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Abstract

There is experimental evidence that LH waves efficiently produce Fast Electron (FE) and Fast Ion (FI) tails when both linear wave propagation theory and quasilinear wave absorption theory disagree: they require that the launched k-spectrum be upshifted by a large factor. FE and FI tails are mutually exclusive phenomena occurring in adjacent density ranges separated by the critical density n-c, which does not necessarily coincide with the density for the onset of Parametric Decay Instabilities. The crucial problem is the k-spectrum upshift. We solve the upshift problem by showing that odd harmonics of the launched k-spectrum capable of strongly interacting with the plasma particles are created by the ponderomotive density modulation produced by a LH pump already tunnelled through the peripheral evanescence layer of the plasma. This resonant interaction, involving 4 waves with the same frequency, is a secular (in space) effect: a given k-harmonic is excited by the product of 3 harmonics of lower order - a term which has one k- number very close to the eigen k-number of the harmonic considered. Such an effect has not been noticed previously. This paper concentrates on the ponderomotive generation of k-harmonics of a LH wave permeating a cylindrical plasma.

Additional information

Authors: CANOBBIO E, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);CROCI R MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. I, PP. 583- 592 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 6
Record Number: 1989124028500 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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