Author: Walla, M.
Paper Title Page
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.