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

Methoden und Instrumentierung Poster: Mi., 14:00–16:30 M-P44
The new Materials Science Synchrotron-Beamline HARWI II
T. Lippmann 1 , F. Beckmann 1 , R.V. Martins 1 , L. Lottermoser 1 , T. Dose 1 , H.-
U. Ruhnau 1 , A. Schreyer 1
1 Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht
The decision of the Helmholtz-Zentrum Geesthacht / Germany to build up and operate
Materials Science beamlines at DESY in Hamburg has now lead to the reconstruction
and completion of the first of these beamlines, HARWI II, located at the second
generation source DORIS. Thus, the expertise of the Institute for Materials Science
operating the research reactor FRG 1, i. e. mainly uses neutron scattering for materials
science investigations, will in future be complemented by synchrotron experiments.
These benefit from the availability of both high-energy and high-brilliant synchrotron
sources. HARWI II is dedicated to investigations of large samples. Global texture analyses,
stress and strain measurements and global imaging will be typical experiments.
A new high-field wiggler was installed and two in-vacuum monochromators are envisaged.
The first, a horizontal double-Laue type, provides a beam of 10 by 10 mm 2
size up to 250 keV and is already in use, whereas the vertical monochromator (20 to
150 keV) for a beam of 10 mm (height) and up to 70 mm (width) will be soon installed.
In addition, the beamstop at the rear end of the vacuum tank also provides a small
part of the ’white’ beam via a pinhole of 0.7 mm in diameter. The optical elements are
completed by various slits, shutters, beam filters and beam intensity monitors, which
are all located in an optics hutch made of concrete. In contrast, the experiment areas
downstream are ’conventional’ lead hutches. In the first hutch a large materials science
diffractometer will carry heavy samples and sample environments up to 600 kg weight.
Moreover, a conventional Eulerian cradle can be mounted on top of the instrument
and two detector arms allow measurements in the vertical using either a point detector
or a 2D–detector. The scattering setup is completed by a ’detector portal’, which allows
to position two additional 2D–detectors independently at any place in the hutch
in a distance up to 10 m away from the sample. The sample tower (including the
heavy load) can be moved outside the beam and two large tables can be independently
installed using elevators. The first table of 3 m length and 1.5 m width is dedicated
to user equipments, the second one permanently carries a tomography setup. In a
second experimental area the Geoforschungszentrum Potsdam is operating a press for
high–pressure experiments. Results of first experiments will be presented in further
contributions to this conference. The beamline is now available to external users.
Fig. 1: Scheme of the
HARWI II Beamline