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We describe the concepts and technical realization of the high-resolutionsoft-X-ray beamline ADRESS operating in the energy range from 300 to 1600 eVand intended for Resonant Inelastic X-ray Scattering (RIXS) and Angle-ResolvedPhotoelectron Spectroscopy (ARPES). The photon source is an undulator of novelfixed-gap design where longitudinal movement of permanent magnetic arrayscontrols not only the light polarization (including circular and 0-180 degrotatable linear polarizations) but also the energy without changing the gap.The beamline optics is based on the well-established scheme of plane gratingmonochromator (PGM) operating in collimated light. The ultimate resolving powerE/dE is above 33000 at 1 keV photon energy. The choice of blazed vs lamellargratings and optimization of their profile parameters is described. Due toglancing angles on the mirrors as well as optimized groove densities andprofiles of the gratings, high photon flux is achieved up to 1.0e13photons/s/0.01%BW at 1 keV. Ellipsoidal refocusing optics used for the RIXSendstation demagnifies the vertical spot size down to 4 um, which allowsslitless operation and thus maximal transmission of the high-resolution RIXSspectrometer delivering E/dE better than 11000 at 1 keV photon energy. Apartfrom the beamline optics, we give an overview of the control system, describediagnostics and software tools, and discuss strategies used for the opticalalignment. An introduction to the concepts and instrumental realization of theARPES and RIXS endstations is given.

High-resolution soft-X-ray beamline ADRESS at Swiss Light Source for  resonant inelastic X-ray scattering and angle-resolved photoelectron  spectroscopies