| Paper |
Title |
Page |
| RPAT050 |
Electro Optic Bunch Length Measurements at the VUV-FEL at DESY
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3111 |
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- B. Steffen, S. Casalbuoni, E.-A. Knabbe, H. Schlarb, B. Schmidt
DESY, Hamburg
- P. Schmüser, A. Winter
Uni HH, Hamburg
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For the operation of a SASE FEL, the longitudinal bunch length is one of the most critical parameters. At the superconducting linac of the VUV-FEL at DESY, we have installed an electro optic sampling (EOS) experiment to probe the time structure of the electric field of the bunches to better than 100 fs rms. The field-induced birefringence of a ZnTe crystal is detected by a femtosecond laser pulse (TiSa) and the time structure is measured by scanning the relative timing of the electron bunch and the TiSa pulse. A synchronization stability of better than 50 fs between laser and accelerator RF has been achieved. First results on the synchronization measurements and for the bunch length as function of the linac parameters are presented.
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| RPAT094 |
Femtosecond Synchronisation of Ultrashort Pulse Lasers to a Microwave RF Clock
|
4299 |
| |
- A. Winter
Uni HH, Hamburg
- N. Ignashin, A. Simonov, S. Sytov
IHEP Protvino, Protvino, Moscow Region
- E.-A. Knabbe, S. Simrock, B. Steffen
DESY, Hamburg
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A precise synchronization between the laser repetition rate and the linac-RF is mandatory for electro-optic sampling or pump-probe experiments. The level of stability is usually determined by measuring of the spectral noise power density of the feedback signal when the system is locked. However, an independent measurement is needed to confirm this. In this paper, we present an approach exploiting electronic techniques to synchronize a TiSa laser to the RF of the DESY VUVFEL with sub-50 fs stability. The remaining time jitter is measured by an RF monitoring system independent of the locking PLL.
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