Pulse and field-resolved photon diagnostics at a superradiant THz user facility

In this work we demonstrate an approach of double arrival time monitors (ATM), which is employed to increase synchronization level between external femtosecond laser systems and 4th generation light sources. With comparison to the single arrival time monitor technique, which was routinely used for time resolved experiments at accelerator based light sources, here we demonstrate more than twice increase in the temporal resolution and elimination of temporal drifts. The proposed technique opens a way for sub femtosecond synchronization within large-scale facilities and laser systems.