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A Hamiltonian guiding centre particle following code has been developed to study the fast particle motion in the presence of arbitrary time-dependent electromagnetic perturbations. In conjunction with magnetohydrodynamics a (MHD) stability code, this code was used to analyse Toroidal Alfvén Eigenmode (TAE) and Kinetic 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 the stochastic diffusion coefficients are obtained. Generalisation of the method towards the self-consistent wave-particle evolution is described.

Additional information

Authors: BORBA D ET AL, JET Joint Undertaking, Abingdon, Oxon. (GB);APPEL L C ET AL, UKAEA/Euratom Fusion Association, Abingdon, Oxon. (GB);BERK H L ET AL, University of Texas at Austin, IFS (US);PINCHES S D, University of Nottingham (GB);SHARAPOV S E, RRC Kurchatov Institute, Moscow (SU)
Bibliographic Reference: Report: JET-P(95)26 (1995) 18pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199610333 / Last updated on: 1996-03-29
Original language: en
Available languages: en