A broadband quasi-optical collection system for the JET heterodyne radiometer

L. Porte

doi:10.1117/12.2298561

30 August 1993 A broadband quasi-optical collection system for the JET heterodyne radiometer

L. Porte

Proceedings Volume 2104, 18th International Conference on Infrared and Millimeter Waves; 21043L (1993) https://doi.org/10.1117/12.2298561
Event: 18th International Conference on Infrared and Millimeter Waves, 1993, Colchester, United Kingdom

Abstract

A multi-channel, fixed frequency heterodyne radiometer, operating inthe radiation frequency range73GHz to 127GHz, is used for electroncyclotron emission measurements on the JET tokamak (1). In atokamak,the spatial variation of the magnetic field in the plasma provides the means by whichspatially resolved measurements of theeission can be made (2). To obtain well localised measurements, itisnecessary to minimise the volume over which the measured emission is averaged. The spatialresolution along the line of sight is determined by the spectral resolution of the radiometer which, in thecase of the JET radiometer, is 500 MHz. This corresponds to a spatial resolution of =20.mm. The spatialresolution transverse to the line of sight is determined by the antenna pattern of the collection system. Atpresent a waveguide system is used and this has a spot size of -20 mm at the plasma centre. A quasi- optical system which will be used to improve this is under construction and is described in this paper.

Citation Download Citation

L. Porte "A broadband quasi-optical collection system for the JET heterodyne radiometer", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21043L (30 August 1993); https://doi.org/10.1117/12.2298561

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