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nist-gov/www.nist.gov/ncnr/chrns-vsans-very-small-angle-neutron-scattering
Scott Williams 4063bef310 Initital commit.
2025-03-05 18:59:57 +00:00

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class="nist-block"
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<div class="text-with-summary">
<p>&nbsp;</p>
<figure class=" align-center nist-image" role="group">
<div>
<img alt="Center for High Resolution Neutron Scattering (CHRNS)" height="123" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2017/05/12/chrns-3-wide.png?itok=rQP-koRT" typeof="foaf:Image" width="480">
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<figcaption class="nist-image__caption">Maximizing access for the scientific community to transformative neutron scattering instrumentation</figcaption>
</figure>
<figure class=" align-right nist-image--lightbox nist-image" role="group">
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2018/10/01/vsans-fig1.png?itok=PltEYnLq" data-media-id="465061">
<img alt="VSANS Schematic" height="393" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2018/10/01/vsans-fig1.png?itok=n53NOMgy" typeof="foaf:Image" width="366">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<p>Sponsored by the National Science Foundation as part of the&nbsp;<a href="https://www.nist.gov/ncnr/chrns">Center for High Resolution Neutron Scattering</a>&nbsp;(CHRNS), this brand new 45 meter long Small-Angle Neutron Scattering (VSANS) instrument on neutron guide NG3 was put into operation in 2017.</p>
<p>The instrument has a number of design features to make it more versatile than the 30 m instruments:</p>
<ul>
<li>High Resolution detector</li>
<li>Converging beam collimation</li>
<li>Multiple detector arrays</li>
<li>Narrow or broad wavelength resolution</li>
</ul>
<p>For more information see&nbsp;<a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-design-features.html">Design Features</a></p>
</div>
</div>
<div
class="nist-block"
>
<h2
class="nist-block__title"
>Specifications/Capabilities</h2>
<div class="text-long"><table align="left">
<tbody>
<tr>
<td align="left"><strong>Q-range</strong></td>
<td align="left" colspan="3">0.002 nm<sup>-1</sup>&nbsp;to 10 nm<sup>-1</sup></td>
</tr>
<tr>
<td align="left"><strong>Size Regime</strong></td>
<td align="left" colspan="3">1 nm to 2,000 nm</td>
</tr>
<tr>
<td align="left"><strong>Source</strong></td>
<td align="left" colspan="3">Neutron Guide (NG-3), cross-section: 60 mm x 150 mm</td>
</tr>
<tr>
<td align="left">
<p><strong>Power Outlets</strong></p>
</td>
<td align="left" colspan="3">
<p>220V, 30A, 1-phase - Qty. 3</p>
<p>208V, 30A, 3-phase - Qty. 2</p>
<p>208V, 60A, 3-phase - Qty. 2</p>
<p>110V, 30A, 1-phase - Numerous UPS and non-UPS</p>
</td>
</tr>
</tbody>
</table>
<h3><a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-monochromator.html">Monochromator</a></h3>
<table align="left">
<tbody>
<tr>
<td align="left">&nbsp;</td>
<td align="center">Velocity selector</td>
<td align="center">Mirror</td>
<td align="center">HOPG</td>
</tr>
<tr>
<td align="left"><strong>Wavelength Range</strong></td>
<td align="center">4.5 Å to 12 Å</td>
<td align="center">5.3 Å</td>
<td align="center">4 Å to 6 Å</td>
</tr>
<tr>
<td align="left"><strong>Wavelength<br>
Resolution (fwhm)</strong></td>
<td align="center">12 %</td>
<td align="center">~ 40%</td>
<td align="center">1%</td>
</tr>
</tbody>
</table>
<h3><a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-collimation.html">Collimation</a></h3>
<table align="left">
<tbody>
<tr>
<td align="left"><strong>Source-to-Sample<br>
Distance</strong></td>
<td align="left" colspan="3">4 m to 22 m in 2 m steps</td>
</tr>
<tr>
<td align="left"><strong>Collimation Types</strong></td>
<td align="left" colspan="3">Circular Pinhole, Multiple converging beams or Narrow slits</td>
</tr>
<tr>
<td align="left"><strong>Sample Size</strong></td>
<td align="left" colspan="3">5 mm diameter to 36 mm x 72 mm</td>
</tr>
<tr>
<td align="left" rowspan="2"><strong>Sample-to-Detector Distance</strong></td>
<td align="center">Front</td>
<td align="center">Middle</td>
<td align="center">Rear Carriage</td>
</tr>
<tr>
<td align="center">0.6 m to 10 m</td>
<td align="center">2.5 m to 18 m</td>
<td align="center">10 m to 22 m</td>
</tr>
</tbody>
</table>
<h3><a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-detectors.html">Detectors</a></h3>
<table align="left">
<tbody>
<tr>
<td align="left">&nbsp;</td>
<td align="center">Front</td>
<td align="center">Middle</td>
<td align="center">Rear Carriage</td>
</tr>
<tr>
<td align="left"><strong>Type</strong></td>
<td align="center">He(3) tubes</td>
<td align="center">He(3) tubes</td>
<td align="center">Scintillator + CCD</td>
</tr>
<tr>
<td align="left"><strong>Resolution</strong></td>
<td align="center">8 mm</td>
<td align="center">8 mm</td>
<td align="center">0.2 mm</td>
</tr>
<tr>
<td align="left"><strong>#Panels</strong></td>
<td align="center">4</td>
<td align="center">4</td>
<td align="center">1</td>
</tr>
<tr>
<td align="left"><strong>Size</strong></td>
<td align="center" colspan="2">2 x 380 mm wide x 1000 mm tall<br>
2 x 500 mm wide x 380 mm tall</td>
<td align="center">220 mm wide<br>
500 mm ta</td>
</tr>
</tbody>
</table></div>
</div>
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<a class="usa-button usa-button--primary-lighter" href="https://ncnr.nist.gov/ncnrdata/view/vsans/vsans_viewer.html">Live data</a>
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<ul>
<li>
<a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-design-features.html">Design Features</a>
</li>
<li>
<a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-monochromator.html">Monochromator</a>
</li>
<li>
<a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-collimation.html">Collimation</a>
</li>
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<a href="https://ncnr.nist.gov/equipment/msnew/ncnr/vsans-detectors.html">Detectors</a>
</li>
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>Experiment Planning</h2>
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<ul>
<li>
<a href="https://www.ncnr.nist.gov/resources/activation/">Activation and SLD Calculator</a>
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<li>
<a href="https://www.nist.gov/ncnr/obtaining-instrument-time">Obtaining Beam Time</a>
</li>
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<a href="http://nicedata.ncnr.nist.gov/niceweb/nicejs/VCALC/">VSANS Calculator (internal link)</a>
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<a href="/ncnr/sample-environment/sans-equipment">SANS Sample Environment and Equipment</a>
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<div class="nist-field__item"><a href="https://www.ncnr.nist.gov/publications/VSANS_pubs.html">VSANS Publications</a></div>
<div class="nist-field__item"><a href="https://www.nist.gov/ncnr/chrns">CHRNS</a></div>
<div class="nist-field__item"><a href="https://www.nist.gov/ncnr/neutron-instruments/small-angle-neutron-scattering-sans">Small Angle Neutron Research</a></div>
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<a href="/ncnr/data-reduction-analysis/sans-software">Data Reduction Using IGOR</a>
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<a href="http://sasview.org/">Data Analysis Using SasView</a>
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Created October 1, 2018, Updated June 20, 2023
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