Abstract
An acceptance diagram is a convenient and instructive way to represent spatial/angular neutron distributions within a neutron scattering instrument. In complicated systems, ray-tracing is used to calculate acceptance diagrams whereas in simple systems an analytical approach is appropriate. In the latter case, the action of a device such as a collimator or reflecting guide corresponds to one or more rather simple operations on the entrance acceptance diagram. Acceptance diagrams can also be used to investigate the behavior of devices such as focusing monochromators and velocity selectors.
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