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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Published on: August 1, 2017

High power microwave switching utilizing a waveguide spark gap.

J Foster1, G Edmiston, M Thomas

  • 1Center for Pulsed Power and Power Electronics, Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, USA.

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

Researchers reduced the rise time of high power microwave (HPM) pulses from 600 ns to 50 ns using an overvoltaged spark gap in a waveguide. This faster switching enables better comparison between microwave breakdown experiments and theory.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Applied Electromagnetics

Background:

  • High power microwave (HPM) pulse generation and control are critical for various applications.
  • Existing switching technologies have limitations in speed and power handling.
  • Accurate comparison between theoretical models and experimental results in microwave breakdown requires precise pulse shaping.

Purpose of the Study:

  • To reduce the rise time of HPM pulses using a novel waveguide spark gap.
  • To enable faster switching of multimegawatt power levels.
  • To achieve a "squarelike" HPM pulse for improved experimental validation of theoretical models.

Main Methods:

  • Implementation of an overvoltaged spark gap within a waveguide structure.
  • Orientation of the spark gap to short the dominant TE(10) mode's electric field.
  • Experimental setup utilizing the waveguide spark gap and a high power circulator.
  • Comparison of experimental data with computer modeling.

Main Results:

  • Achieved a significant reduction in HPM pulse rise time from 600 ns to 50 ns.
  • Demonstrated the transition of the waveguide structure from transmissive to highly reflective in tens of nanoseconds.
  • Obtained a more desirable "squarelike" excitation profile for HPM pulses.

Conclusions:

  • The overvoltaged waveguide spark gap effectively reduces HPM pulse rise times.
  • This technique offers a faster alternative to mechanical switches for high power applications.
  • The generated "squarelike" pulses are crucial for advancing the understanding of microwave-induced dielectric window flashover.