THE CRITICAL DENSITY IN LOWER HYBRID CURRENT DRIVE EXPERIMENTS INTERPRETED AS DUE TO THE SWITCH-OVER TO DOMINANT WAVE - ION INTERACTION
The onset of ion heating + or more generally of high energy tails in the perpendicular ion velocity distribution function + in the LH Heating experiments, has been shown to occur at the density at which the ratio Z of the normalized perpendicular phase velocity of the LH-wave to the normalized parallel phase-velocity becomes of the order of unity ("switch-over" density). This density marks the limit between the regimes of dominant power absorption from the waves either by the electrons or by the ions. The switch-over density, as follows from the dispersion relation, is practically independent of the wave N-" spectrum, and increases roughly as the square of the frequency. The critical density observed in current drive experiments is shown to coincide with the switch-over density.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. I, PP. 593 - 600 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), USD
Record Number: 1989124040300 / Last updated on: 1987-01-01
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