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Abstract

A theoretical investigation into the transport of fast ions from neutral beam injection in a tokamak with a bundle divertor is presented. The principal loss mechanism introduced by the bundle divertor is the cross-field drift of particles trapped between the toroidal magnetic field mirror and the divertor ripple maxima. This mechanism causes a significant proportion of the usual banana trapped region of velocity space to become a loss region. Analytic approximations for the velocity space loss region boundaries are derived. An analytic method is developed to estimate the resulting fast ion energy loss and the energy transfer to the background plasma ions and electrons. The fast ion energy loss during neutral injection into DITE with the Mk-II bundle divertor is predicted using this method to be no greater than 12% of the total injected energy. This compares favourably with the figure of 7% obtained by Monte-Carlo simulation.

Additional information

Authors: MUDFORD B S, CULHAM LABORATORY, ABINGDON, OXON. (UK);JOHNSON P C CULHAM LABORATORY, ABINGDON, OXON. (UK), CULHAM LABORATORY, ABINGDON, OXON. (UK)
Bibliographic Reference: AVAILABILITY: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON., OX14 3DB (ENGLAND), MENTIONING REPORT CLM-P 728, 1984
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