Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes
Abstract
Advanced photoinjectors, which are critical to many next generation accelerators, open the door to new ways of material probing, both as injectors for free electron lasers and for ultra-fast electron diffraction. For these applications, the nonuniformity of the electric field near the cathode caused by surface roughness can be the dominant source of beam emittance. Therefore, improving the photocathode roughness while maintaining quantum efficiency is essential to the improvement of beam brightness. Here in this article, we report the demonstration of a bi-alkali antimonide photocathode with an order of magnitude improved roughness by sputter deposition from a K2CsSb sputter target, using in situ and operando X-ray characterizations. We found that a surface roughness of 0.5 nm for a sputtered photocathode with a final thickness of 42 nm can be achieved while still yielding a quantum efficiency of 3.3% at 530 nm wavelength.
- Authors:
-
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Stony Brook University, NY (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Radiation Monitoring Devices, Watertown, MA (United States)
- Helmholtz-Zentrum Berlin (HZB), (Germany)
- University of Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1261186
- Alternate Identifier(s):
- OSTI ID: 1421047; OSTI ID: 1425174; OSTI ID: 1487081
- Report Number(s):
- BNL-200031-2018-JAAM
Journal ID: ISSN 2166-532X; RMD C14-29
- Grant/Contract Number:
- SC0009540; AC02-05CH11231; SC0012704; SC0017202; SC0017693
- Resource Type:
- Accepted Manuscript
- Journal Name:
- APL Materials
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 11; Journal ID: ISSN 2166-532X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; 36 MATERIALS SCIENCE; photocathodes; photodetectors; sputter deposition; accelerated beams; electron diffraction
Citation Formats
Gaowei, M., Ding, Z., Schubert, S., Bhandari, H. B., Sinsheimer, J., Kuehn, J., Nagarkar, V. V., Marshall, M. J., Walsh, J., Muller, E. M., Attenkofer, K., Frisch, H. J., Padmore, H., and Smedley, J. Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes. United States: N. p., 2017.
Web. doi:10.1063/1.5010950.
Gaowei, M., Ding, Z., Schubert, S., Bhandari, H. B., Sinsheimer, J., Kuehn, J., Nagarkar, V. V., Marshall, M. J., Walsh, J., Muller, E. M., Attenkofer, K., Frisch, H. J., Padmore, H., & Smedley, J. Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes. United States. https://doi.org/10.1063/1.5010950
Gaowei, M., Ding, Z., Schubert, S., Bhandari, H. B., Sinsheimer, J., Kuehn, J., Nagarkar, V. V., Marshall, M. J., Walsh, J., Muller, E. M., Attenkofer, K., Frisch, H. J., Padmore, H., and Smedley, J. Fri .
"Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes". United States. https://doi.org/10.1063/1.5010950. https://www.osti.gov/servlets/purl/1261186.
@article{osti_1261186,
title = {Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes},
author = {Gaowei, M. and Ding, Z. and Schubert, S. and Bhandari, H. B. and Sinsheimer, J. and Kuehn, J. and Nagarkar, V. V. and Marshall, M. J. and Walsh, J. and Muller, E. M. and Attenkofer, K. and Frisch, H. J. and Padmore, H. and Smedley, J.},
abstractNote = {Advanced photoinjectors, which are critical to many next generation accelerators, open the door to new ways of material probing, both as injectors for free electron lasers and for ultra-fast electron diffraction. For these applications, the nonuniformity of the electric field near the cathode caused by surface roughness can be the dominant source of beam emittance. Therefore, improving the photocathode roughness while maintaining quantum efficiency is essential to the improvement of beam brightness. Here in this article, we report the demonstration of a bi-alkali antimonide photocathode with an order of magnitude improved roughness by sputter deposition from a K2CsSb sputter target, using in situ and operando X-ray characterizations. We found that a surface roughness of 0.5 nm for a sputtered photocathode with a final thickness of 42 nm can be achieved while still yielding a quantum efficiency of 3.3% at 530 nm wavelength.},
doi = {10.1063/1.5010950},
journal = {APL Materials},
number = 11,
volume = 5,
place = {United States},
year = {Fri Nov 10 00:00:00 EST 2017},
month = {Fri Nov 10 00:00:00 EST 2017}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
Electronic structure and core electron fingerprints of caesium-based multi-alkali antimonides for ultra-bright electron sources
journal, December 2019
- Cocchi, Caterina; Mistry, Sonal; Schmeißer, Martin
- Scientific Reports, Vol. 9, Issue 1
Figures / Tables found in this record: