Experimental observation of high-brightness microbunching in a photocathode rf electron gun
Abstract
We report the measurement of very short, high-brightness bunches of electrons produced in a photocathode rf gun with no magnetic compression. The electron beam bunch length and the charge distribution along the bunch were measured by passing the energy chirped the electron beam through a momentum selection slit while varying the phase of the rf linac. The bunch compression as a function of rf gun phase and electric field at the cathode were investigated. The shortest measured bunch is 370\ifmmode\pm\else\textpm\fi{}100 fs (at 95% of the charge) with 2.5\ifmmode\times\else\texttimes\fi{}${10}^{8}$ electrons (170 A peak current); the normalized rms emittance of this beam was measured to be $0.5\ensuremath{\pi}$ mm mrad and the energy spread is 0.15%.
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Many applications including high energy physics and radiation sources require monoenergetic beams (percent energy spread or less) with at least 10^9 electrons.
“While these beams are useful for some users 9 , many applications including high energy physics and radiation sources require monoenergetic beams (percent energy spread or less) with at least 10 9 electrons [10][11][12][13] .”
From High-quality electron beams from a laser wakefield accelerator using plasma-channel guiding (2004) · cites this paper as [12]
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High-quality electron beams from a laser wakefield accelerator using plasma-channel guiding
Geddes, C. G. R., Toth, C., van Tilborg, J., Esarey, E., Schroeder, C. B., Bruhwiler, D., Nieter, C., Cary, J., & Leemans, W. P. (2004) · Nature · doi:10.1038/nature02900 · Cited by 2,001 · see citing works
- Authors
- Wang, X. J., Qiu, X., & Ben-Zvi, I.
- Affiliations
- Brookhaven National Laboratory (US)
- ORCID
- Wang, X. J.
- Venue
- Physical Review E
- Publisher
- American Physical Society (APS)
- Published
- 1996-10-01
- Volume
- 54
- Issue
- 4
- Pages
- R3121-R3124
- ISSN
- 1063-651X (ISSN-L)
- 1095-3787
- OpenAlex
- W2085257757
- Cited by
- 125
- References
- 0
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 3 · 2019: 3 · 2018: 2 · 2017: 3 · 2016: 7 · 2015: 5 · 2014: 7 · 2013: 3 · 2012: 4
- FWCI
- 6.30
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Particle Accelerators and Free-Electron Lasers
- Physical Sciences › Engineering › Aerospace Engineering › Particle accelerators and beam dynamics
- Physical Sciences › Engineering › Biomedical Engineering › Photocathodes and Microchannel Plates
- Keywords
- microbunching, bunch compression, bunch length, charge distribution, normalized emittance, energy spread, RF phase, high-brightness electron beams
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