Author: McCombs, K.A.
Paper Title Page
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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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA020  
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