Schematic representation of the high voltage pulser. The switch is normally open (N.O.). The current-limiting resistance is 2 MΩ and the total storage capacitance is 118 nF.
Circuit diagrams of the pulser (a) front end and (b) transmission line transformer and output end. A pair of fast diode assembly (FDA) units provide protection for the switch. Trigger is an applied +5 V pulse. The −HV TLT and 0V signals are output to the capillary electrodes along a pair of coaxial cable assemblies.
Photograph of plasma discharge in a sapphire capillary with gas backing pressure of 70 mbar. The left hand electrode is the cathode.
(a) Current pulse with main peak inset and (b) oscilloscope screen shot showing histogram of 100 shots with a current pulse r.m.s. jitter στ = 4.0 ns. DC charging voltage is 7 kV and backing pressure is 103 mbar.
Comparison between a magnetic transformer-based pulser (blue data) and the new solid-state pulser (black data) in terms of the (a) voltage across CDW at maximum charging voltage and (b) current pulse r.m.s. temporal jitter dependence on gas backing pressure.
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