Keyword: undulator
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MOPMU012 The Local Control System of an Undulator Cell for the European XFEL controls, quadrupole, electron, photon 450
  • S. Karabekyan, R. Pannier, J. Pflüger
    European XFEL GmbH, Hamburg, Germany
  • N. Burandt, J. Kuhn
    Beckhoff Automation GmbH, Verl, Germany
  • A. Schöps
    DESY, Hamburg, Germany
  The European XFEL project is a 4th generation light source. The first beam will be delivered in the beginning of 2015. At the project startup three light sources SASE 1, SASE 2 and SASE 3 will produce spatially coherent ≤80fs short photon pulses with a peak brilliance of 1032-1034 photons/s/mm2/mrad2/0.1% BW in the energy range from 0.26 to 24 keV at an electron beam energy 14 GeV. The Undulator systems are used to produce photon beams for SASE 1, SASE 2 and SASE 3. Each undulator system consists of an array of undulator cells installed in a row along the electron beam. The undulator cell itself consists of a planar undulator, a phase shifter, magnetic field correction coils and a quadrupole mover. The local control system of the undulator cell is based on industrial components produced by Beckhoff and on PLC software implemented in TwinCAT system. Four servo motors are installed on each undulator and control the gap between girders with micrometer accuracy. One stepper motor is used for phase shifter control, and two other stepper motors control the position of the quadrupole magnet. The current of magnetic field correction coils as well as the gap of the phase shifter are adjustable as a function of the undulator gap. The high level of synchronization (<<1μs) for the complete undulator system (for instance SASE2 with 35 undulator cells in total) could be achieved due to implementation of the EtherCAT fieldbus system in the local control. The description of the hardware components and the software functionality of the local control system will be discussed.  
poster icon Poster MOPMU012 [1.163 MB]  
WEMMU004 SPI Boards Package, a New Set of Electronic Boards at Synchrotron SOLEIL controls, FPGA, detector, interface 687
  • Y.-M. Abiven, P. Betinelli-Deck, J. Bisou, F. Blache, F. Briquez, A. Chattou, J. Coquet, P. Gourhant, N. Leclercq, P. Monteiro, G. Renaud, J.P. Ricaud, L. Roussier
    SOLEIL, Gif-sur-Yvette, France
  SOLEIL is a third generation Synchrotron radiation source located in France near Paris. At the moment, the Storage Ring delivers photon beam to 23 beamlines. Since machine and beamlines improve their performance, new requirements are identified. On the machine side, new implementation for feedforward of electromagnetic undulators is required to improve beam stability. On the beamlines side, a solution is required to synchronize data acquisition with motor position during continuous scan. In order to provide a simple and modular solution for these applications requiring synchronization, the electronic group developed a set of electronic boards called "SPI board package". In this package, the boards can be connected together in daisy chain and communicate to the controller through a SPI* Bus. Communication with control system is done via Ethernet. At the moment the following boards are developed: a controller board based on a Cortex M3 MCU, 16bits ADC board, 16bits DAC board and a board allowing to process motor encoder signals based on a FPGA Spartan III. This platform allows us to embed process close to the hardware with open tools. Thanks to this solution we reach the best performances of synchronization.
* SPI: Serial Peripheral Interface
slides icon Slides WEMMU004 [0.230 MB]  
poster icon Poster WEMMU004 [0.430 MB]  
WEPKN010 European XFEL Phase Shifter: PC-based Control System controls, LabView, hardware, GUI 731
  • E. Molina Marinas, J.M. Cela-Ruiz, A. Guirao, L.M. Martinez Fresno, I. Moya, A.L. Pardillo, S. Sanz, C. Vazquez, J.G.S. de la Gama
    CIEMAT, Madrid, Spain
  Funding: Work partially supported by the Spanish Ministry of Science and Innovation under SEI Resolution on 17-September-2009
The Accelerator Technology Unit at CIEMAT is in charge of part of the Spanish contribution to the European X-Ray Free-Electron Laser (EXFEL). This paper presents the control system of the Phase Shifter (PS), a beam phase corrector magnet that will be installed in the intersections of the SASE undulator system. Beckhoff has been chosen by EXFEL as its main supplier for the industrial control systems. Beckhoff Twincat PLC architecture is a PC-based control technology built over EtherCAT, a real-time Ethernet fieldbus. The PS is operated with a stepper motor, its position is monitored by an incremental encoder, and it is controlled by a Twincat-PLC program using the TcMC2 library, an implementation of the PLCopen Motion Control specification. A GUI has been developed in LabVIEW instead of using Beckhoff visualization tool. The control system for the first and second prototype devices has been developed in-house using COTS hardware and software. The specifications request a repeatability of ±50μm in bidirectional movements and ±10μm in unidirectional movements. The second prototype can reach speeds up to 15 mm/s.
poster icon Poster WEPKN010 [3.077 MB]