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A large-dynamic-range current probe for microsecond pulsed vacuum breakdown research.

Liang Zhao1, Jian-cang Su1, Xi-bo Zhang1

  • 1Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024, China.

The Review of Scientific Instruments
|February 2, 2015
PubMed
Summary
This summary is machine-generated.

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A novel large-dynamic-range current probe was developed for microsecond pulsed vacuum breakdown research. This probe accurately measures vacuum breakdown currents across a wide amplitude and duration range.

Area of Science:

  • Electrical Engineering
  • Plasma Physics
  • Materials Science

Background:

  • Accurate measurement of transient currents is crucial for understanding pulsed power phenomena.
  • Existing current probes may lack the dynamic range or bandwidth required for microsecond pulsed vacuum breakdown.
  • Vacuum breakdown research necessitates reliable diagnostic tools for characterizing electrical discharge behavior.

Purpose of the Study:

  • To design and fabricate a large-dynamic-range current probe suitable for microsecond pulsed vacuum breakdown research.
  • To characterize the performance of the developed current probe in terms of amplitude and duration response.
  • To investigate the characteristics of vacuum breakdown currents using the fabricated probe.

Main Methods:

  • The current probe utilizes a fixed impedance load to convert current signals to voltage signals.

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  • A two-stage resistor-capacitor voltage divider with adjustable ratio is employed for voltage signal testing.
  • A 40-Ω coaxial line connects the probe to the experimental chamber for testing 3-cm parallel-plate electrodes.

    • Main Results:

    • The fabricated current probe demonstrates a large dynamic range, responding to current signals from 10⁻² A to 10³ A.
    • The probe accurately measures current pulses with durations ranging from 10⁻² μs to 10¹ μs.
    • Characteristics of vacuum breakdown current under 30-μs quasi-sinusoidal pulses were successfully summarized.

    Conclusions:

    • The developed current probe is effective for measuring microsecond pulsed vacuum breakdown currents.
    • The probe's wide dynamic range and accurate response enable detailed analysis of vacuum discharge phenomena.
    • Further research can utilize this probe to explore the underlying mechanisms of different vacuum breakdown current types.