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Ion cyclotron range of frequencies (ICRF) heating is an auxiliary heating system that can provide a significant fraction of bulk ion heating in a reactor tokamak. However, to maintain a high ion heating fraction during the burn phase, when the concentration of fusion products will be beyond 10%, the parasitic absorption of ICRF power by alpha particles has to be minimized. As several heating scenarios are envisaged for reactor operation in a D-T mixture, it is important to assess the efficiency of these scenarios in terms of bulk ion heating. One is therefore led to carefully study the interaction between the wave and the energetic particles. Within the quasi-linear approximation, the effect of ICRF heating on the resonating ion distribution function can be viewed as a diffusive process in phase space. The resulting diffusion coefficient is therefore intimately linked to the efficiency of the wave particle interaction. This paper compares two models for calculating the ICRF induced quasi-linear diffusion coefficient, and discusses the salient features for correctly assessing the efficiency of the wave particle interaction.

Additional information

Authors: BERGEAUD V ET AL, CEA, Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral report given at: 27th EPS Conference on Controlled Fusion and Plasma Physics, Budapest (HU), 12-16 June 2000. Published in: Europhysics Conference Abstracts, Vol.24B (2000), pp.1088-1091
Record Number: 200113834 / Last updated on: 2001-10-04
Original language: en
Available languages: en
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