Measurement of electron cyclotron emission in Tore Supra using Fabry-Pérot interferometers
The aim of this study was to develop techniques for the calibration of the interferometers which are used on the tokamak Tore Supra to measure cyclotron emission of electrons, from which the temperature of the electrons can be deduced. For emission measurement within the millimeter wave range there are two types of interferometer - the Michelson and the Fabry-Pérot. The source used for the calibration of the Michelson interferometer was an eccosorb plate at the temperature of liquid nitrogen. The calibration spectrum was obtained by collecting measurements over a period of 10 hours, in contrast to the Fabry-Pérot method which takes 30 hours, but allows an absolute calibration of interferometers based on measurements of electron temperature. The most direct method of calibration employs the technique of coherent addition, taking advantage of rapid sweeping by the Fabry-Pérot's mobile grid mounted on a stepped motor driven by a microprocessor. The results show that from a theoretical and practical viewpoint, this method has distinct advantages over the long-established techniques of coherent addition and synchronous detection.
Bibliographic Reference: Paper presented: 2ème Congrès de la Division de Plasma, Orsay (FR), Sept. 3-4, 1990
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Record Number: 199011501 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr