PROGRESS TOWARDS A PERMANENT OPTICAL SYNCHRONIZATION INFRASTRUCTURE AT FLASH

The optical synchronization system at FLASH has recently progressed from a bread-board/test-bench implementation to a more permanent engineered infrastructure. We report on the master laser oscillator, its lock to the master RF oscillator, the free-space pulse train distribution unit, the commissioning of the stabilized fiber links, bunch arrival-time monitors, an optical cross-correlator and the controls development. We also discuss a couple of design issues we identified while commissioning the devices.