Kharkov (UA);ROME M ET AL, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 39 (1997) No. 1, pp. 117-158
Record Number: 199710368 / Last updated on: 1997-04-23
Original language: en
Available languages: en