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Abstract

A Monte-Carlo investigation of the high power fundamental minority (D)T ICRF heating in JET is undertaken. The effect of the minority ion concentration, the location of the resonance layer, the symmetry of the wave field spectrum, the background ion temperature and the alpha-particle absorption of the ICRF power on the fusion yield is assessed in a projected pellet injected reference discharge. Even with n(D)/n(e) approx. 30%, which is needed for a high fusion yield, the finite orbit width and its related transport effects, such as the banana drift and the RF-induced diffusion and drift, are important and strongly reduce the attainable yield. However, as the transferred power to background ions dominates over the power to electrons in this case, the increased target triton temperature can significantly improve the yield. The use of the asymmetric wave field spectrum improves the confinement of the resonating ions and is shown to enhance the yield and duration time of the peak yield value substantially. The effect, if additionally applied to tritons, could delay the characteristic deterioration of the peaked density profiles during the pellet-enhanced-performance (PEP) modes. Alpha- particle absorption of the RF power was found to be very small.

Additional information

Authors: KOVANEN M A, Lappeenranta University of Technology and National Research Council for Technology (FI)
Bibliographic Reference: Report: JET-P(91)24 EN (1991) 15 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199111627 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en