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Winter, A.

Paper Title Page
MOPAN017 Noise and drift characterization of direct laser to RF conversion scheme for the laser based synchronization system for FLASH at DESY 182
  • F. Ludwig, B. Lorbeer, H. Schlarb, A. Winter
    DESY, Hamburg
  Funding: This contribution is funded by the EUROFEL project.

The next generation of FEL's (Free Electron Lasers) require a long and short term stable synchronisation of RF reference signals with an accuracy of 10 fs. For that an optical synchronisation system is developed for FLASH at DESY, that is based on optical pulse train which carry the timing information encoded in its precise repetition rate. The optical pulse train has to be converted into an RF signal to provide a local reference for calibration and operation of RF based devices. The drift and jitter performance of the optical to RF converter influences directly the phase stability of the accelerator. Three different methods for optical to RF converters, namely the direct photodiode detection, injection locking and a sagnac loop interferometer are currently under investigation. In this paper we concentrate on the jitter and drift performance of the direct photodiode conversion and show its limitations from measurement results.

MOPAN020 Status of the Laser Master Oscillator System at FLASH 191
  • A. Winter, F. Loehl, H. Schlarb, P. Schmuser
    DESY, Hamburg
  • W. J. Jalmuzna
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw
  An optical synchronization system based on the timing-stabilized distribution of ultra-short optical pulses has been proposed for next generation light sources, e.g. the European XFEL. The concept will be implemented and tested at FLASH at DESY. This paper describes the status of the optical master oscillator, which consists of two mode-locked Erbium-doped fiber lasers running in parallel.  
TUPMN023 Status of the Optical Replica Synthesizer at FLASH 965
  • S. Khan, J. Boedewadt, A. Winter
    Uni HH, Hamburg
  • G. Angelova, V. G. Ziemann
    UU/ISV, Uppsala
  • M. Hamberg, N. X. Javahiraly, M. Larsson, P. Salen, P. van der Meulen
    FYSIKUM, AlbaNova, Stockholm University, Stockholm
  • A. Meseck
    BESSY GmbH, Berlin
  • E. Saldin, H. Schlarb, B. Schmidt, E. Schneidmiller, M. V. Yurkov
    DESY, Hamburg
  A novel laser-based method to measure the longitudinal profile of ultrashort electron bunches, known as Optical Replica Synthesizer*, will be implemented at the free-electron laser FLASH at DESY. The paper describes its technical layout and the status of the project.

* E. Saldin, E. Schneidmiller, M. Yurkov, NIM A 539 (2005), 499