Deutsche Tagung f ¨ur Forschung mit ... - SNI-Portal

Methoden und Instrumentierung Poster: Mi., 14:00–16:30 M-P76
The future High Resolution Diffraction Beamline at PETRA III
Oliver H. Seeck 1
1 Hasylab am DESY, Notkestrasse 85, 22603 Hamburg, Germany
In the coming years the existing storage ring PETRA at DESY (Hamburg, Germany)
will be completely reconstructed. From 2009 on it will serve as dedicated third generation
synchrotron radiation source, called PETRA III. Compared to existing third generation
sources, such as ESRF and APS, the brilliance of the photon beams will be
a factor of 2 to 4 higher. Especially, the collimation of the beam and the coherence
properties will be extraordinary.
At PETRA III, 14 independent undulators will be installed at 9 sections. 5 sections
will be shared by two undulators with a canting angle of 5mrad. This separation is
sufficient to install independent front end equipment (such as shutters, collimators) but
too small to build up two fully independent experiments. Therefore, one experiment at
a sharing section has to be artificially offset by some offset optics.
The High Resolution Diffraction Beamline (HighRes) will share a section with the Magnetic
Resonant Scattering Beamline. HighRes will be the offset beamline with a vertical
offset of approximately 1.5m. It will cover a photon energy range from 5.4 keV to 30 keV.
The x-ray beam will be delivered in three different modes regarding the requirements of
the users. At 10 keV, in the raw mode the beam will have a size of (2×1) mm 2 (FWHM)
and a divergence of ±(10×6) µrad 2 , with the notation (horizontal×vertical). The collimation
mode will deliver (1×0.5) mm 2 (FWHM) and a divergence of ±(3×0.2) µrad 2 .
At the focussing mode the beamsize will be (300×15) µm 2 (FWHM) with a divergence
of ±(15×5) µrad 2 . The flux at the sample will be >10 12 ph/s at an energy resolution
of 0.2 eV.
HighRes will be presented including timetable, design, and equipment. Ray tracing
calculations will be shown to demonstrate the stability of the beam and its capability
to perform high �q–resolution investigations.