Multiple Cell Array Detector for a Heavy Ion Beam Probe on the T-15MD Tokamak

The potential of utilizing a multiple cell array detector (MCAD) [8] has been demonstrated as an additional tool for correlation studies of density and poloidal field fluctuations in a plasma as a part of the heavy ion beam probe on the T-15MD tokamak. The optimum position and size of the MCAD have been found, and its cell size has been determined. Trajectories of probing particles have been calculated and the plasma region for measurements has been estimated for the toroidal magnetic fields B_T = 1.2, 1.5, 1.7, and 2.0 T. It has been shown that simultaneous measurements with the MCAD and the energy analyzer as the main measurement tool are possible, which allows the study of radial and poloidal spatial correlations of medium scale comparable to the small plasma radius. The spatial resolution of measurements and attenuation of the beam current signal during its passage through the plasma have been estimated.