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| THBAU03 |
Femtosecond Synchronization of Large-Scale X-ray Free Electron Lasers
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494 |
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- F. X. Kaertner, J. Chen, J. Cox, J. Kim
MIT, Cambridge, Massachusetts
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Future X-ray free-electron lasers require femtosecond timing accuracy between electron beams and optical lasers for improved FEL performance and to study the spatiotemporal dynamics of ultrafast processes. We present a set of new ultrafast optical techniques for long-term stable femtosecond synchronization of large-scale X-ray free-electron lasers. We use low-noise optical pulse trains generated from mode-locked lasers as timing signals, and distribute them via timing-stabilized fibre links to end-stations where tight synchronization is required. At the end-stations, optical and microwave sub-systems are synchronized with the delivered timing signals. Using these techniques, we demonstrate that remotely located lasers and microwave sources can be synchronized with femtosecond accuracy over typical operating periods of free-electron lasers. Specifically, we experimentally demonstrate timing and synchronization of multiple lasers and microwave sources over 300 m long fiber links with sub-10 fs precision over more than eight hours.
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