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The operation of a photoconductive spark gap switch is reviewed. It is shown that it is possible to produce pulses far below the self-breakdown voltage of the gap. The resistance of the switch depends on the switched current through the switch. Electro-dynamic simulations show that the rise time of the pulse depends on the layout of the switch and is approximately 35 ps for the setup used here.
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Brussaard et al. (2007) studied this question.
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