COUPLING PROPERTIES OF ALTERNATIVE DESIGNS FOR LAUNCHING ICRF WAVES
During the past few years, ICRH proved to be an efficient and flexible way of heating plasmas. Although the conventional loop antennas that have been used up to now give satisfactory results, technological reasons argue for their replacement by launching structures more adapted to the future fusion reactors. In this paper, we investigate the coupling properties of two open-ended transmission lines radiating directly into the plasma: a ridged wave guide and a screened strip line. Using simplified expressions for the fields in the guide, the coupling on the fast magnetosonic wave is estimated assuming a slab geometry, a linear density profile and a single pass absorption of the wave. As the structures under consideration have a small poloidal extension, we have taken into account the poloidal spectrum as well as the toroidal one. The results are compared to those of a conventional loop antenna of same overall dimensions for the second harmonic H heating regime in a TORE SUPRA-like machine.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. II, PP. 1115-1120 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), PRI
Record Number: 1989124038400 / Last updated on: 1987-01-01
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