ELECTRON-TEMPERATURE ESTIMATION IN THE SAHA-INSTITUTE-OF-NUCLEAR-PHYSICS TOKAMAK FROM THE SOFT-X-RAY IMAGING-SYSTEM

A soft x-ray imaging diagnostics has been developed for the study of m agnetohydrodynamic a activities in the Saha Institute of Nuclear Physi cs tokamak plasma and also to estimate the plasma electron temperature . The main feature of this diagnostics is the use of p-i-n photodiodes , and in this article we present the results of the estimated plasma e lectron temperature T-e(eV) by the absorber foil method. These values agree very closely with the estimated values from Spitzer resistivity. We feel that this technique of using a soft x-ray array for temperatu re measurement has a good potential for providing very economical T-e( r,t) measurements with good time and spatial resolution especially for low budget small tokamaks. (C) 1998 American Institute of Physics.[S0 034-6748(98)00803-X].