Arrival timing diagnostics at a soft X-ray free-electron laser beamline of SACLA BL1

An arrival timing monitor for the soft X-ray free-electron laser (XFEL) beamline of SACLA BL1 has been developed. A small portion of the soft XFEL pulse is branched using the wavefront-splitting method. The branched FEL pulse is one-dimensionally focused onto a GaAs wafer to induce a transient reflectivity change. The beam branching method enables the simultaneous operation of the arrival timing diagnostics and experiments. The temporal resolution evaluated from the imaging system is ∼ 22   fs in full width at half-maximum, which is sufficient considering the temporal durations of the soft XFEL and the optical laser pulses.

Source: Journal of Synchrotron Radiation - March 31, 2019 Category: Physics Authors: Owada, S. Nakajima, K. Togashi, T. Katayama, T. Yumoto, H. Ohashi, H. Yabashi, M. Tags: soft X-ray free-electron lasers arrival timing diagnostics beamlines Source Type: research