THEORY OF EXCITATION OF ASYMMETRIC K-3S-SPECTRUM BY PHASING THE JET ICRF ANTENNAE
In this paper, we carry out a theoretical study of the excitation of travelling ICRF waves in JET, based on a 3D planar antennaplasma coupling model. The antennae are progressively phased to excite a desired integral number of parallel wavelengths around the torus (no = 1, 2, 3 ... etc) where no = 3 or 4 is appropriate for mode conversion current drive and a somewhat higher number for the minority current drive. Several sets of antenna combinations including that of a single pair along have been analyzed and the results indicate that a single pair of antenna system is unable to impose the desired no in the plasma. However, as the number of energized antennae is increased, the directivity increases reaching about 20% for 8 antennae and the imposed no is also found inside the plasma. We also present results of the field distribution in real space inside the plasma by Fourier inversion of the k3S spectrum radiated by the travelling wave antennae with a view to provide an input to the FokkerPlanck Codes, leading to the calculations of current drive efficiencies.
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-R(86)05, 1986
Record Number: 1989126008300 / Last updated on: 1988-02-01
Available languages: en