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

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

doi:10.1016/j.nima.2019.163055

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

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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 »« less

Authors:

^[1];

^[1]; Choi, Bo Kyoung ^[2];

^[1];

^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Cheju Halla Univ., Jeju-si (South Korea)

Publication Date:: Thu Oct 31 00:00:00 EDT 2019

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE Laboratory Directed Research and Development (LDRD) Program

OSTI Identifier:: 1574002

Alternate Identifier(s):: OSTI ID: 1702596

Report Number(s):: LA-UR-19-30904
Journal ID: ISSN 0168-9002; TRN: US2001440

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 Volume: 953; Journal Issue: C; Journal ID: ISSN 0168-9002

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Accelerator Design, Technology, and Operations; Diamond field-emitter array; Cathode; Divergence; Emittance

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                    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.

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                    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.  https://doi.org/10.1016/j.nima.2019.163055

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                    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.  https://doi.org/10.1016/j.nima.2019.163055.  https://www.osti.gov/servlets/purl/1574002.

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@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       = C,

  volume       = 953,

  place        = {United States},

  year         = {Thu Oct 31 00:00:00 EDT 2019},

  month        = {Thu Oct 31 00:00:00 EDT 2019}

}

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