Bi-alkali antimonide photocathode growth: An X-ray diffraction study
Abstract
Bi-alkali antimonide photocathodes are one of the best known sources of electrons for high current and/or high bunch charge applications like Energy Recovery Linacs or Free Electron Lasers. Despite their high quantum efficiency in visible light and low intrinsic emittance, the surface roughness of these photocathodes prohibits their use as low emittance cathodes in high accelerating gradient superconducting and normal conducting radio frequency photoguns and limits the minimum possible intrinsic emittance near the threshold. Also, the growth process for these materials is largely based on recipes obtained by trial and error and is very unreliable. In this paper, using X-ray diffraction, we investigate the different structural and chemical changes that take place during the growth process of the bi-alkali antimonide material K2CsSb. Our measurements give us a deeper understanding of the growth process of alkali-antimonide photocathodes allowing us to optimize it with the goal of minimizing the surface roughness to preserve the intrinsic emittance at high electric fields and increasing its reproducibility.
- Authors:
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1340402
- Report Number(s):
- BNL-113173-2016-JA
Journal ID: ISSN 0021-8979; KA-04
- DOE Contract Number:
- SC00112704
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 3; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Citation Formats
Schubert, Susanne, Wong, Jared, Feng, Jun, Karkare, Siddharth, Padmore, Howard, Ruiz-Osés, Miguel, Smedley, John, Muller, Erik, Ding, Zihao, Gaowei, Mengjia, Attenkofer, Klaus, Liang, Xue, Xie, Junqi, and Kühn, Julius. Bi-alkali antimonide photocathode growth: An X-ray diffraction study. United States: N. p., 2016.
Web. doi:10.1063/1.4959218.
Schubert, Susanne, Wong, Jared, Feng, Jun, Karkare, Siddharth, Padmore, Howard, Ruiz-Osés, Miguel, Smedley, John, Muller, Erik, Ding, Zihao, Gaowei, Mengjia, Attenkofer, Klaus, Liang, Xue, Xie, Junqi, & Kühn, Julius. Bi-alkali antimonide photocathode growth: An X-ray diffraction study. United States. https://doi.org/10.1063/1.4959218
Schubert, Susanne, Wong, Jared, Feng, Jun, Karkare, Siddharth, Padmore, Howard, Ruiz-Osés, Miguel, Smedley, John, Muller, Erik, Ding, Zihao, Gaowei, Mengjia, Attenkofer, Klaus, Liang, Xue, Xie, Junqi, and Kühn, Julius. 2016.
"Bi-alkali antimonide photocathode growth: An X-ray diffraction study". United States. https://doi.org/10.1063/1.4959218.
@article{osti_1340402,
title = {Bi-alkali antimonide photocathode growth: An X-ray diffraction study},
author = {Schubert, Susanne and Wong, Jared and Feng, Jun and Karkare, Siddharth and Padmore, Howard and Ruiz-Osés, Miguel and Smedley, John and Muller, Erik and Ding, Zihao and Gaowei, Mengjia and Attenkofer, Klaus and Liang, Xue and Xie, Junqi and Kühn, Julius},
abstractNote = {Bi-alkali antimonide photocathodes are one of the best known sources of electrons for high current and/or high bunch charge applications like Energy Recovery Linacs or Free Electron Lasers. Despite their high quantum efficiency in visible light and low intrinsic emittance, the surface roughness of these photocathodes prohibits their use as low emittance cathodes in high accelerating gradient superconducting and normal conducting radio frequency photoguns and limits the minimum possible intrinsic emittance near the threshold. Also, the growth process for these materials is largely based on recipes obtained by trial and error and is very unreliable. In this paper, using X-ray diffraction, we investigate the different structural and chemical changes that take place during the growth process of the bi-alkali antimonide material K2CsSb. Our measurements give us a deeper understanding of the growth process of alkali-antimonide photocathodes allowing us to optimize it with the goal of minimizing the surface roughness to preserve the intrinsic emittance at high electric fields and increasing its reproducibility.},
doi = {10.1063/1.4959218},
url = {https://www.osti.gov/biblio/1340402},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 3,
volume = 120,
place = {United States},
year = {Thu Jul 21 00:00:00 EDT 2016},
month = {Thu Jul 21 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Perspectives on Designer Photocathodes for X-ray Free-Electron Lasers: Influencing Emission Properties with Heterostructures and Nanoengineered Electronic States
journal, October 2018
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Electronic structure and core electron fingerprints of caesium-based multi-alkali antimonides for ultra-bright electron sources
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