Abstract
The radiation induced leakage current in dry air and SF 6 has been measured as a function of dose rate, voltage, and electrode separation in order to assess the problem for the ITER NBI system insulating gas. The results indicate that for the high voltages involved, the leakage current is a function of the gas volume rather than the electrode separation. This leads to very high leakage currents for the NBI system, with power losses greater than 1 MW being predicted. The present results represent an extrapolation from 25 kV to 1 MV, and further work is under way to increase the experimental voltage and perfect a theoretical model to enable more reliable predictions to be made.
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