11.7  Beam_spy: A beam analyzer

Note: Beam_spy has moved to the obsolete component category (see the Component Manual’s Obsolete chapter); the general-purpose Monitor_nD component (Monitors chapter) now covers this functionality and more. The description below is kept for reference.

This component is at the same time an Arm and a simple Monitor. It analyzes all neutrons reaching it, and computes statistics for the beam, as well as the intensity.

This component does not affect the neutron beam, and does not contain any propagation call. Thus it gets neutrons from the previous component in the instrument description, and should better be placed at the same position, with AT (0,0,0) RELATIVE PREVIOUS.