Beamline, experimental stations and photon beam diagnostics for the hard x-ray free electron laser of SACLA

TLDR

The SACLA XFEL beamline delivers hard x‑ray pulses (4.5–19.5 keV) via a pink beam or monochromatic beam, supporting experiments such as diffraction, imaging, spectroscopy, and pump‑and‑probe in experimental hutches with synchronized femtosecond lasers. Photon diagnostics were performed to measure radiation parameters shot‑by‑shot. This approach provides per‑shot radiation parameter measurements.

Abstract

A beamline for the x-ray free electron laser (XFEL) of SPring-8 Angstrom Compact free electron LAser (SACLA) provides hard x-ray pulses in the range 4.5–19.5 keV. Its optical system in an optics hutch delivers a pink beam below 15 keV with either of two double-mirror systems or a monochromatic beam with a double-crystal monochromator. These XFEL beams are used for various types of measurement at experimental stations, e.g. x-ray diffraction, coherent diffraction imaging, x-ray spectroscopy and pump-and-probe measurement. The experimental stations consist of experimental hutches and control stations, and a femtosecond optical laser which is synchronized with XFEL pulses. Photon diagnostics have been performed for measuring radiation parameters in a shot-by-shot manner.