Abstract
IPNS has four neutron spectrometers: two chopper spectrometers, HRMECS and LRMECS, and two crystal-analyzer spectrometers, QENS and CHEX. At the outset, HRMECS, LRMECS, and QENS (preceded by CAS in the 1980s) were fully users-dedicated instruments. CHEX was an add-on and has been a prototype for pilot experiments and for further development. Over the years, steady incremental improvements have been made on these spectrometers. Recently, QENS and HRMECS have undergone substantial upgrade both in hardware and software. Here, we describe the design and operation of QENS and HRMECS and illustrate their scientific capabilities by selected examples. Other details concerning IPNS' spectrometers are given elsewhere [1].
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