P04 Variable Polarization XUV Beamline

P04 is providing soft X-ray radiation with variable polarization to experiments at energies between 250 eV and 3 keV. The beamline offershigh energy resolution in the range from some tens of meV to about 1eV and high spatial resolution in the 10-µm regime. it is suited for new classes of experiments with soft x-rays in the fields of gas phase physics, gneticspectroscopy, high resolution photoelectron spectroscopy, surface chemistry, soft x-ray diffraction and holography.

The unique characteristics of this beamline are an exceptionally high photon flux – up to several 10E+12 photons per second – in a very small bandpass (resolving power exceeds 10,000) as well as variable polarization properties over a very wide energy range (200-3000 eV) using only the first harmonic of an APPLE-2 type undulator.

Due to the very low emittance of the PETRA III storage ring the radiation of the beamline is practically coherence limited in the whole photon energy range except for the horizontal source size (300 µm FWHM). The beam is supplied by a 5 m long APPLE-2-type undulator installed in one of the straight sections.


Beamline Energy Resolution
0 * 10-6 [meV] @ 1 [eV]
Beamline Resolving Power
0 * 103 [deltaE/E] @ 1 [eV]
Beamline Energy Range
265 - 3000 [eV]
Max Flux On Sample
0 * 1013 [ph/s] @ 1 [eV]
Spot Size On Sample Hor
0 - 5000 [um]
Spot Size On Sample Vert
0 - 2000 [um]
Moritz Hoesch
Jörn Seltmann
  • Time-resolved studies
  • XMCD
Emission or Reflection
  • Micro XRF
  • Polarimetry
  • X-ray fluorescence (XRF)
  • Fluorescence imaging
  • X-ray holography
  • X-ray microscopy
  • X-ray tomography
Photoelectron emission
  • Angular Resolved PES
  • Photoelectron diffraction
  • Spin-resolved ARPES
  • Time-resolved studies
  • XPS
  • Coherent scattering
  • Elastic scattering
  • Inelastic scattering
  • Magnetic scattering
control/Data analysis
Control Software Type
  • Tango (Online), Python, IDL, ...
Data Output Type
  • spectra
Data Output Format