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Title: Modeling of diamond field emitter arrays for a compact source of high brightness electron beams

Abstract

Many applications, such as compact accelerators and electron microscopy, demand high brightness electron beams with small source size and ultralow emittance. Diamond emitters manufactured with semiconductor processes can be employed in such compact beam sources. The micrometer-scale pyramid structure of the emitter allows enhancement of the external field compared to that at the substrate, leading to electron emission with small beam size. We investigate the dependence of the field enhancement on the shape of the emitter and the resulting emission characteristics. The beam formation and dynamics are simulated with the LSP particle-in-cell code to obtain the macroscopic observables. To account for the semiconductor charge transport in the bulk material and the tunneling through the surface, a first-principle semiclassical Monte Carlo emission model is developed and applied to the diamond pyramid. Using this Monte Carlo emission model and the result from the geometric field enhancement calculation, we construct a simple model to qualitatively explain the measured emission characteristics. In conclusion, a comparison between our model and experiments indicates that the beam current is mostly emitted at the apex of the emitter.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1511625
Alternate Identifier(s):
OSTI ID: 1508185
Report Number(s):
LA-UR-18-31776
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
89233218CNA000001; 20170006DR
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 16; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; diamond field emitter; emission model; numerical simulation

Citation Formats

Huang, C. -K., Andrews, Heather Lynn, Baker, Ryan Christopher, Fleming, Ryan Lee, Kim, Donsung, Kwan, Thomas J. T., Piryatinski, Andrei, Pavlenko, Vitaly, and Simakov, Evgenya Ivanovna. Modeling of diamond field emitter arrays for a compact source of high brightness electron beams. United States: N. p., 2019. Web. doi:10.1063/1.5086292.
Huang, C. -K., Andrews, Heather Lynn, Baker, Ryan Christopher, Fleming, Ryan Lee, Kim, Donsung, Kwan, Thomas J. T., Piryatinski, Andrei, Pavlenko, Vitaly, & Simakov, Evgenya Ivanovna. Modeling of diamond field emitter arrays for a compact source of high brightness electron beams. United States. doi:10.1063/1.5086292.
Huang, C. -K., Andrews, Heather Lynn, Baker, Ryan Christopher, Fleming, Ryan Lee, Kim, Donsung, Kwan, Thomas J. T., Piryatinski, Andrei, Pavlenko, Vitaly, and Simakov, Evgenya Ivanovna. Mon . "Modeling of diamond field emitter arrays for a compact source of high brightness electron beams". United States. doi:10.1063/1.5086292.
@article{osti_1511625,
title = {Modeling of diamond field emitter arrays for a compact source of high brightness electron beams},
author = {Huang, C. -K. and Andrews, Heather Lynn and Baker, Ryan Christopher and Fleming, Ryan Lee and Kim, Donsung and Kwan, Thomas J. T. and Piryatinski, Andrei and Pavlenko, Vitaly and Simakov, Evgenya Ivanovna},
abstractNote = {Many applications, such as compact accelerators and electron microscopy, demand high brightness electron beams with small source size and ultralow emittance. Diamond emitters manufactured with semiconductor processes can be employed in such compact beam sources. The micrometer-scale pyramid structure of the emitter allows enhancement of the external field compared to that at the substrate, leading to electron emission with small beam size. We investigate the dependence of the field enhancement on the shape of the emitter and the resulting emission characteristics. The beam formation and dynamics are simulated with the LSP particle-in-cell code to obtain the macroscopic observables. To account for the semiconductor charge transport in the bulk material and the tunneling through the surface, a first-principle semiclassical Monte Carlo emission model is developed and applied to the diamond pyramid. Using this Monte Carlo emission model and the result from the geometric field enhancement calculation, we construct a simple model to qualitatively explain the measured emission characteristics. In conclusion, a comparison between our model and experiments indicates that the beam current is mostly emitted at the apex of the emitter.},
doi = {10.1063/1.5086292},
journal = {Journal of Applied Physics},
number = 16,
volume = 125,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 22, 2020
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