Author: Heuer, M.
Paper Title Page
WEPC32 Past, Present and Future Aspects of Laser-Based Synchronization at FLASH 753
 
  • S. Schulz, M. Bousonville, M.K. Czwalinna, M. Felber, M. Heuer, T. Lamb, J. Müller, P. Peier, S. Ruzin, H. Schlarb, B. Steffen, C. Sydlo, F. Zummack
    DESY, Hamburg, Germany
  • T. Kozak, P. Predki
    TUL-DMCS, Łódź, Poland
  • A. Kuhl
    Uni HH, Hamburg, Germany
  
  Free-elec­tron lasers, like FLASH and the up­com­ing Eu­ro­pean XFEL, are ca­pa­ble of pro­duc­ing XUV and X-ray pulses of a few fem­tosec­onds du­ra­tion. For time-re­solved pump-probe ex­per­i­ments and the ex­ter­nally seeded op­er­a­tion mode it is cru­cial not only to sta­bi­lize the ar­rival time of the elec­tron bunches, but also to achieve a syn­chro­niza­tion ac­cu­racy of ex­ter­nal lasers on the same timescale. This can only be re­al­ized with a laser-based syn­chro­niza­tion in­fra­struc­ture. At FLASH, a pe­ri­odic fem­tosec­ond laser pulse train is trans­mit­ted over ac­tively sta­bi­lized op­ti­cal fibers to the crit­i­cal sub­sys­tems. In this paper we re­port on the pre­sent sta­tus and per­for­mance of the sys­tem, as well as its im­mi­nent up­grades and new in­stal­la­tions. These in­clude the con­nec­tion of FLASH2, elec­tron bunch ar­rival time mon­i­tors for low charges, a new mas­ter laser pulse dis­tri­b­u­tion scheme, all-op­ti­cal syn­chro­niza­tion of the pump-probe laser and ar­rival time mea­sure­ments of the UV pulses on the e-gun pho­to­cath­ode. Along with the com­ing con­nec­tion of the ac­cel­er­a­tion mod­ules to the mas­ter laser and the switch of the low-level hard­ware to the uTCA plat­form, an out­look to im­proved feed­back strate­gies is given.