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MACS is a Multi Axis Crystal Spectrometer that is
under construction at the NIST Center for Neutron Research. This third
generation cold neutron spectrometer will provide ultra high sensitivity
access to dynamic correlations in condensed matter on length scales from 0.1 nm
to 50 nm and energy scales from 0.05 meV to 20 meV. The project is funded
jointly by the NIST Center for Neutron Research, the National Science
Foundation, and the Johns Hopkins University.
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MACS detector system.
The detection system consist of 20 vertically focusing Double
Crystal Analyzers surrounding the sample and separated by 8 degrees in
the horizontal scattering plane. There will be two detectors in each of
the 20 channels. The so-called diffraction detector that views the
sample directly is placed behind the first analyzer. The spectroscopic
detector views the second analyzer blade and so only detects neutrons
that satisfy the DXAL Bragg condition.
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