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TY - CONF AU - Lauer, K.R. AU - Alarcon, A.D. AU - Andrews, C.J. AU - Arbelaez, D. AU - Babel, S. AU - Bianculli, D. AU - Bong, J.D. AU - Boyes, M. AU - Brown, A.P. AU - Corlett, J.N. AU - D'Ewart, J.M. AU - DeMello, A.J. AU - Garcia Fajardo, L. AU - Janša, G. AU - Jung, J.-Y. AU - Leitner, M. AU - Levashov, Yu.I. AU - Marks, S. AU - Martinez-Galarce, D.S. AU - McCombs, K.A. AU - McKee, B.D. AU - Merritt, M. AU - Munson, D.V. AU - Nuhn, H.-D. AU - Oven, Ž. AU - Petree, M. AU - Ray, K.L. AU - Rowen, M. AU - Sadlier, D.A. AU - Smith, M.L. AU - Voogd, R.J. AU - WallÃ©n, E.J. AU - Wolf, Z.R. AU - Xu, J.Z. ED - Schaa, Volker RW TI - LCLS-II Undulator Motion Control J2 - Proc. of ICALEPCS2017, Barcelona, Spain, 8-13 October 2017 C1 - Barcelona, Spain T2 - International Conference on Accelerator and Large Experimental Control Systems T3 - 16 LA - english AB - 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. PB - JACoW CP - Geneva, Switzerland SP - 1379 EP - 1383 KW - ion KW - controls KW - undulator KW - EPICS KW - hardware DA - 2018/01 PY - 2018 SN - 978-3-95450-193-9 DO - 10.18429/JACoW-ICALEPCS2017-THPHA020 UR - http://jacow.org/icalepcs2017/papers/thpha020.pdf ER -