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Title: Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs 2 Te coating

Abstract

Photocathodes capable of providing high intensity and highly spin-polarized electron beams with long operational lifetimes are of great interest for the next generation nuclear physics facilities like Electron Ion Colliders. Here, we report on GaAs photocathodes activated by Cs 2Te, a material well known for its robustness. GaAs activated by Cs 2Te forms Negative Electron Affinity, and the lifetime for extracted charge is improved by a factor of 5 compared to that of GaAs activated by Cs and O 2. The spin polarization of photoelectrons was measured using a Mott polarimeter and found to be independent from the activation method, thereby shifting the paradigm on spin-polarized electron sources employing photocathodes with robust coatings.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1]
  1. Cornell Univ., Ithaca, NY (United States). Cornell Lab. for Accelerator-Based Sciences and Education
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540196
Alternate Identifier(s):
OSTI ID: 1432414
Grant/Contract Number:  
SC0016203
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 15; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Physics

Citation Formats

Bae, Jai Kwan, Cultrera, Luca, DiGiacomo, Philip, and Bazarov, Ivan. Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs2 Te coating. United States: N. p., 2018. Web. doi:10.1063/1.5026701.
Bae, Jai Kwan, Cultrera, Luca, DiGiacomo, Philip, & Bazarov, Ivan. Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs2 Te coating. United States. doi:10.1063/1.5026701.
Bae, Jai Kwan, Cultrera, Luca, DiGiacomo, Philip, and Bazarov, Ivan. Mon . "Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs2 Te coating". United States. doi:10.1063/1.5026701. https://www.osti.gov/servlets/purl/1540196.
@article{osti_1540196,
title = {Rugged spin-polarized electron sources based on negative electron affinity GaAs photocathode with robust Cs2 Te coating},
author = {Bae, Jai Kwan and Cultrera, Luca and DiGiacomo, Philip and Bazarov, Ivan},
abstractNote = {Photocathodes capable of providing high intensity and highly spin-polarized electron beams with long operational lifetimes are of great interest for the next generation nuclear physics facilities like Electron Ion Colliders. Here, we report on GaAs photocathodes activated by Cs2Te, a material well known for its robustness. GaAs activated by Cs2Te forms Negative Electron Affinity, and the lifetime for extracted charge is improved by a factor of 5 compared to that of GaAs activated by Cs and O2. The spin polarization of photoelectrons was measured using a Mott polarimeter and found to be independent from the activation method, thereby shifting the paradigm on spin-polarized electron sources employing photocathodes with robust coatings.},
doi = {10.1063/1.5026701},
journal = {Applied Physics Letters},
number = 15,
volume = 112,
place = {United States},
year = {2018},
month = {4}
}

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    Works referencing / citing this record:

    Low energy photoemission from (100) Ba1−xLaxSnO3 thin films for photocathode applications
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    • Galdi, Alice; Pierce, Christopher M.; Cultrera, L.
    • The European Physical Journal Special Topics, Vol. 228, Issue 3
    • DOI: 10.1140/epjst/e2019-800175-x