Author: Schlarb, H.
Paper Title Page
MOPB017 Integration of the European XFEL Accelerating Modules 207
  • E. Vogel, S. Barbanotti, J. Branlard, H. Brueck, S. Choroba, L. Hagge, K. Jensch, V.V. Katalev, D. Kostin, D. Käfer, L. Lilje, A. Matheisen, W.-D. Möller, D. Nölle, B. Petersen, J. Prenting, D. Reschke, H. Schlarb, M. Schmökel, J.K. Sekutowicz, W. Singer, H. Weise
    DESY, Hamburg, Germany
  • J. Świerbleski, P.B. Borowiec
    IFJ-PAN, Kraków, Poland
  • S. Berry, O. Napoly, B. Visentin
    CEA/DSM/IRFU, France
  • A. Bosotti, P. Michelato
    INFN/LASA, Segrate (MI), Italy
  • W. Kaabi
    LAL, Orsay, France
  • C. Madec
    CEA/IRFU, Gif-sur-Yvette, France
  • E.P. Plawski
    NCBJ, Świerk/Otwock, Poland
  • F. Toral
    CIEMAT, Madrid, Spain
  The production of the 103 superconducting accelerating modules for the European XFEL is an international effort. Institutes and companies from seven different countries (China, France, Germany, Italy, Poland, Russia and Spain), organized in 12 different work packages contribute with parts, capacity for work and facilities to the production of the modules. Currently the series production of the individual parts started or is approaching. Personnel are trained for the assembly and testing of parts and as well for the complete modules. Here we present an overview and the status of all these activities.  
Synchronization of Accelerator Sub-systems with Ultimate Precision  
  • H. Schlarb
    DESY, Hamburg, Germany
  Precise synchronization of accelerator sub-systems such as LLRF stations, gun or seeding lasers, is a pre-requisite for the successful operation of modern linear accelerators. The synchronization demand is often below 10 fs. Using examples like FLASH at DESY, the European XFEL, or different seeding proposals and studies, a general overview should be given.  
slides icon Slides TU3A01 [3.855 MB]  
THPB085 LLRF Automation for the 9mA ILC Tests at FLASH 1023
  • J. Branlard, V. Ayvazyan, O. Hensler, H. Schlarb, Ch. Schmidt, N.J. Walker, M. Walla
    DESY, Hamburg, Germany
  • G.I. Cancelo, B. Chase
    Fermilab, Batavia, USA
  • J. Carwardine
    ANL, Argonne, USA
  • W. Cichalewski, W. Jałmużna
    TUL-DMCS, Łódź, Poland
  • S. Michizono
    KEK, Ibaraki, Japan
  Since 2009 and under the scope of the International Linear Collider (ILC) R&D, a series of studies takes place twice a year at the Free electron Laser accelerator in Hamburg, (FLASH) DESY, in order to investigate technical challenges related to the high-gradient, high-beam-current design of the ILC. Such issues as operating cavities near their quench limit with high beam loading or in klystron saturation regime are investigated, always pushing the limits of FLASH nominal operational conditions. To support these studies, a series of automation algorithms have been developed and implemented at DESY. These include automatic detection of cavity quenches, automatic adjustment of the superconducting cavity quality factor, and automatic compensation of detuning due to Lorentz forces. This paper explains the functionality of these automation tools, details about their implementation, and shows the experience acquired during the last 9mA ILC test which took place at DESY in February 2012. The benefit of these algorithms and the R&D results these automation tools have permitted will be clearly explained.  
THPB086 Precision Regulation of RF Fields with MIMO Controllers and Cavity-based Notch Filters 1026
  • Ch. Schmidt, J. Branlard, S. Pfeiffer, H. Schlarb
    DESY, Hamburg, Germany
  • W. Jałmużna
    TUL-DMCS, Łódź, Poland
  The European XFEL requires a high precision control of the electron beam, generating a specific pulsed laser light demanded by user experiments. The low level radio frequency (LLRF) control system is certainly one of the key players for the regulation of accelerating RF fields. A uTCA standard LLRF system was developed and is currently under test at DESY. Its first experimental results showed the system performance capabilities. Investigation of regulation limiting factors evidenced the need for control over fundamental cavity modes, which is done using complex controller structures and filter techniques. The improvement in measurement accuracy and detection bandwidth increased the regulation performance and contributed to integration of further control subsystems.