Laser measurements of the radial profiles of the electron temperature and density in the FT-1 tokamak

The radial profiles and time evolution of the electron density and temperature in the FT-1 tokamak have been measured under conditions such that the average electron density in the discharge was 5 x 10/sup 12/ cm/sup -3/. A ruby laser with a pulse energy of 5 J was used. The observation solid angle was 1.5 x 10/sup -2/ sr. A pulsed multichannel spectrometer was used to detect the scattered-light spectrum. The radial profiles of the properties were recorded during ohmic heating of the plasma. A change in the profile of the electron temperature was detected when the rf pulse was applied to the plasma.