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During the ignited phase of a plasma such as ITER, absorption of LH waves by alpha particles may affect the current drive efficiency. To study the competition between electron and alpha absorption, a mechanism for the wave-alpha interaction is developed, on the basis of the quasi-linear (QL) theory. Once the alpha-production rate is established, the effect of the interaction on the alpha-distribution function, the absorption coefficient and the local density can be calculated. The model is based on the steady state Fokker-Planck equation supplemented by the QL diffusion term, derived for the alpha- distribution function. For proper boundary conditions, the local solution is used in a 1-D deposition code that takes into account the complete dispersion relation for LH waves, their propagation in a simplified (cylindrical) geometry, and the QL electron absorption along the toroidal magnetic field.

Additional information

Authors: BARBATO E, ENEA, Centro Ricerche Energia Frascati, Roma (IT);SANTINI F, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Report: RT/FUS/89/13 EN (1989) 32 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P.65-00044 Frascati, Roma (IT)
Record Number: 199011310 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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