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Title: Thermal emittance and lifetime of alkali-antimonide photocathodes grown on GaAs and molybdenum substrates evaluated in a –300 kV dc photogun

Abstract

In this work, CsxKySb photocathodes grown on GaAs and molybdenum substrates were evaluated using a –300 kV dc high voltage photogun and diagnostic beam line. Photocathodes grown on GaAs substrates, with varying antimony layer thickness (estimated range from <20 nm to >1 um), yielded similar thermal emittance per rms laser spot size values (~0.4 mmmrad=mm) but very different operating lifetime. Similar thermal emittance was obtained for a photocathode grown on a molybdenum substrate but with markedly improved lifetime. For this photocathode, no decay in quantum efficiency was measured at 4.5 mA average current and with peak current 0.55 A at the photocathode.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1670828
Alternate Identifier(s):
OSTI ID: 1670990
Report Number(s):
JLAB-ACO-20-3246; DOE/OR/23177-5050
Journal ID: ISSN 2469-9888; PRABCJ; 103401
Grant/Contract Number:  
AC05-06OR23177
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: 10; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Wang, Y., Mamun, M. A., Adderley, P., Bullard, B., Grames, J., Hansknecht, J., Hernandez-Garcia, C., Kazimi, R., Krafft, G. A., Palacios-Serrano, G., Poelker, M., Stutzman, M. L., Suleiman, R., Tiefenback, M., Wijethunga, S., Yoskowitz, J., and Zhang, S. Thermal emittance and lifetime of alkali-antimonide photocathodes grown on GaAs and molybdenum substrates evaluated in a –300 kV dc photogun. United States: N. p., 2020. Web. doi:10.1103/PhysRevAccelBeams.23.103401.
Wang, Y., Mamun, M. A., Adderley, P., Bullard, B., Grames, J., Hansknecht, J., Hernandez-Garcia, C., Kazimi, R., Krafft, G. A., Palacios-Serrano, G., Poelker, M., Stutzman, M. L., Suleiman, R., Tiefenback, M., Wijethunga, S., Yoskowitz, J., & Zhang, S. Thermal emittance and lifetime of alkali-antimonide photocathodes grown on GaAs and molybdenum substrates evaluated in a –300 kV dc photogun. United States. doi:10.1103/PhysRevAccelBeams.23.103401.
Wang, Y., Mamun, M. A., Adderley, P., Bullard, B., Grames, J., Hansknecht, J., Hernandez-Garcia, C., Kazimi, R., Krafft, G. A., Palacios-Serrano, G., Poelker, M., Stutzman, M. L., Suleiman, R., Tiefenback, M., Wijethunga, S., Yoskowitz, J., and Zhang, S. Wed . "Thermal emittance and lifetime of alkali-antimonide photocathodes grown on GaAs and molybdenum substrates evaluated in a –300 kV dc photogun". United States. doi:10.1103/PhysRevAccelBeams.23.103401.
@article{osti_1670828,
title = {Thermal emittance and lifetime of alkali-antimonide photocathodes grown on GaAs and molybdenum substrates evaluated in a –300 kV dc photogun},
author = {Wang, Y. and Mamun, M. A. and Adderley, P. and Bullard, B. and Grames, J. and Hansknecht, J. and Hernandez-Garcia, C. and Kazimi, R. and Krafft, G. A. and Palacios-Serrano, G. and Poelker, M. and Stutzman, M. L. and Suleiman, R. and Tiefenback, M. and Wijethunga, S. and Yoskowitz, J. and Zhang, S.},
abstractNote = {In this work, CsxKySb photocathodes grown on GaAs and molybdenum substrates were evaluated using a –300 kV dc high voltage photogun and diagnostic beam line. Photocathodes grown on GaAs substrates, with varying antimony layer thickness (estimated range from <20 nm to >1 um), yielded similar thermal emittance per rms laser spot size values (~0.4 mmmrad=mm) but very different operating lifetime. Similar thermal emittance was obtained for a photocathode grown on a molybdenum substrate but with markedly improved lifetime. For this photocathode, no decay in quantum efficiency was measured at 4.5 mA average current and with peak current 0.55 A at the photocathode.},
doi = {10.1103/PhysRevAccelBeams.23.103401},
journal = {Physical Review Accelerators and Beams},
number = 10,
volume = 23,
place = {United States},
year = {2020},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.23.103401

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