Author: Raubenheimer, T.O.
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MOPOW048 Development of the LCLS-II Optics Design 820
 
  • Y. Nosochkov, P. Emma, T.O. Raubenheimer, M. Woodley
    SLAC, Menlo Park, California, USA
 
  Funding: Work supported by the Department of Energy Contract DE-AC02-76SF00515.
The LCLS-II is a high repetition rate, high average brightness free-electron laser (FEL) under construction at the SLAC National Accelerator Laboratory. The LCLS-II will include new major components: a high repetition-rate injector, a superconducting, CW (continuous wave), 4-GeV linac with a bunch compressor system, a 3-way beam spreader, with independent hard X-ray (HXR) and soft X-ray (SXR) FEL undulators. The design is based on the existing SLAC facilities, including the LCLS linac and beam transport lines. The new SXR line will utilize a variable-gap undulator sharing the same tunnel with the new HXR horizontal-gap vertically polarizing undulator that will replace the existing LCLS undulator. We describe the current state of the electron optics design and the latest developments.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW048  
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TUPOR018 Design Optimization of Compensation Chicanes in the LCLS-II Transport Lines 1695
 
  • J. Qiang, C.E. Mitchell, M. Venturini
    LBNL, Berkeley, California, USA
  • Y. Ding, P. Emma, Z. Huang, G. Marcus, Y. Nosochkov, T.O. Raubenheimer, L. Wang, M. Woodley
    SLAC, Menlo Park, California, USA
 
  LCLS-II is a 4th-generation high-repetition rate Free Electron Laser (FEL) based x-ray light source to be built at the SLAC National Accelerator Laboratory. To mitigate the microbunching instability, the transport lines from the exit of the Linac to the undulators will include a number of weak compensation chicanes with the purpose of cancelling the momentum compaction generated by the main bend magnets of the transport lines. In this paper, we will report on our design optimization study of these compensation chicanes in the presence of both longitudinal and transverse space-charge effects.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR018  
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TUPOR019 RF Injector Beam Dynamics Optimization and Injected Beam Energy Constraints for LCLS-II 1699
 
  • C.E. Mitchell, H.J. Qian, J. Qiang, F. Sannibale, M. Venturini
    LBNL, Berkeley, California, USA
  • P. Emma, T.O. Raubenheimer, J.F. Schmerge, F. Zhou
    SLAC, Menlo Park, California, USA
 
  Funding: Work supported by the Office of Science of the US Department of Energy under Contract no. DEAC02-05CH11231.
LCLS-II is a proposed high-repetition rate (>1 MHz) Free Electron Laser (FEL) X-ray light source, based on a CW, superconducting linac, to be built at SLAC National Accelerator Laboratory. The injector technology is based on a high-repetition rate RF photoinjector gun developed as part of the Advanced Photoinjector Experiment (APEX) at Lawrence Berkeley National Laboratory. Exploration of the injector design settings is performed using a multiobjective genetic optimizer to optimize the beam quality at the injector exit (~100 MeV). In this paper, we describe the current status of LCLS-II injector design optimization, with a focus on the sensitivity of the optimized solutions to the beam energy at the injector exit, which is constrained by the requirements of the downstream laser heater system.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR019  
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WEPMR012 Misalignment Studies of LCLS-II SC Linac 2283
 
  • A. Saini, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
 
  The Linac Coherent Light Source (LCLS) is an x-ray free electron laser facility. The proposed upgrade of the LCLS facility is based on construction of a 4 GeV superconducting (SC) linear accelerator (linac). An optimal reliable performance of the linac is largely determined by beam sensitivity to various component alignment errors. In this paper we evaluate misalignment tolerances of LCLSII SC linac using a more realistic alignment model that includes correlated misalignment of elements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR012  
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WEPOR031 Field Emission Radiation Characterization of LCLS-II Cavities 2736
 
  • M. Santana-Leitner, C. Adolphsen, L. Ge, Z. Li, T.O. Raubenheimer, M.C. Ross
    SLAC, Menlo Park, California, USA
  • S. Aderhold, A. Grassellino, O.S. Melnychuk, R.V. Pilipenko, D.A. Sergatskov
    Fermilab, Batavia, Illinois, USA
 
  Funding: Work supported by U.S. Department of Energy contract DE-AC02-76SF00515
LCLS-II XFEL facility at the SLAC National Accelerator Laboratory will accelerate CW beams of up to 300 uA to 4 GeV using superconducting radio frequency cavities. Before installation, fully assembled cryomodules will be tested at Fermilab and Jefferson Lab. Besides the basic measurements of cavity gradients and cryogenic heat loads, radiation and dark current levels will be recorded. The latter parameters need to be limited to ensure the safety of the machine and the lifetime of radio-sensitive components installed near the cavities. In this paper we describe the simulation studies being done in preparation of tests, where expected radiation measurements in the different detectors are correlated with field emission and with dark currents in Faraday cups at each end of the cryomodule. This work includes simulations using a detailed model of the cryomodules and detectors, where field emission data generated with Track3P is parsed to the FLUKA radiation transport code.

 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR031  
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FRXBB01 Achieved Performance of an All X-band Photo-injector 4253
 
  • C. Limborg, C. Adolphsen, M.P. Dunning, R.K. Jobe, H. Li, D.J. McCormick, T.O. Raubenheimer, T. Vecchione, A.R. Vrielink, F.Y. Wang, S.P. Weathersby
    SLAC, Menlo Park, California, USA
 
  Funding: Work funded by DOE/SU Contract DE-AC02-76-SF00515
Building more compact accelerators to deliver high brightness electron beams for the generation of high flux, highly coherent radiation is a priority for the photon science community. A relatively straightforward reduction in footprint can be achieved by using high-gradient X-Band (11.4 GHz) RF technology. This talk presents the all X-band photo-injector facility at SLAC, covering the benefits of using this technology and highlighting the performance achieved.
 
slides icon Slides FRXBB01 [40.418 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-FRXBB01  
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