LOWER HYBRID EXPERIMENTS IN ASDEX
Lower Hybrid experiments in the ASDEX divertor Tokamak began in November last year. 1.3 GHz rf power up to 800 kW with pulse durations up to one second were coupled with low reflection through an eight waveguide grill antenna. The grill waveguide inside surfaces were coated with a thin layer of coarse grained gold to suppress multipactor discharges. Experimental results (though still of a preliminary nature) have shown several interesting regimes of operation. At low plasma densities current drive is found. At higher densities the presence of energetic ions is detected by perpendicular charge exchange. These ions are generated at the plasma periphery and, apparently, are lost too fast to produce any significant body heating. VHF activity characteristic of parametric decay instabilities is observed above a certain density threshold.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. I, PP. 501 - 512 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), PRIC
Record Number: 1989124034900 / Last updated on: 1987-01-01
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