A four-channel polarizing interferometer for ECE measurements on FTU tokamak
Fourier transform spectrometers (FTS) are very useful for ECE measurements as they can be calibrated absolutely by standard blackbody sources, thus allowing independent electron temperature measurements to be obtained. The simultaneous use of several spectrometers is often required, either to analyse two dimensional configurations or to study the spatial distribution of suprathermal electrons. The path difference in conventional FTS is scanned by translating a plane mirror; an alternative scheme is based on the rotation of a screw-shaped reflector, which makes possible the development of multichannel instruments with a single, very fast scanning device. In this paper a new version of the FTS is described, in which the size of the screw-shaped reflector has been increased, both in order to increase the scope and to serve four interferometric channels.
Bibliographic Reference: Paper presented: 18th International Conference on Infrared and Millimeter Waves, Colchester (GB), September 6-10, 1993
Availability: Available from (1) as Paper EN 37691 ORA
Record Number: 199311314 / Last updated on: 1994-11-28
Original language: en
Available languages: en