Thermal neutron three-axis spectrometer

Simulated experiment

The animation shows the typical measuring strategy of a three axis spectrometer like IN8.

  • The monochromator selects a beam of neutrons in a narrow energy band.
  • The analyser is positioned to select a scattering direction (related to the momentum transfer, Q)
  • The energy of the neutrons which pass through the analyzer is determined by varying the angle of Bragg reflection from the analyzer
  • Each configuration of the spectrometer corresponds to a well-defined point in the (Q,ω) space.