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A Hamiltonian particle following code has been developed to study the fast particle motion in the presence of arbitrary time-dependent electromagnetic perturbations. In conjunction with an MHD stability code, this code was used to analyse TAE/KTAE-induced alpha-orbit diffusion and alpha-losses in JET plasmas. Resonant alpha-orbits are studied below and above the stochasticity thresholds, in the presence of single or several TAE and KTAE modes. Monte Carlo randomised ensembles of alpha-particles in the presence of finite-amplitude TAE/KTAE modes are followed, and estimates for stochastic diffusion coefficients are obtained. Generalisation of the method towards the self-consistent wave-particle evolution is described.

Additional information

Authors: APPEL L C ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: FUS 311 EN (1995) 14 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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