THOMSON SCATTERING IN HIGH TEMPERATURE DEVICES
Thomson scattering provides the opportunity of measuring both the electron density and the electron temperature at selected points in the plasma. The typical cross-section for scattering of radiation by electrons is given by the Thomson cross-section delta-o 4 6.6x10**- 25- cm**2. Therefore for a plasma density n = 10**14 cm**-3 and a typical scattering dimension * = 1 cm, the scattered power is only a fraction of the order of 10**-12 of the input power. In order for the signal to be larger than the plasma bremsstrahlung, the source of radiation must be a high power Q-switched laser. We shall derive the spectrum of the scattered signal for a high temperature plasma. We shall look at the features of several of the scattering arrangement used in present day large tokamak experiments; to illustrate the potential of Thomson scattering as a diagnostic tool in high temperature devices.
Bibliographic Reference: COURSE ON DIAGNOSTICS FOR FUSION REACTOR CONDITIONS, VARENNA, COMO (ITALY), SEPT. 6-17, 1982 PP. 225-259, 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).
Record Number: 1989123012900 / Last updated on: 1987-01-01
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