This report presents design and construction of an impulse generator rated 1000 kV 30 kJ. The generator was constructed in accordance with Marx's circuit of 12 stages, which had the total capacitance of 50 nF. The load capacitance of 1000 pF was selected to determine the wavefront and wavetail resistors, which are made of Ni-Fe-Cr wire and wounded on PVC tubes with low inductance. The spark gaps are made of copper sphere with 15 cm in diameter. The performance of the generator was carried out. The test results showed that the generator cam generate impulse waveform at rated voltage with load capacitance up to 2000 pF and efficiency of 83%.
