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Title: Beam debunching due to ISR-induced energy diffusion

One of the options for increasing longitudinal coherency of X-ray free electron lasers (XFELs) is seeding with a microbunched electron beam. Several schemes leading to significant amplitude of the beam bunching at X-ray wavelengths were recently proposed. All these schemes rely on beam optics having several magnetic dipoles. While the beam passes through a dipole, its energy spread increases due to quantum effects of synchrotron radiation. As a result, the bunching factor at small wavelengths reduces since electrons having different energies follow different trajectories in the bend. We rigorously calculate the reduction in the bunching factor due to incoherent synchrotron the radiation while the beam travels in an arbitrary beamline. Lastly, we apply general results to estimate reduction of harmonic current in common schemes proposed for XFEL seeding.
Authors:
ORCiD logo [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-12-23278
Journal ID: ISSN 0168-9002; TRN: US1702539
Grant/Contract Number:
AC52-06NA25396
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: 870; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Accelerator Design, Technology, and Operations
OSTI Identifier:
1371667

Yampolsky, Nikolai A., and Carlsten, Bruce E.. Beam debunching due to ISR-induced energy diffusion. United States: N. p., Web. doi:10.1016/j.nima.2017.06.023.
Yampolsky, Nikolai A., & Carlsten, Bruce E.. Beam debunching due to ISR-induced energy diffusion. United States. doi:10.1016/j.nima.2017.06.023.
Yampolsky, Nikolai A., and Carlsten, Bruce E.. 2017. "Beam debunching due to ISR-induced energy diffusion". United States. doi:10.1016/j.nima.2017.06.023. https://www.osti.gov/servlets/purl/1371667.
@article{osti_1371667,
title = {Beam debunching due to ISR-induced energy diffusion},
author = {Yampolsky, Nikolai A. and Carlsten, Bruce E.},
abstractNote = {One of the options for increasing longitudinal coherency of X-ray free electron lasers (XFELs) is seeding with a microbunched electron beam. Several schemes leading to significant amplitude of the beam bunching at X-ray wavelengths were recently proposed. All these schemes rely on beam optics having several magnetic dipoles. While the beam passes through a dipole, its energy spread increases due to quantum effects of synchrotron radiation. As a result, the bunching factor at small wavelengths reduces since electrons having different energies follow different trajectories in the bend. We rigorously calculate the reduction in the bunching factor due to incoherent synchrotron the radiation while the beam travels in an arbitrary beamline. Lastly, we apply general results to estimate reduction of harmonic current in common schemes proposed for XFEL seeding.},
doi = {10.1016/j.nima.2017.06.023},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 870,
place = {United States},
year = {2017},
month = {6}
}