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

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. Here, we also simulated the electron beam dynamics with Computer Simulation Technology Studio and General Particle Tracer codes. Experimentally measured divergence anglesmore » and normalized transverse emittance show good agreement with simulations.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [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)
  2. Cheju Halla Univ., Jeju-si (South Korea)
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:
1574002
Report Number(s):
LA-UR-19-30904
Journal ID: ISSN 0168-9002
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Accelerator Design, Technology, and Operations; Diamond field-emitter array; Cathode; Divergence; Emittance

Citation Formats

Kim, Dongsung, Andrews, Heather Lynn, Choi, Bo Kyoung, Fleming, Ryan Lee, Huang, C. -K., Kwan, Thomas J. T., Lewellen, IV, John W., Nichols, Kimberley, Pavlenko, Vitaly, and Simakov, Evgenya Ivanovna. Divergence study and emittance measurements for the electron beam emitted from a diamond pyramid. United States: N. p., 2019. Web. doi:10.1016/j.nima.2019.163055.
Kim, Dongsung, Andrews, Heather Lynn, Choi, Bo Kyoung, Fleming, Ryan Lee, Huang, C. -K., Kwan, Thomas J. T., Lewellen, IV, John W., Nichols, Kimberley, Pavlenko, Vitaly, & Simakov, Evgenya Ivanovna. Divergence study and emittance measurements for the electron beam emitted from a diamond pyramid. United States. doi:10.1016/j.nima.2019.163055.
Kim, Dongsung, Andrews, Heather Lynn, Choi, Bo Kyoung, Fleming, Ryan Lee, Huang, C. -K., Kwan, Thomas J. T., Lewellen, IV, John W., Nichols, Kimberley, Pavlenko, Vitaly, and Simakov, Evgenya Ivanovna. Thu . "Divergence study and emittance measurements for the electron beam emitted from a diamond pyramid". United States. doi:10.1016/j.nima.2019.163055.
@article{osti_1574002,
title = {Divergence study and emittance measurements for the electron beam emitted from a diamond pyramid},
author = {Kim, Dongsung and Andrews, Heather Lynn and Choi, Bo Kyoung and Fleming, Ryan Lee and Huang, C. -K. and Kwan, Thomas J. T. and Lewellen, IV, John W. and Nichols, Kimberley and Pavlenko, Vitaly and Simakov, Evgenya Ivanovna},
abstractNote = {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. Here, 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.},
doi = {10.1016/j.nima.2019.163055},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {10}
}

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This content will become publicly available on October 31, 2020
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