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Refractive and relativistic effects on ITER low field side reflectometer design
G Wang1, T L Rhodes, W A Peebles
1University of California, Los Angeles, California 90095, USA. wangg@fusion.gat.com
Abstract:
The ITER low field side reflectometer faces some unique design challenges, among which are included the effect of relativistic electron temperatures and refraction of probing waves. This paper utilizes GENRAY, a 3D ray tracing code, to investigate these effects. Using a simulated ITER operating scenario, characteristics of the reflected millimeter waves after return to the launch plane are quantified as a function of a range of design parameters, including antenna height, antenna diameter, and antenna radial position. Results for edge/SOL measurement with both O- and X-mode polarizations using proposed antennas are reported.
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