Dechirper wakefields for short bunches
Abstract
In previous work (Bane and Stupakov, 2015) general expressions, valid for arbitrary bunch lengths, were derived for the wakefields of corrugated structures with flat geometry, such as is used in the RadiaBeam/LCLS dechirper. However, the bunch at the end of linac-based X-ray FELs—like the LCLS—is extremely short, and for short bunches the wakes can be considerably simplified. In this work, we first derive analytical approximations to the short-range wakes. These are generalized wakes, in the sense that their validity is not limited to a small neighborhood of the symmetry axis, but rather extends to arbitrary transverse offsets of driving and test particles. The validity of these short-bunch wakes holds not only for the corrugated structure, but rather for any flat structure whose beam-cavity interaction can be described by a surface impedance. We use these wakes to obtain, for a short bunch passing through a dechirper: estimates of the energy loss as function of gap, the transverse kick as a function of beam offset, the slice energy spread increase, and the emittance growth. In the Appendix, a more accurate derivation—than that is found in Bane and Stupakov (2015)—of the arbitrary bunch length wakes is performed; we find full agreement with themore »
- Authors:
-
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1605006
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
- Additional Journal Information:
- Journal Volume: 820; Journal Issue: C; Journal ID: ISSN 0168-9002
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Wakefields; Impedance; Corrugated structure; Short bunches; Longitudinal phase space control
Citation Formats
Bane, Karl, and Stupakov, Gennady. Dechirper wakefields for short bunches. United States: N. p., 2016.
Web. doi:10.1016/j.nima.2016.02.055.
Bane, Karl, & Stupakov, Gennady. Dechirper wakefields for short bunches. United States. https://doi.org/10.1016/j.nima.2016.02.055
Bane, Karl, and Stupakov, Gennady. Sun .
"Dechirper wakefields for short bunches". United States. https://doi.org/10.1016/j.nima.2016.02.055. https://www.osti.gov/servlets/purl/1605006.
@article{osti_1605006,
title = {Dechirper wakefields for short bunches},
author = {Bane, Karl and Stupakov, Gennady},
abstractNote = {In previous work (Bane and Stupakov, 2015) general expressions, valid for arbitrary bunch lengths, were derived for the wakefields of corrugated structures with flat geometry, such as is used in the RadiaBeam/LCLS dechirper. However, the bunch at the end of linac-based X-ray FELs—like the LCLS—is extremely short, and for short bunches the wakes can be considerably simplified. In this work, we first derive analytical approximations to the short-range wakes. These are generalized wakes, in the sense that their validity is not limited to a small neighborhood of the symmetry axis, but rather extends to arbitrary transverse offsets of driving and test particles. The validity of these short-bunch wakes holds not only for the corrugated structure, but rather for any flat structure whose beam-cavity interaction can be described by a surface impedance. We use these wakes to obtain, for a short bunch passing through a dechirper: estimates of the energy loss as function of gap, the transverse kick as a function of beam offset, the slice energy spread increase, and the emittance growth. In the Appendix, a more accurate derivation—than that is found in Bane and Stupakov (2015)—of the arbitrary bunch length wakes is performed; we find full agreement with the earlier results, provided the bunches are short compared to the dechirper gap, which is normally the regime of interest.},
doi = {10.1016/j.nima.2016.02.055},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 820,
place = {United States},
year = {2016},
month = {3}
}
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Works referenced in this record:
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journal, March 2015
- Bane, Karl; Stupakov, Gennady
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Works referencing / citing this record:
Fresh-slice multicolour X-ray free-electron lasers
journal, October 2016
- Lutman, Alberto A.; Maxwell, Timothy J.; MacArthur, James P.
- Nature Photonics, Vol. 10, Issue 11
Analytical treatment of the wakefields driven by transversely shaped beams in a planar slow-wave structure
journal, December 2018
- Baturin, S. S.; Andonian, G.; Rosenzweig, J. B.
- Physical Review Accelerators and Beams, Vol. 21, Issue 12
Corrugated structure insertion for extending the SASE bandwidth up to 3% at the European XFEL
text, January 2016
- Zagorodnov, I.; Feng, G.; Limberg, T.
- arXiv