SPECTROSCOPIC IMAGING-SYSTEM FOR QUANTITATIVE-ANALYSIS OF THE DIVERTOR PLASMA OF THE TOKAMAK DE VARENNES

A turoidally viewing spectroscopic imaging system has been developed f or the Tokamak de Varennes providing measurements of the poloidal dist ribution of the absolute radiated power of deuterium and impurity spec ies in the upper divertor region. Real time digitization is achieved u sing a low cost PC based digital imaging system. This system is used t o obtain measurements of the divertor strike point as well as the shap e of the Aux surfaces in the divertor. The diagnostic's excellent spat ial resolution and toroidal view provides an opportunity to quantitati vely compare the measured two dimensional (2D) radiated power distribu tion to that calculated from 2D Monte Carlo transport codes. These 2D images provide unique and valuable information on the physics of local plasma interactions with divertor components and particle transport i n a closed divertor. Additionally, by using two cameras simultaneously , the line ratio technique can be applied to the images to estimate pl asma parameters in the divertor. (C) 1997 American Institute of Physic s.