Study of the Beam Divergence in Diamond Field Emitter Array Cathodes

At a Glance

Metadata	Details
Publication Date	2018-08-01
Authors	Dong-Sung Kim, Heather Andrews, Ryan Fleming, John Lewellen, Kimberley Nichols
Institutions	Los Alamos National Laboratory
Citations	5

Abstract

We present the results of beam divergence studies for the diamond field emitter array (DFEA) cathodes producing high-current-density electron beams. At Los Alamos National Laboratory (LANL), we fabricate and test the micrometer-scale diamond pyramids with nanometer-scale sharp tips for use as an electron beam source for a compact dielectric laser accelerator. For the beam divergence measurements, we assembled a test stand consisting of a DFEA cathode, a small mesh aperture anode, and a screen representing of a sapphire disk coated with ZnO (AZO) for beam visualization. A negative voltage of about 40 keV is applied to the cathode, and the mesh and the screen are kept at ground. We record the spot size corresponding to the size of the electron beam on the AZO screen past the mesh anode at different mesh to screen distances. We also conduct the beam dynamics simulations with General particle Tracer (GPT). In this paper, we present the results of the experimental measurements and GPT simulations, along with calculations of the beam’s divergence.

Tech Support

Original Source

DOI: https://doi.org/10.1109/aac.2018.8659424

References

2018 - An investigation of electron beam divergence from a single DFEA emitter tip
2018 - Study of the beam divergence in diamond field emitter array cathodes
2018 - Emission models and beam dynamics for diamond emitters in a compact source of high brightness beams
2017 - Modeling of diamond field-emitter arrays for high-brightness photocathode applications
2018 - A simple variable focus lens for field-emitter cathodes