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Title: 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 » earlier results, provided the bunches are short compared to the dechirper gap, which is normally the regime of interest.« less

Authors:
 [1];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., 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. https://doi.org/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:

Using surface impedance for calculating wakefields in flat geometry
journal, March 2015


Corrugated pipe as a beam dechirper
journal, October 2012

  • Bane, K. L. F.; Stupakov, G.
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  • DOI: 10.1016/j.nima.2012.07.001

Experimental Demonstration of Energy-Chirp Control in Relativistic Electron Bunches Using a Corrugated Pipe
journal, January 2014


Electron beam energy chirp control with a rectangular corrugated structure at the Linac Coherent Light Source
journal, January 2015

  • Zhang, Zhen; Bane, Karl; Ding, Yuantao
  • Physical Review Special Topics - Accelerators and Beams, Vol. 18, Issue 1
  • DOI: 10.1103/PhysRevSTAB.18.010702

Wakefield potentials of corrugated structures
journal, October 2015


Impedance of a rectangular beam tube with small corrugations
journal, February 2003


Calculation of wakefields in 2D rectangular structures
journal, October 2015

  • Zagorodnov, I.; Bane, K. L. F.; Stupakov, G.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 18, Issue 10
  • DOI: 10.1103/PhysRevSTAB.18.104401

Some Considerations Concerning the Transverse Deflection of Charged Particles in Radio‐Frequency Fields
journal, November 1956

  • Panofsky, W. K. H.; Wenzel, W. A.
  • Review of Scientific Instruments, Vol. 27, Issue 11
  • DOI: 10.1063/1.1715427

    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
    • DOI: 10.1038/nphoton.2016.201

    Analytical treatment of the wakefields driven by transversely shaped beams in a planar slow-wave structure
    journal, December 2018