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Proceedings Paper

Neutron ray-tracing simulations and data analysis with RESTRAX
Author(s): Jan Saroun; Jiri Kulda
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Paper Abstract

We review the methods of simulating the neutron optics of three-axis spectrometers to optimize their resolution and luminosity and to interpret experimental data collected with them. The program package RESTRAX includes both a high-speed analytical (Gaussian) convolution algorithm and a Monte Carlo ray-tracing code providing enhanced accuracy in description of most of the spectrometer components. The program is designed for a fixed spectrometer layout, with emphasis on the choice of a complete set of usual neutron optical devices and on their realistic representation. The fixed layout permits to generate a highly optimized Fortran code, producing sets of 1000 - 10000 successful events per second. This speed on the turn allows for a truly interactive work when designing a new instrument or refining a model describing the scattering behavior of a sample under investigation. As an illustration, we give several examples of TAS configurations, including high-luminosity focusing arrangements and multianalyzer setups as well a demonstration of the data fitting part of RESTRAX in the case of magnetic excitations.

Paper Details

Date Published: 21 October 2004
PDF: 10 pages
Proc. SPIE 5536, Advances in Computational Methods for X-Ray and Neutron Optics, (21 October 2004); doi: 10.1117/12.560925
Show Author Affiliations
Jan Saroun, Nuclear Physics Institute (Czech Republic)
Institut Laue-Langevin (France)
Jiri Kulda, Institut Laue-Langevin (France)

Published in SPIE Proceedings Vol. 5536:
Advances in Computational Methods for X-Ray and Neutron Optics
Manuel Sanchez del Rio, Editor(s)

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