THEORY OF EXCITATION OF AN ASYMMETRIC K SPECTRUM BY PHASING THE JET ICRF ANTENNAE
Eight travelling wave antennae are successful in imposing a desired toroidal mode number whereas a single pair of antennae system does not impose the desired n-o in the plasma. The asymmetry of the excited spectrum gauged by the directivity is found to be about 20%. Due to a finite number of antennae energized, it is found that the excited spectrum contributes significantly to other modes too. In current drive calculations and estimation of efficiency, this spectrum should be appropriately taken into account. These other modes may still be beneficial as they may heat the plasma instead. Moreover, the modes adjacent to the imposed one will also produce suprathermal electrons beneficial to current drive. In JET, for n-o = 4 at 33 MHz, the energy of the resonant electrons will be about 70 keV.
Bibliographic Reference: 13TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA HEATING, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 PP. 81-84 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
Record Number: 1989125009800 / Last updated on: 1987-01-01
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