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Abstract

The expectations of neutral beam injection theory and confinement degradation are borne out by NBI on JET, with respect to both high density plasmas, in which the electron and ion temperatures are similar and the energy confinement is severely reduced and high temperature plasmas, in which the ion temperature exceeds the electron temperature and energy confinement is little affected when pumping the edge particle flux allows low densities to be maintained. The predictions of pellet injection on JET indicate that a push towards 10 kms**-1 appears to be warranted for JET, with somewhat improved penetration in the absence of fast ion effects and as a means of recovering penetration to the central plasma in the presence of fast ions. The potential disadvantages, including substantial radiation losses and the failure to recover ignition-like conditions after pellet injection (unless confinement improves) should be considered together with the potential benefits, including lower edge fluxes, peaked densities and high edge temperatures obtained with continuous pellet injection and pumping.

Additional information

Authors: WATKINS M L, JET JOINT UNDERTAKING, ABINGDON (UK);HOULBERG W A, JET JOINT UNDERTAKING, ABINGDON (UK);KUPSCHUS P, JET JOINT UNDERTAKING, ABINGDON (UK);STUBBERFIELD P M, JET JOINT UNDERTAKING, ABINGDON (UK);TARONI A JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: 13TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA HEATING, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 PP. 33-36 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
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