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Abstract

In microwave systems, increasing plasma densities and sizes lead to a shift of the probing radiation from the millimeter towards the submillimeter region of the spectrum. It is shown that the appropriate wavelength should lie between a lower limit resulting from the required precision of the measurement and an upper value set by the need for keeping refraction effects small. Appropriate submillimeter laser sources are reviewed and described. Advantages of phase modulation and corresponding schemes are presented. Gaussian beam formulae and their application to the design of interferometers are introduced. Free space propagation of far infrared beams is compared to wave guiding by oversized metallic or dielectric tubes. The compensating interferometer technique for reducing errors due to mechanical vibrations of the main interferometer support, and for extending the probing wavelength range is described. Choice of suitable material for the optical components and of the detectors are discussed. The data acquisition systems and results obtained with the present apparatus are briefly presented.

Additional information

Authors: VERON D CEA, CENTRE D'ETUDES NUCLEAIRES, FONTENAY-AUX-ROSES (FRANCE), CEA, CENTRE D'ETUDES NUCLEAIRES, FONTENAY-AUX-ROSES (FRANCE)
Bibliographic Reference: COURSE ON DIAGNOSTICS FOR FUSION REACTOR CONDITIONS, VARENNA, COMO (ITALY), SEPT. 6-17, 1982 PP. 199-223, 843 P., 1983, ISBN 0-08-031161-X WRITE TO PERGAMON PRESS LTD., HEADINGTON HILL HALL, OXFORD OX3 0BW (ENGLAND), PRICE: UKL 47 (EUR 8351 E).
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