Troll: A 4-MV Peak Voltage Pulser

摘要

A 4 MV peak voltage pulser for the Troll accelerator has been designed, fabricated, and delivered to Sandia National Laboratories by Maxwell Laboratories, Inc. The pulser is required to produce a flat-top pulse, with a variable width, to drive a cold-cathode diode. The system operates over a range of 2 to 4 MV. A 46-stage Marx generator is used to directly drive the diode. The diode impedance is relatively high (400 to 4000 omega ) and causes overshoot of the output voltage due to the stray capacitance of the Marx generator. To reduce the overshoot, a unique snubber network was used to damp out the oscillations. The pulse width is controlled over a range of 250 ns to 2 mu s by a diverter switch. The switch is a hybrid two-stage spark gap, with the first gap in trigatron configuration and the second gap self-closed by overvoltage from the first gap. (ERA citation 12:043864)