Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 9: Poster: Synthesis of Nanostructured Films by Self-organization, Thermoelectric Thin Films and Nanostructures, High-k and Low-k Dielectrics, Layer Deposition Processes, Layer Growth, Layer Properties, Application of Thin Films, Surface Modification, Hard and Superhard Coatings, Metal Layers

DS 9.40: Poster

Montag, 22. März 2010, 15:00–17:30, Poster D1

Focusing Neutron Beams to Sub-Millimeter Size — •roxana valicu and peter böni — Physik-Department E21, Technische Universität München, D-85747 Garching, Germany

Focusing neutron guides are a well-established means to significantly increase the neutron flux for the investigation of small samples or samples subject to extreme conditions such as pressure or high magnetic fields. Parabolic and elliptic guides can focus the beam in a single point beyond the guide exit with well defined beam characteristics and a gain in intensity of over 30 compared to a non-focused beam. Focusing guides find applications in elastic and inelastic neutron scattering as well as in neutron imaging to increase the spatial resolution and for magnification. The aim of the Monte Carlo simulations using McStas was to produce focal spots with a diameter of the order of 0.1 mm using supermirrors with large angles of reflection. We will discuss the results of our simulations, i.e. the gains obtained, their variation with wavelength as well as the evolution of the beam size.