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In reactor design, the main constraint due to the effects of alpha particles is the thermal load produced by fast alpha losses, particularly at the first wall. Four basic loss mechanisms (orbit and neo-classical losses in the axisymmetric field, ripple-induced losses and those induced by large scale MHD perturbations) are analysed. The free energy of the high energy alpha population in thermonuclear plasmas may either create or modify plasma instabilities; this is seen in the thresholds and the growth rates of the instabilities. Theoretical analysis of this effect concentrates on the kinetic and internal kink instabilities. Possible pre-dt alpha particle simulation experiments are reviewed. NBI ripple losses in Tore-Supra, fusion product burn-up in JET and TFTR and time dependent nuclear measurements in JET are outlined. Finally plans for dt alpha particle diagnostics and experiments in JET and TFTR are presented. These depend substantially on the alpha power which can be produced, the full range of heating, confinement, ash accumulation and the approach to ignition requiring SMW or more.

Additional information

Authors: THOMAS P R, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(89)39 EN (1989)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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