Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments
CPP 7.22: Poster
Montag, 26. März 2007, 16:00–18:00, Poster B
Upgrades of two SANS diffractometers at the Munich reactor FRM-II — •Henrich Frielinghaus, Aurel Radulescu, Peter Busch, Vitaly Pipich, Alexander Ioffe, Dietmar Schwahn, and Dieter Richter — Forschungszentrum Jülich GmbH, Jülich Centre of Neutron Science, D-52425 Jülich
Political decisions made the Jülich reactor FRJ-2 shut down, and the high performance instruments are moved to Munich now. The two SANS diffractometers are transferred, and refurbished in a second step in order to meet the world leading machines. Neutron polarization and polarization analysis will be possible to study magnetic samples. Supermirrors and 3He filters will be installed. Aspherical neutron MgF2 lenses aim at two goals: 10 to 20 times higher intensity and a resolution of Δ Q = 10−4Å. The lenses will be cooled to minimize the thermal diffuse scattering. A high resolution detector (Δ x = 0.5mm) allows to collect the high resolution scattering patterns. To operate with high resolution at finite Q a chopper placed behind the selector will reduce the wavelength uncertainty to 1% and better by a TOF analysis. The newly developed TiSANE mode will be possible: The neutron pulses will be triggered by a periodic external field at the sample in concert with the projected time-dependent scattering collected by the detector. We expect to resolve kinematic processes in the range of 2µs to 5ms and above. In this mode the Q-resolution typically is not improved. The GISANS option allows to study the lateral structure of thin films in the range of 10 to 1000Å with a free depth resolution. Here we aim at soft condensed matter and magnetic films.