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Emittance Studies of Novel Cathodes

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Technical Report,01 May 2015,30 Apr 2018

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University of Wisconsin-Madison Madison United States

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This project began as an investigation into novel carbon fiber cathodes and their emittance, with a mind toward providing experimentaldata to compare to recent theoretical developments. In the course of the project, we quickly realized that an entirely new type ofelectron microscope was required to pursue this research, which we have developed and dubbed the FFEEM, or Focused FieldElectron Emission Microscope. This microscope is the field emission analog of photoemission and thermal emission electronmicroscopes already present in the literature, but with several crucial differences. In this project, we began by investigating thechallenges inherent to designing an emission electron microscope around a field emission source. We proceeded to design a FFEEMusing field emission models from the literature and an electron optics software. Finally, we have constructed the FFEEM in anultra-high vacuum chamber, obtained an initial focused image of an etched tungsten fiber field emission cathode, and reproduced theexperimental image in simulation.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Electrooptical and Optoelectronic Devices

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