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Compact scanning retarding potential analyzer.

Dan M Goebel1, Giulia Becatti1

  • 1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA.

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This summary is machine-generated.

A new miniature scanning electrostatic energy analyzer measures ion energy in low-pressure plasma. Its compact design and simple assembly enable detailed plasma discharge analysis.

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Area of Science:

  • Plasma Physics
  • Analytical Instrumentation

Background:

  • Characterizing ion energy distribution is crucial for understanding low-pressure plasma discharges.
  • Existing methods often face limitations in size, complexity, or applicability in challenging environments.

Purpose of the Study:

  • To develop a compact and robust electrostatic energy analyzer for in-situ ion energy distribution measurements.
  • To demonstrate the analyzer's capability in challenging plasma environments.

Main Methods:

  • Designed a miniature scanning electrostatic energy analyzer (5-mm diameter, 2.5-mm thickness) with a four-grid retarding potential analyzer configuration.
  • Utilized a simple mounting technique with high-temperature ceramic cement for grid isolation.
  • Employed a fast-scanning two-axis probe drive to prevent overheating and enable insertion into difficult locations.

Main Results:

  • Successfully developed a compact electrostatic energy analyzer suitable for low-pressure plasma discharges.
  • Demonstrated effective rejection of electron flux and discrimination of ion energy.
  • Validated performance through measurements in a hollow cathode plume in xenon plasmas, providing ion energy profiles.

Conclusions:

  • The developed miniature scanning electrostatic energy analyzer offers a practical solution for ion energy measurements in confined and demanding plasma environments.
  • The simple design and robust construction facilitate its use without complex fabrication or alignment.
  • Guidelines for designing analyzers for high-density plasma operation are discussed, enhancing future research possibilities.