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A battery-powered over-voltage triggering method for two-electrode spark gaps in Marx generator.

Xuedi Liu1, Huibo Zhang1, Zicheng Zhang1

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This study presents an over-voltage triggering method for two-electrode spark switches, eliminating trigger electrode ablation. This innovation extends the lifespan of Marx generators, enabling maintenance-free repetitive operation.

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Area of Science:

  • Electrical Engineering
  • Pulsed Power Systems
  • High Voltage Engineering

Background:

  • Repetitive Marx generators commonly use triggered gas switches with trigger electrodes for high current capability.
  • Trigger electrode ablation limits the operational lifespan and necessitates maintenance in these systems.

Purpose of the Study:

  • To introduce a novel over-voltage triggering method for two-electrode spark switches.
  • To enhance the reliability and reduce maintenance requirements of repetitive Marx generators.

Main Methods:

  • Replacing a charging inductor in a Marx generator with a pulse generator for over-voltage triggering.
  • Utilizing a single stackable module powered by a 12 V lithium battery pack.
  • Generating a high-voltage trigger pulse with specific amplitude and rise time.

Main Results:

  • Achieved a high-voltage trigger pulse of 60 kV with a rising speed of 7.65 kV/100 ns.
  • Demonstrated the feasibility of the over-voltage triggering method using a compact power source.
  • Confirmed the absence of trigger electrodes in the two-electrode spark switch design.

Conclusions:

  • The developed over-voltage triggering method effectively eliminates trigger electrode ablation.
  • This approach significantly extends the operational lifetime of spark switches.
  • Enables the realization of maintenance-free, repetitive operating Marx generators.