Ludwig, F.

Paper	Title	Page
WG503	Synchronization System for the XFEL
	H. Schlarb, F. Loehl, F. Ludwig, S. Simrock DESY, Hamburg F. X. Kaertner, J. Kim MIT, Cambridge, Massachusetts A. Winter Uni HH, Hamburg
	The production of ultra-short electron bunches in Free Electron Lasers puts complete new demands on the sychronisation systems for the accelerator and its sub-system. Novel new techniques using laser pulses, distributed in optically stabilized fiber-links, provide the possibility to synchronize with femtosecond stability critical components such as mode-locked lasers for pump-probe experiments, or diagnostic purposes, and local RF oscillators for the LLRF controls to the machine reference. In this talk an overview of the layout for the XFEL synchronization system and its sub-components is given.
	Slides
WG506	Compact Ultra-High Precision Beam Phase Monitor System
	F. Loehl, K. E. Hacker, F. Ludwig, H. Schlarb, B. Schmidt DESY, Hamburg A. Winter Uni HH, Hamburg
	For the operation of free-electron lasers, in particular for experiments carried out in pump-probe configurations, a precise synchronization between the photo-injector laser, low-level RF-systems, probe lasers, and other components is mandantory. A measurement of the jitter in the arrival-time of the electron bunch with respect to the clock signal of a master oscillator is, therefore, of special importance. We present an ultra-precise arrival-time monitor system based on a broadband beam pick-up which permits measurements in the sub-100 fs regime. With the inductively shaped RF-pulse from the beam pick-up the amplitude of an ultra-short laser pulse is modulated using an electro-optical modulator with appropriate bandwidth. This modulation is detected by a photo detector and sampled by a fast ADC. As sampling laser the master laser oscillator of the machine is used directly. Therefore, no additional devices are required that may add timing jitter. We present the layout of the system and first experimental results.
	Slides