Author: Woodley, M.D.
Paper Title Page
WEPAB251 Beam Dynamics Optimization of LCLS-II HE Linear Accelerator Design 3224
 
  • J. Qiang
    LBNL, Berkeley, California, USA
  • T.O. Raubenheimer, M.D. Woodley
    SLAC, Menlo Park, California, USA
  
  The LCLS-II-HE as a high energy upgrade of the high repetition rate X-ray FEL under construction at SLAC will provide great opportunities for scientific discovery by generating coherent, high brightness hard X-ray radiation. In this paper, we report on beam dynamics optimization of the LCLS-II HE linear accelerator design with a 100pC and a 20pC charge beam to attain high quality electron beam for X-ray FEL radiation. We also present preliminary results of beam dynamics optimization of a 100pC beam from a low emittance superconducting injector.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB251  
About • paper received ※ 18 May 2021       paper accepted ※ 21 June 2021       issue date ※ 30 August 2021  
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THPAB220 Multibunch Studies for LCLS-II High Energy Upgrade 4219
 
  • R.J. England, K.L.F. Bane, Z. Li, T.O. Raubenheimer, M.D. Woodley
    SLAC, Menlo Park, California, USA
  • M. Borland
    ANL, Lemont, Illinois, USA
  • A. Lunin
    Fermilab, Batavia, Illinois, USA
  
  Funding: The work is supported in part by DOE Contract No. DE-AC02-76SF00515.
The Linac Coherent Light Source (LCLS) X-ray free-electron laser at SLAC is being upgraded to LCLS-II with a superconducting linac and 1 MHz bunch repetition rate. The proposed high-energy upgrade (LCLS-II-HE) will increase the beam energy from 4 to 8 GeV, extending the reach of accessible X-ray photon energies. With the increased repetition rate and longer linac of LCLS-II-HE, multi-bunch effects are of greater concern. We use recently introduced capabilities in the beam transport code ELEGANT to study dipole and monopole beam breakup effects for LCLS-II HE beam parameters. The results indicate that resonant dipole kicks have steady-state settle times on the order of 500 bunches or less and appear manageable. We also consider a statistical variation of the cavity frequencies and transverse offsets of cavities and quadrupoles. Resonant emittance growth driven by monopole kicks is found to be disrupted by frequency variation between cavities. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB220  
About • paper received ※ 19 May 2021       paper accepted ※ 15 July 2021       issue date ※ 21 August 2021  
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