-
Author(s):
L.N. Vyachenslavov, K. Tanaka, K. Kawahata
-
Title:
CO2 Laser Diagnostics for Measurements of the Plasma Density Profile and Plasma Density Fluctuations on LHD
Date of publication:
Apr. 2001
-
Key words:
two-colour interferometer, plasma flucttuations, imaging techniques, diffraction, dispersion, Thomson scattering
-
Abstract:
A Co_2 laser based diagnostics complimentary to the existing FIR interferometer is proposed. It combines interferometry for plasma density profile measurement under conditions of large density gradients, and both imaging and scattering techniques for observation of plasma fluctuations. Two-colour interferometer with a slab-like probe beam and a single multichannel linear detector array provide observation of plasma density profile and density fluctuations at two locations along the probe beam. Basic characteristics of the diagnostics are considered as well as some effects that include dispersion and are critical for two colour imaging technique. The results of the bench-top experiments with the prototype of the interferometer are presented.
-
|
