Thermal neutron three-axis spectrometer

A general view of the instrument

Here IN8 is shown in its advanced configuration (IMPS), a multiplexed spectrometer consisting of a multi-analyser and a position-sensitive detector (PSD). It can also be used in a more classical configuration: mono-analyser and mono-detector.

The multiplexed spectrometer allows to measure nine different (Q,ω) points simultaneously by using a multiblade analyser consisting in nine crystal blades of plastically-bent Ge111 together with a two-dimensional PSD consisting in 54 He-filled tubes of 9 mm diameter.