MEASUREMENTS OF THE ALFVEN WAVE SPECTRUM IN TCA
The modular and periodic antenna structure in TCA is shown to produce an extremely pure spectrum of excited waves. This purity, together with precise measurements of the antenna loading in different parts of the spectrum, has allowed us to demonstrate that it is essential to include both toroidal coupling and the Hall effect (w/w-ci not equal 0) in order to explain our results. We s ow that toroidicity produces coupling from the directly excited m=1 wave to m=0,2 waves. Discrete Alfven Waves are also seen for m=0,2 in addition to the directly driven m=1. The importance of the Hall effect is most visible when a travelling wave is excited, in which case the antenna loading depends on the direction of the wave imposed. We present the antenna loading found with different excitation structures and discuss the implications on the design of AWH antenna systems.
Bibliographic Reference: SIXTH TOPICAL CONFERENCE ON RADIOFREQUENCY PLASMA HEATING, CALLAWAY GARDENS, PINE MOUNTAIN, GEORGIA & AUBURN UNIVERSITY, ALABAMA (USA), MAY 13-15, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32136 ORA
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Record Number: 1989123084900 / Last updated on: 1987-01-01
Available languages: en