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Rail-gap switch with a multistep high-voltage triggering system.

Po-Yu Chang1, Chih-Jui Hsieh1, Mei-Feng Huang1

  • 1Institute of Space and Plasma Sciences, National Cheng Kung University, Tainan City 70101, Taiwan.

The Review of Scientific Instruments
|December 2, 2020
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Summary
This summary is machine-generated.

A novel rail-gap switch with a multistep triggering system was developed for pulsed-power applications. This system ensures robust triggering and low inductance, making it suitable for high-current systems.

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Area of Science:

  • Electrical Engineering
  • Pulsed Power Systems
  • High-Voltage Switching

Background:

  • Pulsed power systems require reliable and fast high-voltage switches.
  • Traditional switches often face limitations in triggering speed and jitter.
  • Developing advanced switching technologies is crucial for enhancing pulsed power system performance.

Purpose of the Study:

  • To develop and characterize a rail-gap switch with a multistep triggering system.
  • To achieve precise and rapid triggering for multichannel discharges.
  • To evaluate the switch's performance in terms of delay, jitter, and inductance.

Main Methods:

  • Construction of a rail-gap switch with precise electrode alignment using a specialized jig.
  • Implementation of a multistep triggering system involving optical, slow HV, and fast HV pulse generators.
  • Testing the switch using a capacitor bank (0.5 μF, 20 kV) and analyzing discharge characteristics.

Main Results:

  • The multistep triggering system generated a negative high-voltage pulse (< -40 kV) with a fast fall time (-6.6 ± 0.4 kV/ns).
  • The rail-gap switch demonstrated robust triggering with a 180 ns delay and a low jitter of 20 ns (∼2% uncertainty).
  • The switch exhibited a low inductance of approximately 80 nH.

Conclusions:

  • The developed rail-gap switch and its multistep triggering system are suitable for pulsed power applications requiring current rise times around 1 μs.
  • The precise triggering and low inductance offer significant advantages for high-performance pulsed power systems.
  • This technology advances the capability of high-voltage switching in demanding applications.