RAY FOCUSING OF LOWER HYBRID WAVES IN CURRENT DRIVE AND ELECTRON HEATING CONDITIONS
Ray trajectories of lower hybrid waves in toroidal low-density plasma show the occurrence of focusing of each component of the launched n-" spectrum. This effe takes place close to the plasma center at different toroidal angles, and gives rise to a caustic surface. Here, the strong wave field enhancement can give rise to nonlinear broadening of the original n-" spectrum. High n-" values, in turn, are just what justifies the wave - electron interaction observed in current drive and electron heating experiments as well as the fast ion tail observed at low density. In this paper a numerical analysis describes how the focusing effect occurs. Also a full wave equation is solved to evaluate the real wave field close to the caustics.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. II, PP. 1353-1360 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: 1989124041700 / Last updated on: 1987-01-01
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