Keyword: undulator
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TUPHA148 Next Generation Control System Using the EtherCAT Technology ion, controls, LLRF, power-supply 751
  • M. Ishii, Y. Ishizawa, M.T. Takeuchi
    JASRI/SPring-8, Hyogo-ken, Japan
  • T. Fukui
    RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
  Toward the SPring-8 upgrade, which we call SPring-8-II, new innovative technologies are introduced at a control framework, a platform, and a fieldbus. We adopted EtherCAT having a master/slave topology as a network based fieldbus. Since a cyclic data transfer time is less than 1msec, EtherCAT can be provided enough performance for a fast control and a feedback system. Synchronization between slaves can be realized easily by the distributed clock technology. Controllers and sensors are set near equipment, and input and output data to/from a master via an Ethernet cable. It reduces the number of wires and the working time for wiring. In 2016, we installed EtherCAT into three types of equipment control systems. One was a prototype digital LLRF system in the high power rf test stand at SPring-8. Another was sub-encoder readout for an undulator at SPring-8. The other was a control system for a kicker magnet power supply at SACLA. An XMC typed EtherCAT Master module was implemented into each of these systems and connected to multi vendor slaves. In this paper, we report the status of new control system using the EtherCAT technology and future plan.  
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THPHA003 Installation and the Hardware Commissioning of the European XFEL Undulator Systems ion, controls, vacuum, quadrupole 1344
  • M. Yakopov, S. Abeghyan, S. Karabekyan, J. Pflüger
    XFEL. EU, Schenefeld, Germany
  This article describes in detail the steps of hardware installation and commissioning of components for undulator systems at European XFEL. In general, the work can be divided into 3 different steps: installation, alignment, and commissioning. During installation step, the following main components were rolled into the tunnel: - undulators with the control cabinets, intersection control cabinets, phase shifters, quadrupole movers, correction coils. They have been mounted according to the designed positions. Then all mentioned components have been aligned according to the specifications. Finally, the cabling has been done and basic tests were performed. As part of the commissioning, the calibration of the temperature sensors, as well as the measurements of the quadrupole mover travel distance has been done in the tunnel. Afterwards, the undulator limit switches and hard stops were adjusted to secure the vacuum chamber by closing the undulator gap up to 10mm. Eventually, the system was handed over to the global control system in order to perform all functional tests. The main focus is given to the components which are controlled or monitored by the undulator local control system [1].  
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THPHA020 LCLS-II Undulator Motion Control ion, controls, EPICS, hardware 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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THPHA120 Compensation Controls for an Elliptically Polarising Undulator ion, controls, software, quadrupole 1658
  • J. Willard, T. Wilson, W.A. Wurtz
    CLS, Saskatoon, Saskatchewan, Canada
  Funding: NRC, WD, NSERC, CIHR, University of Saskatchewan, Government of Saskatchewan, and CFI
At the Canadian Light Source (CLS) synchrotron, the addition of the Quantum Materials Spectroscopy Centre (QMSC) beamline requires the addition of an Elliptically Polarizing Undulator (EPU) insertion device to produce photons from the stored electron beam. Unlike the majority of such insertion devices, this EPU is capable of producing photons of simultaneous arbitrary elliptical and linear phases, in addition to a range of energies. This EPU is also capable of creating perturbations of the stored electron beam sufficient to cause an interruption of an injection. In order to prevent this, compensation controls have been developed. These controls are accomplished with a combination of Experimental Physics and Industrial Control System (EPICS), mathematical models, and algorithms written in C and MATLAB.
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