Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Polymer Physics III

CPP 32.9: Vortrag

Donnerstag, 26. März 2009, 11:45–12:00, ZEU 222

High Intensity - High Resolution Small-Angle Neutron Diffractometers of JCNS at FRM II — •Aurel Radulescu — Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 85747 Garching, Deutschland

The KWS-1 and KWS-2 small-angle neutron diffractometers of Jülich Centre for Neutron Science are currently reconstructed at the Research Neutron Source Heinz Maier-Leibnitz (FRM II) in Garching-München. With a high flux supplied by the cold neutron source of FRM II and the newly designed optimized neutron guide and with a new collimation system allowing a larger experimental flexibility the instruments will be dedicated facilities for structural studies in the field of soft-matter and magnetic systems. The standard of 5x5 cm2 neutron guides leads to high intensities with standard resolution and provides a maximum flux close to world leading SANS instruments, as for example D22, ILL-Grenoble. Further support is obtained by neutron lenses that allow for larger sample apertures of 5x5 cm2 without loosing any resolution. High counting rates (up to 600kHz) will be detectable with a dead-time of about 0.6 microsec for either homogeneous or strong inhomogeneous scattering patterns distributed on the scintillation detector. The high resolution mode is supported by a chopper, which will allow a variation of the wavelength spread between 10% (as delivered by the velocity selector) and 1%. Additionally, the neutron lenses in combination with small collimation apertures lead to smallest Q-vectors of around 0.0001 1/Å. The high intensity and high resolution options of the KWS-1 and KWS-2 SANS instruments will be presented in details.