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Abstract

ICRF-driven fusion reactivity has been determined in the JET tokamak using measurements of 16.6 MeV gamma-ray emission arising from d[(3)He,gamma] (5)Li reactions during central rf heating in the [(3)He]d minority regime. Up to 1MJ of fast minority ions in the plasma has been produced with the application of up to 15MW of rf power. The maximum rate produced by d[(3)He,p] (4)He fusion reactions has been estimated as 2 x 1.0 E16 /s (equivalent to 60kW of fusion power in charged particle products). The reactivity increased strongly with coupled rf heating power, with some evidence of a weakening of the dependence, leading to a saturation in Q at the highest coupled rf power levels. The experimentally measured anisotropic fast ion energies and fusion reaction rates have been simulated using a radially-dependent Stix model for a wide variety of discharges. Analysis of the radial profile of fusion reactivity shows that when the rf power density is maximised on the magnetic axis of the discharge, the fusion reactivity is peaked away from the axis. This effect is caused by the minority ions near the centre of the discharge being driven to energies beyond the maximum in the fusion cross-section.

Additional information

Authors: BOYD D A, University of Maryland (US);ERIKSSON L G, Chalmers University of Technology, Gothenberg (SE);CAMPBELL D J, JET Joint Undertaking, Abingdon, Oxon.(GB);CORDEY J G, JET Joint Undertaking, Abingdon, Oxon.(GB);CORE W, JET Joint Undertaking, Abingdon, Oxon.(GB);CHRISTIANSEN J P, JET Joint Undertaking, Abingdon, Oxon.(GB);COTTRELL G A, JET Joint Undertaking, Abingdon, Oxon.(GB);HELLSTEN T, JET Joint Undertaking, Abingdon, Oxon.(GB);JACQUINNOT J, JET Joint Undertaking, Abingdon, Oxon.(GB);JARVIS O N, JET Joint Undertaking, Abingdon, Oxon.(GB);KISSEL S, JET Joint Undertaking, Abingdon, Oxon.(GB);LOWRY C, JET Joint Undertaking, Abingdon, Oxon.(GB);NIELSEN P, JET Joint Undertaking, Abingdon, Oxon.(GB);SADLER G, JET Joint Undertaking, Abingdon, Oxon.(GB);START D F H, JET Joint Undertaking, Abingdon, Oxon.(GB);THOMAS P R, JET Joint Undertaking, Abingdon, Oxon.(GB);VAN BELLE P, JET Joint Undertaking, Abingdon, Oxon.(GB);WESSON J, JET Joint Undertaking, Abingdon, Oxon.(GB)
Bibliographic Reference: Report: JET-P(88)42 EN (1988)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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