Author: Thorin, S.
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MOPOPA12 Preserving Bright Electron Beams: Distorted CSR Kicks 91
SUPCRI08   use link to see paper's listing under its alternate paper code  
  • A. Dixon, T.K. Charles
    The University of Liverpool, Liverpool, United Kingdom
  • T.K. Charles, P.H. Williams
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
  • P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  Short pulse, low emittance electron beams are necessary to drive bright FEL X-rays, for this reason it is important to preserve and limit emittance growth. The strong bunch compression required to achieve the short bunches, can lead to coherent synchrotron radiation (CSR)-induced emittance growth, and while there are some methods of CSR cancel- lation, these methods may be less effective when the CSR kicks are distorted. In an attempt to understand why CSR kicks become distorted, we compare the CSR kicks calcu- lated using the whole beam parameters to the CSR kicks calculated using the longitudinally sliced beam parameters, when propagated to the end of the bunch compressor. We find that CSR kicks can become distorted when calculated with non-uniform slice beam parameters. While slice beam parameters that are uniform along the centre of the bunch, do not result in distorted CSR kicks.  
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About • Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 31 August 2022
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TUPORI12 Beam Dynamics for the MAX IV Transverse Deflecting Cavity Beamline 565
  • N. Blaskovic Kraljevic, L. Isaksson, E. Mansten, S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
  The MAX IV 3 GeV linac delivers electron beams to two synchrotron rings and to a dedicated undulator system for X-ray beam delivery in the Short Pulse Facility (SPF). In addition, there are plans to use the linac as an injector for a future Soft X-ray Laser (SXL). For both SPF and SXL operations, longitudinal beam characterisation with a high temporal resolution is essential. For this purpose, a transverse deflecting cavity (TDC) system has been developed and is being installed in a dedicated electron beamline branch located downstream of the 3 GeV linac. This beamline consists of two consecutive 3 m long transverse S-band RF structures, followed by a variable vertical deflector dipole magnet used as an energy spectrometer. This conference contribution presents the beam dynamics calculations for the beam transport along the TDC beamline, and in particular the optics configurations for slice emittance and slice energy spread measurements. The operation of an analysis algorithm for use in the control room is discussed. The aim is to provide 1 fs temporal measurement resolution to access the bunch duration of highly compressed bunches and slice parameters for sub-10-fs bunches.  
DOI • reference for this paper ※  
About • Received ※ 24 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022
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