This instrument is operational .

A side perspective view of the MARI spectrometer

MARI spectrometer
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Mari is a chopper spectrometer with continuous detector bank coverage ranging from 3° to 134° degrees.

Mari is a uniquely versatile instrument and has contributed seminal work in fields such as quantum-fluids, the dynamics of disordered materials and low-dimensional magnetism. It is also used for studies of biological and polymeric materials, catalysts, thermo-electric materials, geological samples, high-temperature superconductors and liquid dynamics.

A large fraction of the time on Mari is spent studying magnetic systems. When Mari was first built it was realised that its detector geometry would be ideal for studies of low dimensional magnetic systems where a large numbers of detectors could be added together to produce good statistics. However, recently Mari and its sister spectrometer, Het, have started to look at three dimensional magnetic systems.

The Marispectrometer was funded by the Japanese Ministry of Education, Science and Culture (Monbusho) as part of the UK-Japan Collaboration on neutron scattering. This collaboration, initiated in 1986, was the creation of the late Professor Yoshikazu Ishikawa. The spectrometer is named after Professor Ishikawa's daughter, Mari. The Japanese Symbol for Mari also happens to be the Japanese for truth.

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