Experiments on the Adiabatic Toroidal Compressor

Magnetic compressional heating of a tokamak discharge has been demonstrated successfully in the Adiabatic Toroidal Compressor (ATC). In addition to these investigations of compressional heating, other basic measurements have been made on ATC recently. These measurements are of interest because the ATC incorporates an air-core transformer and dispenses with the usual copper shell, two features likely to be found on future larger devices with smaller aspect ratios. The following topics are discussed: (1) characteristics of the uncompressed discharges in ATC, including the dependence of $beta$/sub p/ on discharge parameters, bolometric measurements of the energy balance, measurements of the concentration of impurities; (2) MHD-behavior and attempts at stabilization of the m = 2 kink-tearing mode. (auth)