918 lines
84 KiB
Text
918 lines
84 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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<head>
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<div class="align-right nist-image--lightbox nist-image" data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/07/07/NSF.jpg?itok=A5F9tnXW" data-media-id="583991">
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<p>A new neutron spin echo instrument is being developed at NIST in collaboration with the University of Delaware’s <a href="https://cns.che.udel.edu/">Center for Neutron Science</a>, led by <a href="https://www.che.udel.edu/people/faculty/wagnernj/">Prof. Norm Wagner</a>. It is funded by the <a href="https://www.nsf.gov/funding/pgm_summ.jsp?pims_id=505602">Mid-scale Research Infrastructure</a> program, one of <a href="https://www.nsf.gov/news/special_reports/big_ideas/">NSF’s 10 Big Ideas</a>. The instrument is essentially a replica of the new <a href="https://mlz-garching.de/j-nse">J-NSE Phoenix</a> instrument built by <a href="https://www.fz-juelich.de/jcns/EN/Home/home_node.html">JCNS</a> and located at the <a href="https://mlz-garching.de/englisch">MLZ</a> in Garching, Germany.</p><p>The new instrument employs optimally designed superconducting precession coils (OSCPCs), increasing the maximum Fourier time by 2.5x. This enables the use of shorter wavelengths with significantly higher intensities for a given time window and thus increases the data acquisition rate by roughly an order of magnitude. Combining the new design with several instrument elements optimized for long wavelength operation, we expect to achieve a Fourier time of 300 ns routinely, possibly reaching 700 ns for strongly scattering samples. The extended accessible time scale will expand the opportunities to study various material systems, especially in soft matter. Further improvements are expected with the increased flux provided by the upcoming cold source.</p>
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<figure class=" align-center nist-image--lightbox nist-image" role="group">
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<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/04/10/NG-A.jpg?itok=xNqMr3xR" data-media-id="577916">
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<img alt="NG-A" height="186" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2020/04/10/NG-A.jpg?itok=as0Ly-fS" typeof="foaf:Image" width="480">
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<figcaption class="nist-image__caption">Figure 1</figcaption>
|
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</figure>
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<p class="MsoNormal">Figure 1. a) The old NSE capable time and space domain is presented in orange, while the extended area shown in blue results from the upgrade project, with a possibility of reaching further to the dashed area for strongly scattered samples. b) The 2x flux gain by the D2 cold source at longer wavelengths, λ > 7 Å, and the optimally designed superconducting precession coils increase the Fourier time corresponding to each routinely used wavelength.</p><p class="MsoNormal">The OSCPCs arrived at NCNR in early Nov 2022 and passed inspection and site-acceptance tests. These tests ensured that the superconductor coils work correctly below the superconducting transition temperature of ≈9K. Installation of the cryo-compressors and warm zone components for both OSCPCs was completed in early July 2023, followed by successful leak tests which involved circulating water through the correction coils. In August 2023, the instrument was in its final location at NG-A. The epoxy floor was completed in early December 2023, allowing the second arm of the spectrometer to swing up to its maximum scattering angle of 95°.</p>
|
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<figure class=" nist-image--lightbox nist-image" role="group">
|
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<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2024/01/26/Fig2_NSE%20Updates_Jan2024.jpg?itok=ZA61kNAa" data-media-id="699326">
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<img alt="Primary OSCPC" height="359" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2024/01/26/Fig2_NSE%20Updates_Jan2024.jpg?itok=746_TW5j" typeof="foaf:Image" width="480">
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<figcaption class="nist-image__caption">Figure 2</figcaption>
|
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</figure>
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<p>Figure 2. The primary optimized superconducting precession coil (OSCPC) sitting on its stationary carriage is at the final spot. The installation of warm zones for both OSCPCs is completed. The Pythagoras coil (bottom left) is one of the correction elements of the warm zone inside the OSCPC. Each superconducting coil is cooled by two large cryocoolers (bottom middle), which are ready in place. The sample stage was installed on the epoxy, while aluminum panels were added on top of the epoxy floor for the secondary precession coil, analyzer, and detector (bottom right) since they are subject to swing up to 95 degrees of angle during operation.</p><p>Along with OSCPCs, several other critical components were fabricated, passed factory and site-acceptance tests, and were delivered to NCNR. These components include a neutron velocity selector (NVS) and its exchange table, a polarizer and its exchange table, an updated position-sensitive detector (PSD), warm zone components including Pythagoras coils and other correction coils mounted inside OSCPCs, new support structures, and an updated power supply system. While the new NVS and the single-V cavity polarizer are designed to work effectively with long neutron wavelengths, the old NVS and the double-V cavity polarizer will still be in use for shorter neutron wavelength applications. The new <sup>3</sup>He PSD consists of an array of tube detectors with improved maximum count rate and sensitivity over long neutron wavelengths. All these elements have been installed in their final configuration.</p>
|
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<figure class=" align-center nist-image--lightbox nist-image" role="group">
|
||
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2023/08/09/Figure3.jpg?itok=Au6JshMi" data-media-id="683116">
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||
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||
<img alt="Neutron velocity selectors, control panel, correction coil, and polarizer station" height="480" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2023/08/09/Figure3.jpg?itok=OEDyOLO0" typeof="foaf:Image" width="420">
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<figcaption class="nist-image__caption">Figure 3</figcaption>
|
||
</figure>
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||
|
||
<p>Figure 3. The top left picture shows two neutron velocity selectors (NVSs) sitting on a newly fabricated exchange table, and their control panel is at the bottom left. The old NVS (bigger one) will be reused for short wavelengths, while the new NVS (smaller one) is designed for longer wavelengths. The top right picture is the state-of-the-art Pythagoras correction coil shown in Fig. 2 when mounted inside OSCPC. The bottom right is an exchangeable polarizer station, which hosts double-V (reused) and single-V cavity (new) polarizers for short and long wavelengths.</p><p>The new NSE instrument is in the cold commissioning phase, and most components were confirmed to be functional. Apart from the platform for the sample area, which is expected to be delivered to NIST in early 2025, the instrument is ready for hot commissioning.</p><p>Further information and updates on the project’s progress and the upcoming workshop can be found on the Center for Neutron Science <a href="https://cns.che.udel.edu/neutron-spin-echo-for-the-nation/">website</a> and social media on <a href="https://twitter.com/NSE_Upgrade">Twitter</a>.</p>
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<div class="text-italic font-sans-2xs">
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Created April 8, 2020, Updated December 12, 2024
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<a href="/ncnr/cold-source-installation-and-guide-upgrade/new-ng-5" rel="prev" title="Go to previous page" class="nist-booknav__link"><b>‹</b> The new NG-5</a>
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