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<div class="tex2jax_process"><p><span><span><span><span>NCNR is planning for a one year outage to install an upgraded cold neutron source</span> doubling the flux at long wavelengths (<span>\(\lambda\)</span> &gt; 8 Å).&nbsp; This new cold source, which will be liquid D<sub>2</sub> rather than liquid H<sub>2</sub>, will improve the performance of most instruments in the neutron guide hall.&nbsp; <a href="https://ncnr.nist.gov/Upgrade_Briefing_20210226.mp4">A webinar on this activity&nbsp;can be viewed here</a>.</span></span></span></p>
<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/2020/04/07/Cold%20Source.png?itok=HkqebvYY" data-media-id="577521">
<img alt="Cold Source" height="341" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2020/04/07/Cold%20Source.png?itok=f9Rg323z" typeof="foaf:Image" width="480">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<p>&nbsp;<span><span><span>The NCNR will take advantage of this opportunity to upgrade neutron guides, <a href="https://www.nist.gov/ncnr/installation-upgraded-cold-source/new-ng-5">NG5</a>, <a href="https://www.nist.gov/ncnr/installation-upgraded-cold-source/new-ng-6">NG6</a>, and <a href="https://www.nist.gov/ncnr/new-ng-7">NG7</a>.&nbsp; The current guides were installed 30 years ago and have <sup>58</sup>Ni coatings which were state-of-the-art at the time.&nbsp; They will be replaced by modern supermirror guides.&nbsp; To minimize the length of the reactor outage, <span>we will remove portions of <a href="https://www.nist.gov/ncnr/installation-upgraded-cold-source/new-ng-5">NG-5</a>, <a href="https://www.nist.gov/ncnr/installation-upgraded-cold-source/new-ng-6">NG-6</a>, and <a href="https://www.nist.gov/ncnr/new-ng-7">NG-7</a> in the guide hall prior to the beginning of the reactor outage</span>.&nbsp; We expect these guides to be closed for the last time ahead of the reactor outage, after which SPINS and the horizontal sample reflectometer on <a href="https://www.nist.gov/ncnr/new-ng-7">NG-7</a> will be permanently retired.</span></span></span></p>
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<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/04/07/Guide%20Hall.png?itok=bPA4LVFP" data-media-id="577526">
<img alt="Guide Hall" height="278" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2020/04/07/Guide%20Hall.png?itok=ikpJng0O" typeof="foaf:Image" width="480">
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<p>​<span><span><span>The reactor will restart when the new NG5, NG6, and NG7, have been installed through the </span>confinement<span> wall (D100).&nbsp; However, the new guides will not have been installed in the guide hall.&nbsp; <span>We expect that it will take up to a year to replace NG-7 (which serves one of our 30 m SANS instruments) back into operation.&nbsp; NG-5 and NG-6 will be completed sometime after that.</span></span></span></span></p>
<p><span><span><span>The new NG5, NG6, and NG7 will be designed to enhance the performance of instruments on these guides.&nbsp;</span></span></span></p>
<ul>
<li><span><span><span><span><a href="https://www.nist.gov/ncnr/new-ng-7">NG-7</a>:</span>&nbsp; Will now serve an upgraded \(\alpha\)-\(\gamma\) station along with the two interferometers, the test station, and a 30 m SANS instrument.</span></span></span></li>
<li><span><span><span><span><a href="https://www.nist.gov/ncnr/installation-upgraded-cold-source/new-ng-6">NG-6</a>:</span> Will now be curved to serve a significantly enhanced cold neutron imaging station as well as a side position with a monochromatic beam.</span></span></span></li>
<li><span><span><span><span><a href="https://www.nist.gov/ncnr/installation-upgraded-cold-source/new-ng-5">NG-5</a>:</span> Will be designed to serve a substantially improved cold neutron triple axis spectrometer at the end of the guide.</span></span></span></li>
</ul>
<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/2023/01/27/cold.jpg?itok=FwBcoBnc" data-media-id="662566">
<img alt="NCNR cold source upgrade schedule" height="461" loading="lazy" src="/sites/default/files/styles/960_x_960_limit/public/images/2023/01/27/cold.jpg?itok=oINPXmtf" typeof="foaf:Image" width="960">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<p>View a presentation giving a&nbsp;<a href="https://www.ncnr.nist.gov/Adler_ACNS.mp4">summary of the outage activities and upgrades</a> around the new cold source given by Daniel Adler to the ACNS meeting in July&nbsp;2020.</p>
<p><span><span><span>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</span></span></span></p>
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Created April 7, 2020, Updated February 10, 2023
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