Figure 2.

Schematic of the layout of the undulator and photon tunnels and of the instruments at the European XFEL. The linear accelerator is to the left of the figure. The SASE1, SASE2 and SASE3 undulator positions are visible; between the SASE1 and the SASE2 tunnels, the two additional undulator tunnels available for future developments are shown. MID, materials imaging and dynamics; HED, high-energy density matter experiments; SPB, single molecules, clusters and biomolecules; FXE, femtosecond X-ray experiments; SQS, small quantum systems; SCS, spectroscopy and coherent scattering. (Online version in colour.)