Author: Hensler, O.
Paper Title Page
MOA3O02 The Large Scale European XFEL Control System: Overview and Status of the Commissioning 1
  • R. Bacher, A. Aghababyan, P.K. Bartkiewicz, T. Boeckmann, B. Bruns, M.R. Clausen, T. Delfs, P. Duval, L. Fröhlich, W. Gerhardt, C. Gindler, J. Hatje, O. Hensler, J.M. Jäger, R. Kammering, S. Karstensen, H. Keller, V. Kocharyan, O. Korth, A. Labudda, T. Limberg, S.M. Meykopff, M. Möller, J. Penning, A. Petrosyan, G. Petrosyan, L.P. Petrosyan, V. Petrosyan, P. Pototzki, K.R. Rehlich, S. Rettig-Labusga, H.R. Rickens, G. Schlesselmann, B. Schoeneburg, E. Sombrowski, M. Staack, C. Stechmann, J. Szczesny, J. Wilgen, T. Wilksen, H. Wu
    DESY, Hamburg, Germany
  • S. Abeghyan, A. Beckmann, D. Boukhelef, N. Coppola, S.G. Esenov, B. Fernandes, P. Gessler, G. Giambartolomei, S. Hauf, B.C. Heisen, S. Karabekyan, M. Kumar, L.G. Maia, A. Parenti, A. Silenzi, H. Sotoudi Namin, J. Szuba, M. Teichmann, J. Tolkiehn, K. Weger, J. Wiggins, K. Wrona, M. Yakopov, C. Youngman
    XFEL. EU, Hamburg, Germany
  The European XFEL is a 3.4km long X-ray Free Electron Laser in the final construction and commissioning phase in Hamburg. It will produce 27000 bunches per second at 17.5GeV. Early 2015 a first electron beam was produced in the RF-photo-injector and the commissioning of consecutive sections is following during this and next year. The huge number and variety of devices for the accelerator, beam line, experiment, cryogenic and facility systems pose a challenging control task. Multiple systems, including industrial solutions, must be interfaced to each other. The high number of bunches requires a tight time synchronization (down to picoseconds) and high performance data acquisition systems. Fast feedbacks from front-ends, the DAQs and online analysis system with a seamless integration of controls are essential for the accelerator and the initially 6 experimental end stations. It turns out that the European XFEL will be the first installation exceeding 2500 FPGA components in the MicroTCA form factor and will run one of the largest PROFIBUS networks. Many subsystem prototypes are already successfully in operation. An overview and status of the XFEL control system will be given.  
slides icon Slides MOA3O02 [3.101 MB]  
MOC3O07 Low Level RF Control Implementation and Simultaneous Operation of Two FEL Undulator Beamlines at FLASH 1
  • V. Ayvazyan, S. Ackermann, J. Branlard, B. Faatz, M.K. Grecki, O. Hensler, S. Pfeiffer, H. Schlarb, Ch. Schmidt, M. Scholz, S. Schreiber
    DESY, Hamburg, Germany
  • A. Piotrowski
    FastLogic Sp. z o.o., Łódź, Poland
  The Free-Electron Laser in Hamburg (FLASH) is a user facility delivering femtosecond short radiation pulses in the wavelength range between 4.2 and 45 nm using the SASE principle. The tests performed in the last few years have shown that two FLASH undulator beamlines can deliver FEL radiation simultaneously to users with a large variety of parameters such as radiation wavelength, pulse duration, intra-bunch spacing etc. FLASH has two injector lasers on the cathode of the gun to deliver different bunch trains with different charges, needed for different bunch lengths. Because the compression settings depend on the charge of bunches the low level RF system needs to be able to supply different compression for both beamlines. The functionality of the controller has been extended to provide intra-pulse amplitude and phase changes while maintaining the RF field amplitude and the phase stability requirements. The RF parameter adjustment and tuning for RF gun and accelerating modules can be done independently for both laser systems. Having different amplitudes and phases within the RF pulse in several RF stations simultaneous lasing of both systems has been demonstrated.  
slides icon Slides MOC3O07 [4.640 MB]  
MOPGF101 High Level Controls for the European XFEL 1
  • L. Fröhlich, B. Beutner, W. Decking, O. Hensler, R. Kammering, T. Limberg, S.M. Meykopff, J. Wilgen
    DESY, Hamburg, Germany
  The European X-Ray Free-Electron Laser (XFEL) will generate extremely short and intense X-ray flashes from the electron beam of a 2.1 km long superconducting linear accelerator. Due to the complexity of the facility and the sheer number of subsystems and components, special emphasis needs to be placed on the automatization of procedures, on the abstraction of machine parameters, and on the development of user-friendly high-level software for the operation of the accelerator. This paper gives an overview of the ongoing work and highlights several new tools and concepts.  
TUD3O04 The Virtual European XFEL Accelerator 1
  • R. Kammering, W. Decking, L. Fröhlich, O. Hensler, T. Limberg, S.M. Meykopff, K.R. Rehlich, V. Rybnikov, J. Wilgen, T. Wilksen
    DESY, Hamburg, Germany
  The ambitious commissioning plans for the European XFEL require that many of the high-level controls are ready from the beginning. The idea arose to create a virtual environment to carry out such developments and tests in advance, to test interfaces, software in general and the visualisation of the variety of components. Based on the experiences and on the systems that are already in operation at the FLASH facility for several years, such a virtual environment is being created. The system can already simulate most of the key components of the upcoming accelerator. Core of the system is an event synchronized data acquisition system (DAQ). The interfaces of the DAQ system towards the device level, as well as to the high-level side is utilising the same software stack as the production system does. Thus, the software can be developed and used interchangeably between the virtual and the real machine. This allows to test concepts, interfaces and identify problems and errors at an early stage. In this paper the opportunities arising from the operation of such a virtual machine will be presented. The limits in terms of the resulting complexity and physical relationships will also be shown.  
slides icon Slides TUD3O04 [3.225 MB]  
WEPGF029 High Level Software Structure for the European XFEL LLRF System 1
  • Ch. Schmidt, V. Ayvazyan, J. Branlard, Ł. Butkowski, O. Hensler, M. Killenberg, M. Omet, S. Pfeiffer, K.P. Przygoda, H. Schlarb
    DESY, Hamburg, Germany
  • W. Cichalewski, F. Makowski
    TUL-DMCS, Łódź, Poland
  • A. Piotrowski
    FastLogic Sp. z o.o., Łódź, Poland
  The Low level RF system for the European XFEL is controlling the accelerating RF fields in order to meet the specifications of the electron bunch parameters. A hardware platform based on the MicroTCA.4 standard has been chosen, to realize a reliable, remotely maintainable and high performing integrated system. Fast data transfer and processing is done by field programmable gate arrays (FPGA) within the crate, controlled by a CPU via PCIe communication. In addition to the MTCA system, the LLRF comprises external supporting modules also requiring control and monitoring software. In this paper the LLRF system high level software used in E-XFEL is presented. It is implemented as a semi-distributed architecture of front end server instances in combination with direct FPGA communication using fast optical links. Miscellaneous server tasks have to be executed, e.g. fast data acquisition and distribution, adaptation algorithms and updating controller parameters. Furthermore the inter-server data communication and integration within the control system environment as well as the interface to other subsystems are described.