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Proceedings Paper

The neutron instrument simulation package, NISP
Author(s): Philip A. Seeger; Luke L. Daemen
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Paper Abstract

The Neutron Instrument Simulation Package (NISP) performs complete source-to-detector simulations of neutron instruments, including neutrons that do not follow the expected path. The original user interface (MC_Web) is a web-based application, This report describes in detail the newer stand-alone Windows version, NISP_Win. Instruments are assembled from menu-selected elements, including neutron sources, collimation and transport elements, samples, analyzers, and detectors. Magnetic field regions may also be specified for the propagation of polarized neutrons including spin precession. Either interface writes a geometry file that is used as input to the Monte Carlo engine (MC_Run) in the user's computer. Both the interface and the engine rely on a subroutine library, MCLIB. The package is completely open source. New features include capillary optics, temperature dependence of Al and Be, revised source files for ISIS, and visualization of neutron trajectories at run time. Also, a single-crystal sample type has been successfully imported from McStas (with more generalized geometry), demonstrating the capability of including algorithms from other sources, and NISP_Win may render the instrument in a virtual reality file. Results are shown for two instruments under development.

Paper Details

Date Published: 21 October 2004
PDF: 15 pages
Proc. SPIE 5536, Advances in Computational Methods for X-Ray and Neutron Optics, (21 October 2004); doi: 10.1117/12.559817
Show Author Affiliations
Philip A. Seeger, Los Alamos National Lab. (United States)
Luke L. Daemen, Los Alamos National Lab. (United States)

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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