OBSERVATION OF LOWER HYBRID WAVES BY COHERENT SCATTERING OF MICROWAVES IN WEGA
The scattering of 2 mm radiation by the density fluctuation associated with the L.H. waves is used to localize the injected waves within a cross section of the plasma. A translating antenna set-up scans a region extending from the center of the plasma to the boundary with two fixed scattering angles (40**o and 70**o), each one corresponding to a given perpendicular refractive index (N = 116 and 195 respectively). The measured amplitudes allows one to determine the local value of certain spectral components of N in the plasma, if density and temperature profiles are known. The results obtained are interpreted using a ray tracing technique. The existance of drift waves modulated by the R.F. power is also observed under certain conditions.
Bibliographic Reference: WRITE TO CEA MENTIONING REPORT EUR-CEA-FC 1193 EN, 1983
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Record Number: 1989122018200 / Last updated on: 1987-01-01
Available languages: en