Table 1. The positions of all optical components for the HED beamline at the SASE2 undulator.

CRL2 and CRL3 will be used alternatively. The beam diameter is calculated using the set-up of Fig. 4 ▸ (Nakatsumi et al., 2014 ▸).

Optical element	Position	Focal length	Beam diameter (FWHM)	Diameter (FWHM) without CRLs
CRL1	z = 229 m	f = 131–140 m	0.93 mm	–
Off-set mirror 1	z = 290 m	–	0.74 mm	1.18 mm
Off-set mirror 2	z = 301 m	–	0.71 mm	1.24 mm
Distribution mirror	z = 390 m	–	Neglected
SDU	z = 846–852 m	–	0.99 mm	3.27 mm
CRL2	z = 857 m	f = 84–86 m	1.08 mm	–
CRL3	z = 962 m	f = 7–9 m	1.28 mm	–
Experiment/spot	z = 972 m	–	20 µm	3.89 mm