Journal article
The monochromatic imaging mode of a RITA-type neutron spectrometer
Department of Materials Research, Risø National Laboratory, Building 227, Frederiksborgvej 399, DK-4000 Roskilde, Denmark1
Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark2
Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen, DK-2100 Copenhagen, Denmark3
The imaging monochromatic mode of a neutron spectrometer with a multi-bladed RITA analyser system is so far unexplored. We present analytical calculations that define the mode. It is shown that the mode can be realised for PG (002) analyser crystals, from incident energies of about 3.2 meV and up, allowing the important cases of 3.7, 5.0 and 13.7 meV.
Due to beam divergence, the neutron rays from neighbouring analyser blades are found to overlap slightly. Hence, the optimal use of the monochromatic imaging mode would be found by employing an adjustable radial collimator to limit the spread of the ray from each analyser blade.
| Language: | English |
|---|---|
| Year: | 2004 |
| Pages: | 667-681 |
| ISSN: | 18729584 and 0168583x |
| Types: | Journal article |
| DOI: | 10.1016/j.nimb.2004.07.005 |
| ORCIDs: | Lefmann, K. |
