Merlin has been in user operation since 2008. It was designed to be a high intensity, medium energy
resolution spectrometer that would complement the high-resolution MAPS spectrometer, and replace
the HET spectrometer. Merlin's design exploited recent advances in technology with a supermirror
guide to enhance flux, as well as 3 m long position-sensitive detectors in a vacuum, making it
ideal for the study of single crystals. The detector bank covers a massive \pi steradians of solid
angle with an angular range from -45 to 135 degrees in the horizontal plane, and \pm 30 degrees in
the vertical plane. This allows large swathes of Q,\omega space to be accessed in a single run.
Since 2014, Merlin has been running in event mode, and by using the new Gd chopper combined with a
disk chopper, it is able to run in repetition-rate multiplication (RRM) mode, allowing users to
simultaneously measure with several incident energies.
Parameters in boldface are required;
the others are optional.