Abstract: Free electron laser is more and more popular with its characteristics of extremely high peak brightness, ultra-short pulse and high coherence, providing unprecedented research opportunity for physics, chemistry, biomedicine, materials science and energy science. Hight accurate time-resolved pump-probe experiment requires 10 fs level synchronization ability. Femtosecond synchronization system is the core system to ensure that free electron laser facility can work and run stable for a long time. Optical and RF synchronization technologies play important roles for free electron laser, especially for kilometer-scale facilities. The tasks of the femtosecond synchronization system: To produce a clock reference source with femtosecond level accuracy; 10 fs-level synchronize tens to several hundred clients for Laser, LLRF, Diagnostic, and Timing system with different requirements (optical/RF reference, frequency, power, accuracy, etc.).
In this presentation, an introduction to three projects Dalian Coherent Light Source (DCLS), Dalian Advanced Light Source (DALS), and Shenzhen Superconducting Soft-X-ray Free Electron Laser (S³FEL) are given. The synchronization systems of DCLS and DALS are built. S3FEL is a high repetition rate soft-X-ray super-conducting free-electron laser facility that consists of a 2.5 GeV CW superconducting linear accelerator and three initial undulator lines, which aims at generating X-Rays between 40 eV and 1 keV at rates up to 1 MHz. An optical and RF combined synchronization system is under designing.
Zhichao Chen received a Bachelor degree in applied physics from Dalian University of Technology (DUT) in 2003, a Doctor degree in physical chemistry from Dalian Institute of Chemical Physics (DICP) in 2011, and a Doctor degree in physics from Radboud University Nijmegen in the Netherlands in 2012. He joined DICP and focused on small molecules photochemistry dynamics in 2011. Since 2017, he was responsible for femtosecond synchronization system for FELs. His research interests are synchronization system for large facility, experimental station design and photochemistry dynamics of small molecules.