Test of a two-dimensionally focusing quasi-optical antenna using a gyrotron

Idehara, T.; Tatsukawa, T.; Brand, G. F.; Fekete, P. W.; Moore, K. J.
May 1989
Applied Physics Letters;5/1/1989, Vol. 54 Issue 18, p1740
Academic Journal
A quasi-optical antenna having one elliptical reflector and one parabolic reflector has been built for millimeter wave scattering measurements on the TORTUS tokamak plasma at the University of Sydney. This letter reports the first demonstration of the properties of such an antenna using a gyrotron millimeter wave source. Its advantages are (1) good two-dimensional focusing (along the major radius and the toroidal directions) and (2) easy movement of the focus across the diameter of the plasma by changing the orientation of the parabolic reflector.


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