COMMENTS ON THE ALFVEN WAVE SPECTRUM AS MEASURED ON THE TCA TOKAMAK
The heating in the TCA tokamak can be ascribed to a combination of compressional Alfven wave heating (CAW) and discrete Alfven wave (DAW) heating. In this communication an alternative plasma heating mechanism by the direct excitation of torsional Alfven waves (TAW) is invoked to account for the observed features of the TCA experiment. TAW is inadvertently excited by an azimuthal antenna used for CAW heating if there is no provision for Faraday shielding as in the case of TCA. A number of observations and deductions are made in support of the case for TAW heating; especially noted as evidence for the presence of TAW heating in the TCA is the disappearance of heating effects upon the introduction of the Faraday screen. CAW heating, on the contrary, would not have been adversely affected by the presence of the Faraday screen as evidenced by the large number of ion - cyclotron heating experiments employing Faraday screen in conjunction with compressional Alfven wave heating. In all, the author is led to believe that there is overwhelming evidence of TAW heating in the TCA and that the observed results are more in accord with TAW than CAW heating.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP 4/227, 1986
Record Number: 1989125010700 / Last updated on: 1987-01-01
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