Introducing the inverted-geometry time-of-flight backscattering instrument, MARS at SINQ

Abstract

The design and performance of the new inverted-geometry time-of-flight backscattering instrument, Mica Analyzer high Resolution inverted time-of-flight backscattering Spectrometer (MARS) located at SINQ, at the Paul Scherrer Institut, is described. The spectrometer boasts high resolution over a large neutron energy transfer range, reaching 1 μeV at the elastic line. The foremost distinguishing feature is the moveable analyzer banks, allowing resolution matching between the primary and secondary instrument, thus achieving optimal intensity. A wide Q-range is obtained by selecting different mica analyzer reflections, rendering MARS a highly versatile spectrometer with applications foreseen across many branches of the physical and biological sciences.

Keywords:

• Backscattering
• High-resolution
• Quasielastic
• Inelastic

Acknowledgements

We would like to extend our gratitude to the superb body of technical staff here at the Paul Scherrer Institut, who actually built the instrument.