983 lines
79 KiB
Text
983 lines
79 KiB
Text
<!DOCTYPE html>
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<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
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<h1 class="nist-page__title">BT-7 Double Focusing Triple-Axis Spectrometer</h1>
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<p><span> As part of the modernization of the thermal neutron spectrometers, a state-of-the-art thermal neutron instrument has been installed at the BT-7 thermal beam port. There is a choice of collimations in the reactor beam that bring neutrons onto a choice of PG(002) (or PG(004) over select energies) or Cu(220) 20 cm by 20 cm double-focusing monochromators. A velocity selector has recently been installed in the reactor beam to suppress unwanted neutrons and a PG filter is also available. The sample stage incorporates an</span> independent magnet axis in addition to the usual motorized sample orientation and rotation angles. The analyzer and detector system is housed in a single unit on air pads. The analyzer provides horizontal focusing capability, or it can use the crystal array coupled with a position-sensitive detector to allow the simultaneous collection of data over a range of (<strong>Q</strong><span>,E), or it can use a choice of different conventional collimators, all remotely and under computer control. The analyzer/detector system is designed</span> to be self-contained so that it can be easily interchanged with a different style of analyzer as new systems are developed. Guide fields are incorporated throughout the instrument to enable polarized beam operation with optically-pumped He<sup>3</sup><span> polarizers.</span></p><address> </address><p><span>BT-7 Instrument Publication: Please reference the following article in publications: <strong>Double Focusing Thermal Triple Axis Spectrometer at the NCNR, </strong>J. W. Lynn, Y. Chen, S. Chang, Y. Zhao, S. Chi, W. Ratcliff, II, B. G. Ueland, and R. W. Erwin, </span><a href="http://dx.doi.org/10.6028/jres.117.002"><span>Journal of Research of NIST<strong>117</strong>, 61-79 (2012)</span></a><span>.</span></p>
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Created December 19, 2018, Updated June 17, 2024
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