The soft X-ray signal from the Adiabatic Toroidal Compressor (ATC) sometimes exhibits a 10% modulation with a frequency between 1 and 2 kilohertz. The radial profile of the soft X-ray signal and the electron temperature determined by laser scattering indicate that these fluctuations are associated with a limitation of the central electron temperature and a broadening of the temperature profile. By observing changes in the radial dependence of the relaxation oscillation during neutral counter injection, an increase of thirty to fifty percent in the radius where q = 1 has been measured.