| Paper |
Title |
Page |
| TOPB003 |
Progress in Large-Scale Femtosecond Timing Distribution and RF-Synchronization
|
284 |
| |
- F.X. Kaertner, H. Byun, J. Chen, F J. Grawert, F.O. Ilday, J. Kim, A. Winter
MIT, Cambridge, Massachusetts
|
|
| |
For future advances in accelerator physics in general and seeding of free electron lasers (FELs) in particular, precise synchronization between low-level RF-system, photo-injector laser, seed radiation as well as potential probe lasers at the FEL output is required. We propose a modular system based on optical pulse trains from mode-locked lasers for timing distribution and timing information transfer in the optical domain to avoid detrimental effects due to amplitude to phase conversion in photo detectors. Synchronization of various RF- and optical sub-systems with femtosecond precision over distances of several hundred meters can be achieved. First experimental results and limitations of the proposed scheme for timing distribution are discussed.
|
|
| RPPT039 |
Stabilized Optical Fiber Links for the XFEL
|
2589 |
| |
- A. Winter
Uni HH, Hamburg
- J. Chen, F J. Grawert, F.O. Ilday, F.X. Kaertner, J. Kim
MIT, Cambridge, Massachusetts
- H. Schlarb, B. Schmidt
DESY, Hamburg
|
|
| |
The timing synchronization scheme for the European X-Ray free electron laser facility (XFEL) is based on the generation and distribution of sub-picosecond laser pulses with actively stabilized repetition rate which are used to synchronize local RF oscillators. An integral part of the scheme is the distribution of the optical pulse stream to parts of the facility via optical fiber links. The optical path length of the fiber has to be stabilized against short-term and long-term timing jitter due to environmental effects, such as temperature drifts and acoustic vibrations, to better than 10 fs for distances ranging from tens of meters to several kilometers. In this paper, we present first experimental results for signal transmission through a km-long fiber link with femtosecond stability.
|
|