Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster: New Instruments and Methods

CPP 15.6: Poster

Dienstag, 27. März 2012, 18:15–20:15, Poster A

Conceptual design for a new small angle X-ray scattering instrument at the Petra III extension — •Rainer Gehrke, Ulla Vainio, and Jan Perlich — Deutsches Elektronensynchrotron DESY, Notkestrasse 85, D-22603 Hamburg (Germany)

The storage ring DORIS III at DESY/Hamburg will stop operation at the end of 2012. A couple of experimental techniques which are presently not available at PETRA III have to be established at the new machine. Among these techniques are the various kinds of small angle X-ray scattering with moderately focused beams which are carried out at DORIS III beamlines A2, B1, and BW4 at present. In the frame of a PETRA III extension project a new versatile SAXS instrument is under planning which will allow performing SAXS in transmission and reflection geometry. It will feature a mini-undulator, a non-dispersive double crystal monochromator, horizontally and vertically focusing mirrors, and a maximum sample to detector distance of about 20 meters. The planned setup will also offer to utilize anomalous scattering in all possible scattering geometries.

The details of the components of the beamline layout (source, optics, experimental hutch) are discussed and ray tracing calculations are presented which allow estimating the beam properties in terms of beamsize, photon flux, etc.