A research activity involving the detailed consideration of novel high voltage transformers (HVTs) for pulsed-power applications has recently begun at Loughborough University (LU). Although the main goal is the demonstration of a compact and lightweight unit employing magnetic self insulation under vacuum conditions, the initial stage of the work is directed towards the development of a conventional air-cored HVT as a main component in a compact power supply for HPM sources. In cooperation with the Swedish Defence Research Agency (FOI), the power supply has been tested with a HPM source of the vircator type.

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A simple phenomenological model is described for L(t) calculating spark-gap resistance in nanosecond gas zo vo C VR(t) discharges. Initially an existing model is described, which 0 0 C R(t) involves the density and composition of the gas in which the spark-gap is immersed and the radius of the expanding channel. The model is then extended, using conductivity values fitted to experimental data. The accuracy of the Figure 1. Equivalent circuit [2, 3] of spark-gap and model is validated by comparison with existing transmission line. Z0 is line impedance, V0 charging measurements.voltage, C switch capacitance, VR(t) reflected voltage, L(t) time dependent spark-gap inductance and R(t) time dependent spark-gap resistance.

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