ROMAN MINIKAYEV

HASYLAB/DESY

HAMBURG

GERMANY

Duration of visit: 14-23 March 2004

REPORT

The visitor has visited the W1.1 beamline at Hasylab/DESY and, during discussions with the beamline scientist, Dr. Oliver Seeck, he learned about the experimental performances of the diffractometer installed at this beamline. Trial measurements of the structural properties of iron-based thin layers and multilayers were performed. The HARWI-2 beamline being under construction was visited, as well. Its status permits to expect that the first high-pressure measurements at this beamline will be possible at the end of 2004. The plans of the installation of various instruments were presented by Dr. Christian Lathe.

At the photograph above, the beam hutch of W 1.1 beamline is shown. There is one diffractometer available in the experimental hutch and the size of the goniometer allows for the setup of other large equipment (cryostats etc.). The diffractometer was initially designed for surface diffraction measurements with horizontal instrument axis but can be used for many other purposes. The vertical sample surface can be oriented by means of two translations and two tilts. For grazing incidence the spectrometer axis may be tilted in the horizontal plane by ±10°. The goniometer head may be replaced by a standard 4 circle setup, shared with beamline C. In addition, a setup of the 4 circle in a horizontal scattering geometry is possible. At the detector arm, an analyzer setup can be mounted as well as a special rod-scan arm, which permits to scan the entire hemisphere above the sample. Between beam port and the diffractometer is a lift table which can be used to set up an EXAFS experiment or mirror chambers to deflect the beam downwards for reflectivity measurements of liquid surfaces.