Table 1. Summary of the key parameters of the photon beam.

Photon energy range	2.2–20 keV
Bandwidth ΔE/E (SASE XFEL)	∼5 × 10−3 (natural bandwidth)
	∼1 × 10−4 [Si(111) double-crystal monochromator]
Maximum repetition rate	60 Hz
X-ray pulse duration	∼50 fs in FWHM
Photons per pulse at 10 keV (at the interaction region)	∼3 × 1011 (natural bandwidth)
	∼6 × 109 [Si (111) double-crystal monochromator]
Photon beam size at 10 keV	∼300 µm × 300 µm in FWHM