Author: Alarcon, A.D.
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MOAPL04 SwissFEL Control System - Overview, Status, and Lessons Learned 19
  • E. Zimoch, A.D. Alarcon, D. Anicic, A.G. Bertrand, R. Biffiger, K. Bitterli, M. Boccioli, H. Brands, P. Bucher, T. Celcer, P. Chevtsov, E.J. Divall, S.G. Ebner, M. Gasche, F. Haemmerli, C.E. Higgs, T. Humar, M. Janousch, G. Janser, G. Jud, B. Kalantari, R. Kapeller, R.A. Krempaská, D.J. Lauk, M.P. Laznovsky, H. Lutz, D. Maier-Manojlovic, F. Märki, V. Ovinnikov, T. Pal, W. Portmann, S.G. Rees, T. Zamofing, C. Zellweger, D. Zimoch
    PSI, Villigen PSI, Switzerland
  The SwissFEL is a new free electron laser facility at the Paul Scherrer Institute (PSI) in Switzerland. Commissioning started in 2016 and resulted in first lasing in December 2016 (albeit not on the design energy). In 2017, the commissioning continued and will result in the first pilot experiments at the end of the year. The close interaction of experiment and accelerator components as well as the pulsed electron beam required a well thought out integration of the control system including some new concepts and layouts. This paper presents the current status of the control system together with some lessons learned.  
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THPHA020 LCLS-II Undulator Motion Control 1379
  • K.R. Lauer, A.D. Alarcon, C.J. Andrews, S. Babel, J.D. Bong, M. Boyes, J.M. D'Ewart, Yu.I. Levashov, D.S. Martinez-Galarce, B.D. McKee, H.-D. Nuhn, M. Petree, M. Rowen, Z.R. Wolf
    SLAC, Menlo Park, California, USA
  • D. Arbelaez, D. Bianculli, A.P. Brown, J.N. Corlett, A.J. DeMello, L. Garcia Fajardo, J.-Y. Jung, M. Leitner, S. Marks, K.A. McCombs, D.V. Munson, K.L. Ray, D.A. Sadlier, E.J. Wallén
    LBNL, Berkeley, California, USA
  • G. Janša, Ž. Oven
    Cosylab, Ljubljana, Slovenia
  • M. Merritt, M.L. Smith, R.J. Voogd, J.Z. Xu
    ANL, Argonne, Illinois, USA
  Funding: Department of Energy contract DE-AC02-76SF00515.
At the heart of the LCLS-II are two undulator lines: the hard x-ray (HXR) line and the soft x-ray line (SXR). The SXR line is comprised of 21 variable gap undulator segments separated by an interspace stands with a cam positioning system capable of positioning in 5 degrees of freedom (DOF). The undulator segment motion control utilizes the Aerotech Ensemble motion controller through an EPICS Soft IOC (input-output controller). Its drive system consists of a Harmonic Drive servo system with feedback from two absolute full-gap encoders. Additional Aerotech motion controllers are used to control the cam-positioning system and phase shifters of the interspace stand. The HXR line is comprised of 32 undulator segments each including an integrated interspace assembly. The segment girder is placed on two stands with a similar cam-positioning system as in the SXR line allowing for movement in 5 DOF. As one of the design goals of the HXR line was to reuse the original LCLS girder positioning system, the motion control system is an upgraded version of that original system, using RTEMS on VME with Animatics SmartMotors.
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