Abstract
Techniques for the mechanisms of the pre-ionization of a fast toroidal pinch system have been studied. Among the various techniques tested electron beam injection into the discharge tube is found to be the most satisfactory. A special electron gun capable of delivering 1A has been developed. Using this gun, break-down is possible at pressures as low as 2 mtorr in D2 gas. In addition to Townsend's alpha process, it is found that both electron drift due to the toroidal effect and turbulent diffusion caused by the drift dissipative ion-acoustic instability seem to play an important role during the build-up of the discharge in a high E/p, fast toroidal pinch experiment.
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