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Berlin 2005 – scientific programme

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VA: Vakuumphysik und Vakuumtechnik

VA 2: Quanten, Neutronen und Positronen

VA 2.3: Talk

Monday, March 7, 2005, 11:40–12:00, TU E20

The structure powder diffractometer (SPODI) at the FRM-II: status and applications — •Michael Schlapp1,2, Markus Hölzel1,2, Ralph Gilles1, Bernhard Krimmer1, Hans Boysen3, and Hartmut Fueß21TU München, ZWE-FRM-II, Lichtenbergstr. 1, 85748 Garching — 2TU Darmstadt, Petersenstr. 23, 64287 Darmstadt — 3Ludwig-Maximilians-Universität München, Theresienstr. 41, 80333 München

The new Structure POwder DIffractometer SPODI was built up and taken into operation at the neutron source FRM-II. This diffractometer is equipped with several unique components which distinguish it from other powder diffractometers : a 14.5 m long neutron guide coated with supermirrors, a vertically focussing Ge(551) waferstack monochromator with a take-off angle of 155 and 300 mm high position sensitive 3He-counter tubes. Due to the exceptional geometrical features, the SPODI is equipped with a small-angle scattering apparatus, which extends the accessible range of the scattering vector down to Q=0.003 Å-1. First experiments made during the calibration and alignment phase of the structure powder diffractometer show very promising results. In this contribution we present the current status of the instrument as well as an outlook to possible experiments at the structure powder diffractometer SPODI.

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