Abstract
The University of Wisconsin-Madison Physical Sciences Laboratory (PSL) has designed and built two new types of double crystal monochromator (DCM): the Compact DCM and the Broomstick DCM. The Compact DCM has a single rotational stage and features a frame footprint only 0.74 m by 0.84 m, with a distance of only 0.35 m from beam centerline to the back of the instrument. It features full frontal access to the crystals without the need for a track system. The instrument is UHV-compatible by virtue of its all-metal construction and features motorized in-vacuum adjustments using bellows-sealed drive motors. The Broomstick DCM uses a patented mechanism which combines a cotangent generator with a pair of unique half-angle mechanisms. An external linear drive is the only input required to scan the monochromator; fine angular adjustments are made via PZT or manually. We present the final design of both DCMs and results from their performance tests.
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