Energy balance of the TW pulsed power generator Kalif-Helia

KALIF-HELIA is a TW pulsed power generator based on the high energy linear induction adder principle. For the nominal 95 kV charge voltage of the Marx generator an electrical pulse was expected with a fwhm of 50 ns, a peak voltage and -current of about 5.5 MV and 400 kA respectively. Depending on the switch-out voltage of the PFL water switches a total energy from 123 to 128 kJ at a 15 /spl Omega/ load should be available. For negative polarity operation and for all parameters investigated during an optimization campaign the measured beam energy never exceeded 70 kJ. In this paper the measurements performed are described, optimization results are summarized, possible reasons for the low energy output is discussed and finally, countermeasures are suggested.