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Electron Bunch Timing with Femtosecond Precision in a Superconducting Free-Electron Laser

Electron Bunch Timing with Femtosecond Precision in a Superconducting Free-Electron Laser,10.1103/PhysRevLett.104.144801,Physical Review Letters,F. Lö

Electron Bunch Timing with Femtosecond Precision in a Superconducting Free-Electron Laser  
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F. Löhl, V. Arsov, M. Felber, K. Hacker, W. Jalmuzna, B. Lorbeer, F. Ludwig, K.-H. Matthiesen, H. Schlarb, B. Schmidt, P. Schmüser, S. Schulzhttp://academic.research.microsoft.com/io.ashx?type=5&id=19241501&selfId1=0&selfId2=0&maxNumber=12&query=
High-gain free-electron lasers (FELs) are capable of generating femtosecond x-ray pulses with peak brilliances many orders of magnitude higher than at other existing x-ray sources. In order to fully exploit the opportunities offered by these femtosecond light pulses in time-resolved experiments, an unprecedented synchronization accuracy is required. In this Letter, we distributed the pulse train of a mode-locked fiber laser with femtosecond stability to different locations in the linear accelerator of the soft x-ray FEL FLASH. A novel electro-optic detection scheme was applied to measure the electron bunch arrival time with an as yet unrivaled precision of 6 fs (rms). With two beam-based feedback systems we succeeded in stabilizing both the arrival time and the electron bunch compression process within two magnetic chicanes, yielding a significant reduction of the FEL pulse energy jitter.
Journal: Physical Review Letters - PHYS REV LETT , vol. 104, no. 14, 2010
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