First experience with He conditioning of a superconducting rf photoinjector
Abstract
The recent achievements in the performance of superconducting rf (SRF) photoinjectors have opened a new era in the development of reliable high-brightness cw electron sources. While the SRF guns become one of the most promising technologies, the compatibility of the SRF environment with the complex photocathodes remains at the forefront of the modern accelerator science. The SRF cavities operate at cryogenic temperatures providing the ultrahigh vacuum environment highly beneficial for the photocathode performance. However, the necessity to keep the photocathodes at room temperature while being surrounded by the cavity walls that are kept at cryogenic temperatures creates an additional complexity for the SRF gun design and operation. The complex and volatile chemical compounds used for photocathodes have a high chance of contaminating the surfaces of the SRF cavity. When deposited, such compounds could create centers for cold electron emission which degrade the performance of the SRF guns. Such a circumstance would require the development of the in-situ processing techniques for restoring the SRF cavity performance. This paper presents the results of the successful implementation and application of the He conditioning method for cavity restoration using the existing SRF photoinjector at Brookhaven National Laboratory (BNL). The method has proven to bemore »
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1885630
- Alternate Identifier(s):
- OSTI ID: 1870665
- Report Number(s):
- FERMILAB-PUB-22-382-TD; arXiv:2204.13555
Journal ID: ISSN 2469-9888; PRABCJ; 092001
- Grant/Contract Number:
- SC0021426; AC02-07CH11359
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 25 Journal Issue: 9; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; field emission; superconducting RF; electron sources
Citation Formats
Petrushina, I., Jing, Y., Litvinenko, V. N., Ma, J., Pinayev, I., Wang, G., Kayran, D., Severino, F., Narayan, G., Hayes, T., Brutus, J. C., Smart, L., Decker, K., and Belomestnykh, S. First experience with He conditioning of a superconducting rf photoinjector. United States: N. p., 2022.
Web. doi:10.1103/PhysRevAccelBeams.25.092001.
Petrushina, I., Jing, Y., Litvinenko, V. N., Ma, J., Pinayev, I., Wang, G., Kayran, D., Severino, F., Narayan, G., Hayes, T., Brutus, J. C., Smart, L., Decker, K., & Belomestnykh, S. First experience with He conditioning of a superconducting rf photoinjector. United States. https://doi.org/10.1103/PhysRevAccelBeams.25.092001
Petrushina, I., Jing, Y., Litvinenko, V. N., Ma, J., Pinayev, I., Wang, G., Kayran, D., Severino, F., Narayan, G., Hayes, T., Brutus, J. C., Smart, L., Decker, K., and Belomestnykh, S. Tue .
"First experience with He conditioning of a superconducting rf photoinjector". United States. https://doi.org/10.1103/PhysRevAccelBeams.25.092001.
@article{osti_1885630,
title = {First experience with He conditioning of a superconducting rf photoinjector},
author = {Petrushina, I. and Jing, Y. and Litvinenko, V. N. and Ma, J. and Pinayev, I. and Wang, G. and Kayran, D. and Severino, F. and Narayan, G. and Hayes, T. and Brutus, J. C. and Smart, L. and Decker, K. and Belomestnykh, S.},
abstractNote = {The recent achievements in the performance of superconducting rf (SRF) photoinjectors have opened a new era in the development of reliable high-brightness cw electron sources. While the SRF guns become one of the most promising technologies, the compatibility of the SRF environment with the complex photocathodes remains at the forefront of the modern accelerator science. The SRF cavities operate at cryogenic temperatures providing the ultrahigh vacuum environment highly beneficial for the photocathode performance. However, the necessity to keep the photocathodes at room temperature while being surrounded by the cavity walls that are kept at cryogenic temperatures creates an additional complexity for the SRF gun design and operation. The complex and volatile chemical compounds used for photocathodes have a high chance of contaminating the surfaces of the SRF cavity. When deposited, such compounds could create centers for cold electron emission which degrade the performance of the SRF guns. Such a circumstance would require the development of the in-situ processing techniques for restoring the SRF cavity performance. This paper presents the results of the successful implementation and application of the He conditioning method for cavity restoration using the existing SRF photoinjector at Brookhaven National Laboratory (BNL). The method has proven to be extremely effective and resulted in a dramatic improvement in the BNL gun performance.},
doi = {10.1103/PhysRevAccelBeams.25.092001},
journal = {Physical Review Accelerators and Beams},
number = 9,
volume = 25,
place = {United States},
year = {Tue Sep 06 00:00:00 EDT 2022},
month = {Tue Sep 06 00:00:00 EDT 2022}
}
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https://doi.org/10.1103/PhysRevAccelBeams.25.092001
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