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Abstract:  t and the charging circuit. Principle of the pulse generator circuit Simplified description of circuit The pulse current circuit consists basically of three elements: a capacitor, a switch and an inductive load. Figure 1 When the capacitor is charged and the switch is closed a sinusoidal current flows. An approximate calculation gives the following results for the capacitor charging voltage and capacitance. The energy stored in the capacitor is equal to the energy in the magnetic field of the circuit inductance. R 2 2 1 2 i L v C = The frequency of oscillation is determined by the following equation: With L given as 420nH, the peak current i as 400kA and the period of the oscillation as 20s the resulting capacitor charging voltage is 52.8kV and the capacitance is 24.1F. In this calculation, however, some important quantities have been neglected: . There is some resistance in the circuit. This will dampen the oscillation. . The circuit inductance is not concentrated in one comp