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Updated: Jan 25, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Arrival timing diagnostics at a soft X-ray free-electron laser beamline of SACLA BL1
Shigeki Owada1, Kyo Nakajima1, Tadashi Togashi1
1Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun 6795198, Japan.
Abstract:
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.
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