Print Email Facebook Twitter Spin-echo development for a time-of-flight neutron reflectometer Title Spin-echo development for a time-of-flight neutron reflectometer Author Plomp, J. Contributor De Schepper, I.M. (promotor) Faculty Applied Sciences Department Radiation, radionuclides & reactors Date 2009-05-12 Abstract Neutron scattering techniques are a useful tool to determine structures in samples with sizes ranging from 1 x 10-10 up to 1 x 10-5 meter. Unfortunately powerful neutron sources are scares and expensive, which demands an efficient use of the available neutrons. This thesis focuses mainly on the practical realisation of a combination of two neutron scattering techniques; neutron reflectometry and neutron spin-echo angle labelling. This special combination will not only result in more efficient neutron scattering measurements but will also open up possibilities for new types of measurements. OffSpec is a new dedicated spin-echo reflectometer which is designed to accommodate the fusion of the two techniques and is located at the Second Target Station at ISIS in the United Kingdom. It will be ready for user operation mid 2009. Delft University of Technology has been responsible for the development and production of the spin-echo components for OffSpec. A flexible mechanical design results in five different applications for this spectrometer: ultra small-angle scattering by spin-echo, high intensity measurements on in-plane - nanometre to micrometre - correlations, high resolution measurements for bent or wavy samples, possibility to separate specular and off-specular scattering within a detector pixel, and inelastic spin-echo in transmission or in reflection. A large part of this thesis work consists of the design and build of these spin-echo components. A dedicated beam at the Reactor Institute Delft was used to test the components and built a number of prototypes spectrometers. These prototypes were used to perform proof of principle measurements for several different instrumental modes which are described in this thesis. Subject spin-echolarmor precessionreflectometryusans To reference this document use: http://resolver.tudelft.nl/uuid:a9d3fda7-7833-42d6-9c18-dd07810ab75e ISBN 978-90-9024161-6 Part of collection Institutional Repository Document type doctoral thesis Files PDF plomp_20090512.pdf 7.41 MB Close viewer /islandora/object/uuid:a9d3fda7-7833-42d6-9c18-dd07810ab75e/datastream/OBJ/view