guest ::
| Home > Institute Collections > PGI > PGI-4 > Development of multi-spectral direct geometry chopper spectrometers for the futureEuropean Spallation Source |
| Home > Institute Collections > PGI > PGI-4 > Development of multi-spectral direct geometry chopper spectrometers for the futureEuropean Spallation Source |
| Conference Presentation (Other) | FZJ-2013-00646 |
; ; ; ; ; ; ; ; ; ;
2012
Abstract: Within the ESS Design Update Phase Programme funded by the German Federal ministry of education and research, we investigate the performance of a set of spectrometer concepts at the future long pulse source of the ESS, which promises the applicability to a wide manifold of scientific activities of research: strongly correlated electron materials, disordered systems, functional materials, magnetism, soft-matter and biophysics. Here we present the current state-of-the-art in the study of the instrument conceptual design. The chopper system is a crucial aspect in order to achieve useful resolution for a manifold of scientific purposes, make an efficient use of the flux provided by the source, by means of the Repetition Rate Multiplication and reduce contaminations due to very fast and very slow neutrons. We present the chopper layout under investigation and the method for the RRM implementation, based on the commensurate choppers technique. The useful beam at the sample position is an important figure of merit in the evaluation of the instrument performance and can be a limit to possible scientific applications in several circumstances, when high flux is requested. The problem of the beam transport to the sample is under consideration, in order to transport as much as possible of the phase space density provided by the source, maintaining as low as possible the back-ground contamination coming from the direct view of the pulsed source. The technical implications of the polarization analysis option are discussed. The necessary requirements for the detector development in terms of spatial and time resolution are already evaluated and the implications deriving from technical limitations on this task are discussed. Preliminary results of virtual experiments performed by means of beam neutron ray-tracing simulation packages are presented, especially focusing on the resolution function evaluation.
|
The record appears in these collections: |