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At the last IAEA Technical Committee Meeting at Gut Ising in October 1988, JET reported on the generation of confinement improved PEP (Pellet Enhanced Plasmas) modes by early injection of 4 mm deuterium pellets and subsequent central heating with about 8-10 MW of ion cyclotron radio frequency heating (ICRH) or combined ICRH/neutral beam injection (NBI) heating in otherwise L-mode type 3 MA discharges. Since then, JET has expanded these pulses to higher plasma currents, higher additional heating power levels, employment of larger pellet size and, particularly, has combined the PEP modes with H-mode plasmas, to obtain transient plasma performances approaching those of the best competing scenarios. This report presents recent experiments and findings with respect to the injection of both 4 mm and 6 mm pellets.

Additional information

Authors: KUPSCHUS P H ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);HENDER T, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);BAYLOR L, Oak Ridge National Laboratory (US);SCHMIDT G L, Princeton Plasma Physics Laboratory (US)
Bibliographic Reference: Report: JET-P(93)39 EN (1993) 6 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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