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Title: Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source

Abstract

The RadiaBeam/SLAC dechirper, a structure consisting of pairs of flat, metallic, corrugated plates, has been installed just upstream of the undulators in the Linac Coherent Light Source (LCLS). As a dechirper, with the beam passing between the plates on axis, longitudinal wakefields are induced that can remove unwanted energy chirp in the beam. However, with the beam passing off axis, strong transverse wakes are also induced. This mode of operation has already been used for the production of intense, multicolor photon beams using the fresh-slice technique, and is being used to develop a diagnostic for attosecond bunch length measurements. Here we measure, as a function of offset, the strength of the transverse wakefields that are excited between the two plates, and also for the case of the beam passing near to a single plate. We compare with analytical formulas from the literature, and find good agreement. As a result, this report presents the first systematic measurements of the transverse wake strength in a dechirper, one that has been excited by a bunch with the short pulse duration and high energy found in an x-ray free electron laser.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1400341
Alternate Identifier(s):
OSTI ID: 1417670
Grant/Contract Number:  
AC02-76SF00515; SC0009550
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 20 Journal Issue: 10; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Zemella, Johann, Bane, Karl, Fisher, Alan, Guetg, Marc, Huang, Zhirong, Iverson, Richard, Krejcik, Patrick, Lutman, Alberto, Maxwell, Timothy, Novokhatski, Alexander, Stupakov, Gennady, Zhang, Zhen, Harrison, Mark, and Ruelas, Marcos. Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.104403.
Zemella, Johann, Bane, Karl, Fisher, Alan, Guetg, Marc, Huang, Zhirong, Iverson, Richard, Krejcik, Patrick, Lutman, Alberto, Maxwell, Timothy, Novokhatski, Alexander, Stupakov, Gennady, Zhang, Zhen, Harrison, Mark, & Ruelas, Marcos. Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source. United States. https://doi.org/10.1103/PhysRevAccelBeams.20.104403
Zemella, Johann, Bane, Karl, Fisher, Alan, Guetg, Marc, Huang, Zhirong, Iverson, Richard, Krejcik, Patrick, Lutman, Alberto, Maxwell, Timothy, Novokhatski, Alexander, Stupakov, Gennady, Zhang, Zhen, Harrison, Mark, and Ruelas, Marcos. Thu . "Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source". United States. https://doi.org/10.1103/PhysRevAccelBeams.20.104403.
@article{osti_1400341,
title = {Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source},
author = {Zemella, Johann and Bane, Karl and Fisher, Alan and Guetg, Marc and Huang, Zhirong and Iverson, Richard and Krejcik, Patrick and Lutman, Alberto and Maxwell, Timothy and Novokhatski, Alexander and Stupakov, Gennady and Zhang, Zhen and Harrison, Mark and Ruelas, Marcos},
abstractNote = {The RadiaBeam/SLAC dechirper, a structure consisting of pairs of flat, metallic, corrugated plates, has been installed just upstream of the undulators in the Linac Coherent Light Source (LCLS). As a dechirper, with the beam passing between the plates on axis, longitudinal wakefields are induced that can remove unwanted energy chirp in the beam. However, with the beam passing off axis, strong transverse wakes are also induced. This mode of operation has already been used for the production of intense, multicolor photon beams using the fresh-slice technique, and is being used to develop a diagnostic for attosecond bunch length measurements. Here we measure, as a function of offset, the strength of the transverse wakefields that are excited between the two plates, and also for the case of the beam passing near to a single plate. We compare with analytical formulas from the literature, and find good agreement. As a result, this report presents the first systematic measurements of the transverse wake strength in a dechirper, one that has been excited by a bunch with the short pulse duration and high energy found in an x-ray free electron laser.},
doi = {10.1103/PhysRevAccelBeams.20.104403},
journal = {Physical Review Accelerators and Beams},
number = 10,
volume = 20,
place = {United States},
year = {Thu Oct 19 00:00:00 EDT 2017},
month = {Thu Oct 19 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text

Citation Metrics:
Cited by: 12 works
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Figures / Tables:

FIG. 1 FIG. 1: Three corrugations of a horizontal dechirper. A rectangular coordinate system is centered on the symmetry axis of the chamber. The blue ellipse represents an electron beam propagating along the $z$ axis.

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Works referenced in this record:

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journal, August 2016


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


Time-resolved measurement of quadrupole wakefields in corrugated structures
journal, February 2016


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journal, October 2015

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


Works referencing / citing this record:

Generation of coherent two-color pulses at two adjacent harmonics in a seeded free-electron laser
journal, February 2018


Generation of coherent two-color pulses at two adjacent harmonics in a seeded free-electron laser
journal, February 2018


Measurements of electron beam deflection and rf breakdown rate from a surface wave guided in metallic mm-wave accelerating structures
journal, September 2018


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


Dispersion-Based Fresh-Slice Scheme for Free-Electron Lasers
journal, June 2018


Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.