Divergence study and emittance measurements for the electron beam emitted from a diamond pyramid

Divergence study and emittance measurements for the electron beam emitted from a diamond pyramid

https://www.sciencedirect.com/science/article/pii/S016890021931407X?via%3Dihub

Outline

Abstract

Keywords

1. Introduction

2. Detailed experimental setup for beam divergence

3. Experimental measurements of beam divergence

4. Simulations of the beam divergence and comparison to the experiment

5. Estimates of beam emittance from spot-size measurements

6. Conclusions

Declaration of Competing Interest

Acknowledgments

References

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 953, 11 February 2020, 163055

Divergence study and emittance measurements for the electron beam emitted from a diamond pyramid

Author links open overlay panelD.KimaH.L.AndrewsaB.K.ChoibR.L.FlemingaC.-K.HuangaT.J.T.KwanaJ.W.LewellenaK.NicholsaV.PavlenkoaE.I.SimakovaShow more

https://doi.org/10.1016/j.nima.2019.163055Get rights and content

Abstract

This paper reports the results of a divergence study and emittance measurements for an electron beam emitted from a single diamond pyramid in a sparse diamond field-emitter array (DFEA) cathode. DFEA cathodes are arrays of micrometer scale diamond pyramids with nanometer scale tips. A single diamond pyramid produces currents as high as 10 μA from a small surface area. DFEA cathodes are expected to be a good beam source for compact dielectric laser accelerators. For the electron beam divergence experiment, we have designed and assembled a test stand consisting of a DFEA cathode, a mesh anode, and a screen. We measured current and the size of the beam on the screen as functions of the distance between the cathode and the anode, the size of a pyramid’s base, and applied voltage on the cathode. In order to perform beam emittance measurements, we designed and fabricated a magnetic lens to be placed between the mesh and the screen. By measuring the size of the beam for different distances between the lens and the screen, we estimate the beam’s emittance. We also simulated the electron beam dynamics with Computer Simulation Technology Studio and General Particle Tracer codes. Experimentally measured divergence angles and normalized transverse emittance show good agreement with simulations.

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Keywords

Diamond field-emitter array

Cathode

Divergence

Emittance