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Instrument simulation
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Instrument simulation

There is increasing demand for computational tools to aid in the design of neutron-scattering instruments and experiments. The Monte-Carlo method is being used at ANSTO to assess optical components in our instruments and assist in the optimisation of guides and spectrometers.

The following Monte-Carlo simulation programs for Neutron Scattering and Synchrotron Radiation are available via the Internet:

  • McStas (Neutron - from Riso National Laboratory, Denmark)
  • NISP (Neutron - from Los Alamos National Laboratory, USA)
  • JBS  (Synchrotron - from the Elettra Synchrotron, Italy)

The following images are McStas Monte-Carlo simulations for the neutron beam coming through different apertures. In this case, the neutron beam divergence is a critical parameter in the design of a reflectometer at HIFAR.

McStas Reflectometer Simulations
McStas Reflectometer Simulations

  • 2mm x 25mm aperture
  • Detector at 750mm
  • Horizontal Divergence ~0.4°
  • Vertical Divergence < 0.05°
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