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Methoden und Instrumentierung Poster: Mi., 14:00–16:30 M-P87
The Variable Polarization XUV Beamline at PETRA III
Jens Viefhaus 1
1 HASYLAB bei DESY, Notkestr. 85, 22607 Hamburg
The 6 GeV energy of the storage ring PETRA III (DESY, Hamburg) together with
its very low emittance of 1 nm rad makes it an excellent facility to host a Variable
Polarization XUV Beamline. The high brilliance and flux of the beamline provided
in a broad photon energy range (200 eV to 3000 eV) will open up completely new
scientific opportunities in fields like:
A. Spectromicroscopy
B. High resolution photoelectron spectroscopy
C. Soft X-Ray scattering
D. Magnetic studies E. Gas phase targets
F. Surface Chemistry
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 structure in complex materials by exploiting atomic
resonances.
In the future polarization-dependent studies with soft X-rays will play a key role in
enhancing our knowledge of the structure of matter. The source of the beamline will
be a 5 m APPLE-II-type undulator (65.6 mm period) allowing full polarization control
by the user. The undulator can operate over the whole photon energy range in the
first harmonic thereby simultaneously providing high flux and complete polarization.
Using current technology it is possible to achieve a spectral resolving power of more
than 10000 at 1 keV with an extremely high flux (more than 10 12 photons/sec) focused
on the sample.
Special attention will be paid to provide both small focal spot size as well as high
photon flux required by the different user communities.
Together with the main source parameters a detailed layout of the beamline will be
presented.
User operation of the beamline will start in 2009 right after the startup phase of
PETRA III.