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Title: Long lifetime polarized electron beam production from negative electron affinity GaAs activated with Sb-Cs-O: Trade-offs between efficiency, spin polarization, and lifetime

Abstract

GaAs-based photocathodes are the state-of-the-art in the production of highly spin-polarized electron beams for accelerator and microscopy applications. While various novel structures of GaAs have been shown to increase the degree of polarization and quantum efficiency, all GaAs-based photocathodes require activation to negative electron affinity (NEA) to operate at the photon energies where the highest spin polarization is achieved. In this work, we report on NEA activation of bulk GaAs performed using Sb-CsO. We show this activation layer to be more robust with respect to traditional Cs and O layer in terms of charge extraction lifetime. This new activation layer is shown to improve the dark lifetime up to one order of magnitude and the charge extraction lifetime up to a factor of about 60, when compared with the traditional Cs-O activating layer. Trade-offs with other relevant parameters like quantum efficiency and electron spin polarization are also discussed.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo; ; ;
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1598736
Alternate Identifier(s):
OSTI ID: 1803573
Grant/Contract Number:  
SC0019122
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 23 Journal Issue: 2; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics

Citation Formats

Cultrera, Luca, Galdi, Alice, Bae, Jai Kwan, Ikponmwen, Frank, Maxson, Jared, and Bazarov, Ivan. Long lifetime polarized electron beam production from negative electron affinity GaAs activated with Sb-Cs-O: Trade-offs between efficiency, spin polarization, and lifetime. United States: N. p., 2020. Web. doi:10.1103/PhysRevAccelBeams.23.023401.
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Cultrera, Luca, Galdi, Alice, Bae, Jai Kwan, Ikponmwen, Frank, Maxson, Jared, & Bazarov, Ivan. Long lifetime polarized electron beam production from negative electron affinity GaAs activated with Sb-Cs-O: Trade-offs between efficiency, spin polarization, and lifetime. United States. https://doi.org/10.1103/PhysRevAccelBeams.23.023401
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Cultrera, Luca, Galdi, Alice, Bae, Jai Kwan, Ikponmwen, Frank, Maxson, Jared, and Bazarov, Ivan. Mon . "Long lifetime polarized electron beam production from negative electron affinity GaAs activated with Sb-Cs-O: Trade-offs between efficiency, spin polarization, and lifetime". United States. https://doi.org/10.1103/PhysRevAccelBeams.23.023401.
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@article{osti_1598736,
title = {Long lifetime polarized electron beam production from negative electron affinity GaAs activated with Sb-Cs-O: Trade-offs between efficiency, spin polarization, and lifetime},
author = {Cultrera, Luca and Galdi, Alice and Bae, Jai Kwan and Ikponmwen, Frank and Maxson, Jared and Bazarov, Ivan},
abstractNote = {GaAs-based photocathodes are the state-of-the-art in the production of highly spin-polarized electron beams for accelerator and microscopy applications. While various novel structures of GaAs have been shown to increase the degree of polarization and quantum efficiency, all GaAs-based photocathodes require activation to negative electron affinity (NEA) to operate at the photon energies where the highest spin polarization is achieved. In this work, we report on NEA activation of bulk GaAs performed using Sb-CsO. We show this activation layer to be more robust with respect to traditional Cs and O layer in terms of charge extraction lifetime. This new activation layer is shown to improve the dark lifetime up to one order of magnitude and the charge extraction lifetime up to a factor of about 60, when compared with the traditional Cs-O activating layer. Trade-offs with other relevant parameters like quantum efficiency and electron spin polarization are also discussed.},
doi = {10.1103/PhysRevAccelBeams.23.023401},
journal = {Physical Review Accelerators and Beams},
number = 2,
volume = 23,
place = {United States},
year = {2020},
month = {2}
}
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https://doi.org/10.1103/PhysRevAccelBeams.23.023401
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