This instrument is operational,in user programme .

Toby Perring and Andrew Walters analysing data from the Maps in

Toby Perring (back) and Andrew Walters analysing data from the Maps instrument
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Maps has changed the way the neutron community thinks about inelastic neutron scattering.

Its huge array of position sensitive detectors has created a survey technique that is able to map vast areas of the Brillouin zone, making it possible to see the unexpected. It is able to reveal broad features which could easily be dismissed as background on a triple-axis machine.

The position sensitive detectors give near-continuous coverage over a large solid angle detector array in the forward direction. The pixel size in reciprocal space is significantly smaller than the resolution volume defined by the other instrumental contributions. In contrast, conventional detectors on Het and Mari integrate along one direction in reciprocal space, which overwhelms the intrinsic resolution in that direction. With Maps, there is complete freedom to construct scans along any direction in reciprocal space and project data onto any plane in reciprocal space.

Maps is optimised to measure high energy magnetic excitations in single crystals with varying energy resolution depending on choice of monochromating chopper.

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