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nist-gov/www.nist.gov/ncnr/multi-purpose-test-station-phades
Scott Williams 4063bef310 Initital commit.
2025-03-05 18:59:57 +00:00

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<h1 class="nist-page__title">Multi-Purpose Test Station - PHADES</h1>
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<p>PHADES (Polarized <sup>3</sup>He and Detector Experiment Station) is typically used for the testing of <sup>3</sup>He and related optics, detector optimization, and crystal alignment. A pyrolytic graphite monochromator set at a take-off angle of 75 degrees produces a monochromatic beam of <strong>4.1001(5) \({\unicode{x212B}}\)</strong> with fixed energy of <strong>4.8662(6) meV</strong>. Flux is relatively low at <strong>2 x 10<sup>6</sup>&nbsp;\(\frac{n}{cm^2s}\)</strong>. The vertical divergence of the neutron beam is also small at about 1 degree. The instrument is simply designed, yet highly versatile. It's primary uses are crystal alignment, 3He neutron spin filter testing/development, and detector testing/development.<br>
<br>
A series of collimators are available for use. Located at the beam exit, a 25 cm by 75 cm optical table of variable height may be used to support loads up to 100 kg. A second pyrolytic graphite crystal is available for use as an analyzer. Optional removal of the optical table combined with translation of the secondary spectrometer of over 1 m allows large sample environment equipment to be accommodated. Samples are typically mounted on a standard Huber goniometer with ± 22 degree tilt and ± 10 mm translation. Beam to sample heights are 6 inches (152 mm) and 2.75 inches (70 mm) from the Huber base.</p>
<p>A pencil detector (A4) travels from <strong>-7 degrees to +150 degrees</strong>, providing a maximum <strong>Q of 2.96 \({\unicode{x212B}}\)<sup>-1</sup></strong> and corresponding minimum sample reflection d-spacing of 2.123 \({\unicode{x212B}}\). Water and air lines are available to support sample environment equipment including electromagnets. Software for hkl crystal alignment is available.<br>
<br>
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