BT-4 Triple Axis Spectrometer

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the crane/george’s group)</li> <li>Check collimation</li> <li>Reatach bt-4 tas x-rail</li> <li>Attach the bt-4 tas monitor to power</li> <li>Repower the monitor (note the monitor is at 499.5 Volts, the detector is at 1276V)</li> </ol><h3>SETUP TAS</h3> <ol start="8"><li>Check that the correct monochromator is in:</li> </ol><blockquote><ol><li>d1h=25. This is necessary to give the monochromator room inside the drum to move in the z-direction. On the instrument rack immediately above the instrument computer, you will find the “goniometer drive” panel. This panel controls the x,y, and z motions of the monochromator. You will also find a table of values for each motion taped to this panel. Once you have executed step (a): <ol><li>Turn the “goniometer drive” panel knob to the desired direction to be moved (in this case “Z”)</li> <li>Place the “Drive” toggle in the direction of motion (+/-)</li> <li>Use “Slew” switch to drive the monochromator to the desired position</li> <li>Use the “Bump” switch when approaching the desired position to avoid overshooting, which can damage the monochromator</li> </ol></li> <li>Change the software value for the monochromator d-spacing using either dm=PG or dm=Cu in icp.</li> </ol></blockquote><ol start="9"><li>Verify xpeek is started</li> <li>Check the zero for the detector 2 theta</li> <li>Use fndlam to get the correct two theta for the monochromator and to find the wavelength</li> <li>Rock the monochromator at several energies that you plan to use:</li> </ol><blockquote><ol><li>fm 1,2,-.1,-2</li> <li>set 1= <value found></li> <li>pz</li> <li>record Z01 in the log book</li> <li>repeat for several energies and record E, Z1, a1</li> <li>exit ICP by typing “ex”</li> <li>cd /bt4/cfg</li> <li>vim ZCOEFFS.CFG</li> <li>change the values for “slope” and “intercept” (the numbers in front of !z1coeff1 and !z1coeff2)</li> <li>save the file</li> <li>set z1=-99 (which is flag to use a linear correction for the zero point vs theta)</li> <li>pz and verify that z1=-99</li> </ol></blockquote><ol start="13"><li>Align the analyzer</li> <li>Start prepare and icp in your directory</li> <li>Start statline</li> <li>Check which motors are free</li> </ol> </div> </div> </div> <aside class="nist-page__region nist-page__region--sidebar-second tablet-lg:grid-col-4"> <div> <div class="views-element-container nist-block nist-block--org" > <h2 class="nist-block__title" >NCNR Affiliations</h2> <div><div class="js-view-dom-id-d630a05a36996d2c402aa79ae0fb49e3a7e24b7bc8f8770f15fa03fe009b7eee"> <div class="nist-related-orgs"><div class="term-tree-list"> <ul class="term"><li><a href="/ncnr-affiliations/nist" class="unselected" hreflang="en">NIST</a></li><li><ul class="term"><li><a href="/ncnr-affiliations/ncnr-affiliations" class="unselected" hreflang="en">NCNR Affiliations</a></li><li><ul class="term"><li><a href="/ncnr-affiliations/nist/ncnr-affiliations/nist-center-neutron-research" class="selected" hreflang="en">NIST Center for Neutron Research</a></li></ul></li></ul></li></ul> </div> </div> </div> </div> </div> <div class="nist-block nist-block--contact" > <h2 class="nist-block__title" >Instrument Scientists</h2> <div class="nist-contact"> <ul class="nist-contact__items"> <li about="/people/william-d-ratcliff" class="nist-contact__item"> <div class="nist-contact__name"><a href="/people/william-d-ratcliff" title="View staff profile page">William D. Ratcliff</a></div> <div> <a href="mailto:william.ratcliff@nist.gov">william.ratcliff@nist.gov</a> </div> <div> (301) 975-4316 </div> </li> </ul> </div> </div> <div class="nist-block" > <div class="nist-field nist-field--label-hidden nist-field--link-list nist-field__items"> <div class="nist-field-item nist-date"><a href="https://www.ncnr.nist.gov/instrumentSchedule/ims_calendar.html?instruments=BT4">Current Schedule</a></div> <div class="nist-field-item nist-date"><a href="/ncnr/schedules/ncnr-schedule">Source Schedule</a></div> </div> </div> <div class="nist-block" > <h2 class="nist-block__title" >Instrument Details</h2> <div class="link-list"> <ul> <li> <a href="https://ncnr.nist.gov/publications/BT7_pubs.html">Thermal Triple Axis Publications</a> </li> <li> <a href="http://www.ncnr.nist.gov/staff/jeff/spurionquickstartm.html">Spurion Calculator</a> </li> <li> <a href="https://www.ncnr.nist.gov/resources/activation/">Sample Activation Calculator</a> </li> <li> <a href="http://tripleaxis.smallangles.net/">UB Matrix Calculator</a> </li> <li> <a href="http://reflectometry.org/tas/res/">Resolution Calculator</a> </li> <li> <a href="https://ncnr.nist.gov/ncnrdata/view/icpbrowser.html">ICP Data Browser</a> </li> <li> <a href="https://webster.ncnr.nist.gov/instruments/bt4tas/dailysummary.html">Daily Summary</a> </li> </ul> </div> </div> <div class="nist-block" > <h2 class="nist-block__title" >Experiment Planning</h2> <div class="link-list"> <ul> <li> <a href="/nist-center-neutron-research/sample-environment">Sample Environment</a> </li> <li> <a href="http://www.ncnr.nist.gov/userlab/shippingform.php">Non Radioactive Shipping Form</a> </li> <li> <a href="http://www.nist.gov/ncnr/upload/ShippingForm.pdf">Non Radioactive Shipping Form (PDF)</a> </li> </ul> </div> </div> <div class="nist-block" > <h2 class="nist-block__title" >Data Analysis</h2> <div class="link-list"> <ul> <li> <a href="/ncnr/dave-data-analysis-software">DAVE (Data Analysis Software)</a> </li> </ul> </div> </div> </div> </aside> </div> </div> <div class="grid-container"> <div class="nist-page__region nist-page__region--content-bottom" > <div class="nist-block" > <div class="text-italic font-sans-2xs"> Created August 1, 2019, Updated June 2, 2021 </div> </div> </div> </div> </section> </div> <div data-elastic-exclude>  <footer class="nist-footer padding-bottom-4"> <div class="grid-container nist-footer__info"> <div class="grid-row"> <div class="tablet:grid-col-6"> <div class="nist-footer__logo"> <a href="/" title="National Institute of Standards and Technology" rel="home"> <img class="nist-footer__logo-img" src="/libraries/nist-component-library/dist/img/logo/NIST-Logo-Brand-White.svg" alt="National Institute of Standards and Technology logo" width="300px" height="42px" /> </a> </div> <div class="nist-footer__contact"> <h3 class="nist-footer__contact-heading">HEADQUARTERS</h3> <address> 100 Bureau Drive<br> Gaithersburg, MD 20899<br> <a href="tel:301-975-2000">301-975-2000</a> </address> <p> <a href="mailto:do-webmaster@nist.gov">Webmaster</a> | <a href="https://www.nist.gov/about-nist/contact-us">Contact Us</a> | <a href="https://www.nist.gov/visit">Our Other Offices</a> </p> </div> </div> <div class="tablet:grid-col-6"> <div class="nist-footer__social-links"> <a class="nist-social nist-social--x-white" href=" https://x.com/NIST"> <span>X.com</span> </a> <a class="nist-social nist-social--facebook-white" href=" https://www.facebook.com/NIST"> <span>Facebook</span> </a> <a class="nist-social nist-social--linkedin-white" href=" https://www.linkedin.com/company/nist"> <span>LinkedIn</span> </a> <a class="nist-social nist-social--instagram-white" href=" https://www.instagram.com/nist/"> <span>Instagram</span> </a> <a class="nist-social nist-social--youtube-white" href=" https://www.youtube.com/NIST"> <span>YouTube</span> </a> <a class="nist-social nist-social--giphy-white" href=" https://giphy.com/nist"> <span>Giphy</span> </a> <a class="nist-social nist-social--rss-white" href=" https://www.nist.gov/news-events/nist-rss-feeds"> <span>RSS Feed</span> </a> <a class="nist-social nist-social--envelope-white" href=" https://public.govdelivery.com/accounts/USNIST/subscriber/new"> <span>Mailing List</span> </a> </div> <div class="nist-footer__feedback"> How are we doing? 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