ANALYSIS OF THEORETICAL PROBLEMS FOR ICRF HEATING IN TOKAMAKS
An analysis of theoretical problems for ion cyclotron heating in tokamaks is given. The wave propagation is studied using numerical methods to solve the global problem in which coupling of the wave to the antenna and propagation of the wave are treated in a self-consistent manner. Calculations are made in plane and toroidal geometries. In plane geometry the waves involved in the mode conversion problem can be described numerically whereas in the toroidal case only the corresponding resonance absorption problem can be treated. Mode conversion in toroidal plasmas is discussed for heating at the fundamental cyclotron resonance. The mode conversion surfaces are shown to be aligned along the magnetic surfaces. Focusing of the wave in a small aspect ratio tokamak plasma is shown to depend on the absorption coefficient. For minority heating of hydrogen in a deuterium plasma high energy tails are formed which makes finite gyroradius effects become important for the absorption. The calculated power transfer to the electrons as calculated is compared with that measured experimentally, and shows reasonable agreement between theory and experiments.
Bibliographic Reference: REPORT JET-P(87)08, 1987, AVAILABILITY: JET, ABINGDON, UK
Record Number: 1989126081400 / Last updated on: 1989-05-01
Available languages: en