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Variable beam entrance Faraday cup system for pulsed electron beam current profile characterization.

Weijie Huo1, Jing Hu1, Ling Qin1

  • 1State Key Laboratory of Mechanical System and Vibration, Mechanical Engineering Department, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.

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A new variable beam entrance Faraday cup system accurately measures electron beam profiles from transient hollow cathode discharge. Higher voltage increases electron beam current and density, aiding metallic material processing.

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Area of Science:

  • Plasma physics and beam diagnostics.
  • Materials science and surface engineering.

Background:

  • Pulsed electron beams from transient hollow cathode discharge (THCD) offer high energy flux for material processing.
  • Accurate measurement of electron beam characteristics is crucial for optimizing material processing applications.

Purpose of the Study:

  • To design and validate a high-accuracy variable beam entrance Faraday cup (VBEFC) system.
  • To measure the radial profile and temporal evolution of THCD-generated electron beams.
  • To investigate the effect of accelerating voltage on electron beam properties.

Main Methods:

  • Development of a VBEFC system with optimized beam entrance, electron collector, grounding, and shielding.
  • Experimental measurement of electron beam current and current density distributions.
  • Varying radial locations, time, and accelerating voltages during measurements.

Main Results:

  • The VBEFC system successfully determined the radial profile and temporal evolution of the THCD electron beam.
  • Electron beam current and current density increased with accelerating voltage at all measured radii.
  • Observed increase in beam current and density correlates with voltage-promoted self-focused propagation.

Conclusions:

  • The VBEFC system provides accurate measurements for THCD electron beams.
  • Accelerating voltage is a key parameter influencing electron beam intensity and focusing.
  • This technology can advance high-energy flux electron beam applications in metallic material processing.