Author: Einstein, J.
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MOPMW037 FEL Simulation Using Distributed Computing 483
  • J. Einstein, S. Biedron, H. Freund, S.V. Milton, P.J.M. van der Slot
    CSU, Fort Collins, Colorado, USA
  • G. Bernabeu Altayo
    Fermi National Accelerator Laboratory, Batavia, Illinois, USA
  • S. Biedron
    University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia
  • J. Einstein
    Fermilab, Batavia, Illinois, USA
  • P.J.M. van der Slot
    Twente University, Laser Physics and Non-Linear Optics Group, Enschede, The Netherlands
  While simulation tools are available and have been used regularly for simulating light sources, the increasing availability and lower cost of GPU-based processing opens up new opportunities. This poster highlights a method of how accelerating and parallelizing code processing through the use of COTS software interfaces.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW037  
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WEPOR042 LLRF Control of High Loaded-Q Cavities for the LCLS-II 2765
  • C. Serrano, L.R. Doolittle, G. Huang, A. Ratti
    LBNL, Berkeley, California, USA
  • S. Babel, M. Boyes, B. Hong
    SLAC, Menlo Park, California, USA
  • R. Bachimanchi, C. Hovater
    JLab, Newport News, Virginia, USA
  • B.E. Chase, E. Cullerton, J. Einstein
    Fermilab, Batavia, Illinois, USA
  Funding: This work was supported by the LCLS-II Project and the U.S. Department of Energy, Contract DE-AC02-76SF00515
The SLAC National Accelerator Laboratory is planning an upgrade (LCLS-II) to the Linear Coherent Light Source with a 4 GeV CW Superconducting Radio Frequency (SCRF) linac. The nature of the machine places stringent requirements in the Low-Level RF (LLRF) system, expected to control the cavity fields within 0.01 degrees in phase and 0.01% in amplitude, which is equivalent to a longitudinal motion of the cavity structure in the nanometer range. This stability has been achieved in the past but never for hundreds of superconducting cavities in Continuous-Wave (CW) operation. The difficulty resides in providing the ability to reject disturbances from the cryomodule, which is incompletely known as it depends on the cryomodule structure itself (currently under development at JLab and Fermilab) and the harsh accelerator environment. Previous experience in the field and an extrapolation to the cavity design parameters (relatively high QLc≈ 4×107 , implying a half-bandwidth of around 16 Hz) suggest the use of strong RF feedback to reject the projected noise disturbances, which in turn demands careful engineering of the entire system.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR042  
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