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Abstract

In thermonuclear plasmas of the next Tokamak generation, the dynamics of fusion products needs to be understood as it could well influence reactor performances. In such a low collisionnality regime, a careful analysis of the associated transport and relaxation processes is required. For this program to be completed, the effect of a perturbing field on fast particle individual motion must be precisely evaluated. This imposes a requirement to address the question within Hamiltonian mechanics. In this framework, resonances of particle trajectories with low frequency fields arise naturally as a potential mechanism for transport and relaxations. The latter processes result from the destruction of adiabatic invariants when a stochasticity threshold is reached. Then, the quasi-linear theory is applicable, and diffusion coefficients can be derived. In this paper, the method is briefly reviewed and two reactor relevant situations analysed: heating of energetic ions under the effect of a compressionnal wave, and alpha-particle losses induced by the toroidal field ripple.

Additional information

Authors: BECOULET A, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);GAMBIER D J, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);GRUA P, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);RAX J M, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);ROUBIN J P, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34460 ORA
Record Number: 198910805 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en