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Even in the simplest cases, it is not straightforward to calculate the optics of a neutron guide system. This is illustrated, ''e.g.'', by considering multiple bounces in a neutron guide system, see problem  [[Exercises in Instrumentation#Problem: The neutron guide system|The neutron guide system]]. An accurate calculation of the properties of a complete and realistic neutron instrument becomes almost hopeless, and various other schemes must be applied.

One approach is the approximate, analytical calculations, made for determining the instrument resolution, which was performed around 1970 by Cooper and Nathans<ref name="coopernathans">M.J. Cooper and R. Nathans. ''Acta Cryst.'', vol. 23, p. 357 (1967).</ref> and Popovici<ref name="popovici">M. Popovici. ''Acta Cryst. A'', vol. 31, p. 507 (1975).</ref>. Calculations of this type have been extremely useful for many types of neutron instruments over the past decades, in particular triple-axis spectrometers, which are mostly used for elastic and inelastic measurements on single crystals, with high \(q\)-resolution. The triple-axis spectrometer was presented on the pages on [[Instrumentation]] in section [[Instrumentation#Instruments for inelastic neutron scattering|Instruments for inelastic neutron scattering]].

An alternative way to describe neutron instruments is to perform computer simulations of neutron motion. This can give essentially correct descriptions of neutron instrument models. The results are, however, subject to statistical sampling errors, always present in computer simulations (as in real experiments).

This page gives an introduction to Monte Carlo simulations and to existing Monte Carlo ray-tracing packages for neutron scattering. 

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{{TOC limit|3}}

= [[Introduction to the Monte Carlo technique]] =

{{:Introduction to the Monte Carlo technique}}


= [[Monte Carlo ray-tracing packages for neutrons]] =

{{:Monte Carlo ray-tracing packages for neutrons}}


= [[Techniques for neutron ray-tracing]] =

{{:Techniques for neutron ray-tracing}}


 

[[Inelastic magnetic scattering|←]]   Previous page: [[Inelastic magnetic scattering]] 
[[Exercises in Monte Carlo simulations|→]]   Exercises: [[Exercises in Monte Carlo simulations]] 
[[McStas simulation projects|→]]   Next page: [[McStas simulation projects]]

Monte Carlo simulation of neutron instrumentation - Revision history

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ucph>Tommy: Created page with "__NOEDITSECTION__ Even in the simplest cases, it is not straightforward to calculate the optics of a neutron guide system. This is illustrated, ''e.g.'',..."

ucph>Tommy: Created page with "NOEDITSECTION Even in the simplest cases, it is not straightforward to calculate the optics of a neutron guide system. This is illustrated, ''e.g.'',..."