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

Journal Article · · Physical Review Accelerators and Beams
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Tsinghua Univ., Beijing (China)
  4. RadiaBeam Systems, Santa Monica, CA (United States)
+ Show Author Affiliations

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; SC0009550
OSTI ID:
1400341
Alternate ID(s):
OSTI ID: 1417670
Journal Information:
Physical Review Accelerators and Beams, Vol. 20, Issue 10; ISSN 2469-9888
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (16)

Analytical formulas for short bunch wakes in a flat dechirper 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
Fresh-slice multicolour X-ray free-electron lasers journal October 2016
Femtosecond x-ray pulse temporal characterization in free-electron lasers using a transverse deflector journal December 2011
First lasing and operation of an ångstrom-wavelength free-electron laser journal August 2010
Frequency chirped self-amplified spontaneous-emission free-electron lasers journal May 2003
Wakefield potentials of corrugated structures journal October 2015
Temporal profile measurements of relativistic electron bunch based on wakefield generation journal February 2016
Calculation of wakefields in 2D rectangular structures journal October 2015
Self-amplified spontaneous emission FEL with energy-chirped electron beam and its application for generation of attosecond x-ray pulses journal May 2006
Corrugated pipe as a beam dechirper
  • Bane, K. L. F.; Stupakov, G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 690 https://doi.org/10.1016/j.nima.2012.07.001
journal October 2012
Experimental Demonstration of Energy-Chirp Control in Relativistic Electron Bunches Using a Corrugated Pipe journal January 2014
Time-Resolved Measurement of Quadrupole Wakefields in Corrugated Structures text January 2017
Analytical Formulas for Short Bunch Wakes in a Flat Dechirper text January 2016
SASE FEL with energy-chirped electron beam and its application for generation of attosecond pulses text January 2006

Cited By (3)

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
Use of a corrugated beam pipe as a passive deflector for bunch length measurements journal February 2018

Figures / Tables (7)

FIG. 1(p. 3)figure FIG. 1
TABLE I(p. 3)table TABLE I
FIG. 2(p. 4)figure FIG. 2
FIG. 3(p. 4)figure FIG. 3
FIG. 4(p. 5)figure FIG. 4
FIG. 5(p. 6)figure FIG. 5
FIG. 6(p. 6)figure FIG. 6

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