The variable polarization XUV beamline at PETRA III

The storage ring PETRA III (DESY, Hamburg) with its very low emittance of 1 nm rad makes it an excellent facility to host a Variable Polarization XUV Beamline. User operation of the beamline will start in 2009 right after the startup phase of PETRA III. The high brilliance and flux of the beamline provided in a broad photon energy range (200 eV to 3000 eV) will open up new scientific opportunities in fields like high resolution PES, spectroscopy of dilute targets, emvironmental chemistry and many more. Key absorption edges of practically all important elements lie in the range of photon energies provided by the beamline which creates the possibility to uniquely determine the element-specific local electronic structures. Of equal importance will be polarization-dependent studies using the 5 m APPLE-II-type undulator (65.6 mm period) which allows full polarization control by the user and operates over the whole photon energy range in the first harmonic providing both high flux and complete polarization. Using state-of-the-art technology it is possible to achieve a spectral resolving power of more than 10000 with an extremely high flux (≥1012 photons/sec) inside a focal spot of the order of 10 μm. Together with the main source parameters a detailed layout of the beamline will be presented