Paper |
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TUPC33 |
Femtosecond Stable Laser-to-RF Phase Detection for Optical Synchronization Systems |
447 |
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- T. Lamb, M.K. Czwalinna, M. Felber, C. Gerth, H. Schlarb, S. Schulz, C. Sydlo, M. Titberidze, F. Zummack
DESY, Hamburg, Germany
- E. Janas
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
- J. Szewiński
NCBJ, Świerk/Otwock, Poland
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Optical reference distributions have become an indispensable asset for femtosecond precision synchronization of free-electron lasers. At FLASH and for the future European XFEL, laser pulses are distributed over large distances in round-trip time stabilized fibers to all critical facility sub-systems. Novel Laser-to-RF phase detectors will be used to provide ultra phase stable and long-term drift free microwave signals for the accelerator RF controls. In this paper, we present the recent progress on the design of a fully integrated and engineered version of the L2RF phase detector, together with first experimental results demonstrating so-far unrivaled performance.
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Poster TUPC33 [18.910 MB]
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WEPC31 |
New Design of the 40 GHz Bunch Arrival Time Monitor Using MTCA.4 Electronics at FLASH and for the European XFEL |
749 |
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- M.K. Czwalinna, C. Gerth, H. Schlarb
DESY, Hamburg, Germany
- S. Bou Habib
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
- S. Korolczuk, J. Szewiński
NCBJ, Świerk/Otwock, Poland
- A. Kuhl
Uni HH, Hamburg, Germany
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At free-electron lasers, today's pump-probe experiments and seeding schemes make high demands on the electron bunch timing stability with an arrival time jitter reduction down to the femtosecond level. At FLASH and the upcoming European XFEL, the bunch train structures with their high bunch repetition rates allow for an accurate intra-train stabilisation. To realise longitudinal beam-based feedbacks a reliable and precise arrival time detection over a broad range of bunch charges, which can even change from 1 nC down to 20 pC within a bunch train, is essential. Benefitting from the experience at FLASH, the current bunch arrival time monitors (BAMs), based on detection of RF signals from broad-band pick-ups by use of electro-optic modulators, are further developed to cope with the increased requirements. In this paper, we present the new BAM prototype, including an adapted electro-optical front-end and the latest development of the read-out electronics based on the MTCA.4 platform.
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