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Abstract

Ion cyclotron heating by magneto-acoustic waves being launched from the low field side is characterized by coupling via eigenmodes. When the absorption coefficient, which determines the width and amplitude of the resonances, exceeds a critical value (typical 0.25 for JET) the antenna will couple to a large number of eigenmodes. The average value of the coupling resistance does not depend on the absorption. Antennae which couple to small k-z, will have a narrower radiation spectrum than if single pass absorption is assumed and the spectrum will be characterized by a compound resonance in the interval (O,K$*-z) whose position is very sensitive to small variations in the equilibrium. This will have consequences on current drive where a prescribed wave spectrum is important for the efficiency. Further, it may affect the partition of power absorbed by electrons and ions.

Additional information

Authors: HELLSTEN T, JET JOINT UNDERTAKING, ABINGDON (UK);APPERT K 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. 37-40 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
Record Number: 1989125008300 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en