Changeset 3553 for Tutorials/TOF Calibration
- Timestamp:
- Aug 3, 2018 10:51:26 PM (5 years ago)
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Tutorials/TOF Calibration/Calibration of a TOF powder diffractometer.htm
r3064 r3553 1153 1153 color:#365F91;mso-themecolor:accent1;mso-themeshade:191'><o:p></o:p></span></b></p> 1154 1154 1155 <P><B>A video version of this tutorial is available at 1156 <A href="https://anl.box.com/v/CalibrationofaTOFpowderdiffrac" target="_blank"> 1157 https://anl.box.com/v/CalibrationofaTOFpowderdiffrac</A></B></P> 1158 1155 1159 <p class=MsoNormal>In this tutorial, data collected on the SNS instrument 1156 1160 POWGEN, are used. The calibration process will use the fitted positions of all … … 1179 1183 text-underline:none'>start GSAS-II</span></a></span></u>.</p> 1180 1184 1181 <h 1>Part I. Determine the diffractometer constants</h1>1182 1183 <h 2>Step 1: Read in the data file</h2>1185 <h2>Part I. Determine the diffractometer constants</h2> 1186 1187 <h3>Step 1: Read in the data file</h3> 1184 1188 1185 1189 <p class=MsoNormal><span style='mso-spacerun:yes'> </span>Use the <b … … 1265 1269 style='mso-spacerun:yes'> </span><b style='mso-bidi-font-weight:normal'><o:p></o:p></b></p> 1266 1270 1267 <h 2><span style='mso-spacerun:yes'> </span>Step 2: Select peaks</h2>1271 <h3><span style='mso-spacerun:yes'> </span>Step 2: Select peaks</h3> 1268 1272 1269 1273 <p class=MsoNormal>Under the <b style='mso-bidi-font-weight:normal'><span … … 1305 1309 turned off.</p> 1306 1310 1307 <h 2>Step 3: Fit peaks</h2>1311 <h3>Step 3: Fit peaks</h3> 1308 1312 1309 1313 <p class=MsoNormal>To do the initial fit to the peaks, select the <b … … 1365 1369 v:shapes="Picture_x0020_40"><![endif]></span></p> 1366 1370 1367 <h 2>Step 4: Setup for calibration</h2>1371 <h3>Step 4: Setup for calibration</h3> 1368 1372 1369 1373 <p class=MsoNormal>Now that we have a reasonably well fit set of peak … … 1445 1449 <p class=MsoNormal>The calibration set up is now complete.</p> 1446 1450 1447 <h 2>Step 5: Calibration of diffractometer constants</h2>1451 <h3>Step 5: Calibration of diffractometer constants</h3> 1448 1452 1449 1453 <p class=MsoNormal>As we now have a set of reflection positions each properly … … 1602 1606 in the second part of the tutorial.</p> 1603 1607 1604 <h 1>Part II. Determine the instrument profile coefficients</h1>1608 <h2>Part II. Determine the instrument profile coefficients</h2> 1605 1609 1606 1610 <p class=MsoNormal>To best establish the profile coefficients one must have the … … 1610 1614 automatic procedure used above.</p> 1611 1615 1612 <h 2>Step 1. Change background</h2>1616 <h3>Step 1. Change background</h3> 1613 1617 1614 1618 <p class=MsoNormal>Select the <b style='mso-bidi-font-weight:normal'><span … … 1655 1659 v:shapes="Picture_x0020_51"><![endif]></span></p> 1656 1660 1657 <h 2>Step 2. Add more peaks to be fitted</h2>1661 <h3>Step 2. Add more peaks to be fitted</h3> 1658 1662 1659 1663 <p class=MsoNormal>Now zoom in on the right hand end of the pattern and select … … 1715 1719 project</span></b> from the main GSAS-II data tree window.</p> 1716 1720 1717 <h 2>Step 3. Refine profile coefficients</h2>1721 <h3>Step 3. Refine profile coefficients</h3> 1718 1722 1719 1723 <p class=MsoNormal>In this step you will be selecting some profile coefficients … … 2125 2129 curve to be about zero.</p> 2126 2130 2127 <h 2>Step 4. Check diffractometer constants </h2>2131 <h3>Step 4. Check diffractometer constants </h3> 2128 2132 2129 2133 <p class=MsoNormal>Since these calibration fits for profile coefficients varied … … 2179 2183 the main GSAS-II data tree menu).</p> 2180 2184 2181 <h 2>Step 5. Make instrument parameter file</h2>2185 <h3>Step 5. Make instrument parameter file</h3> 2182 2186 2183 2187 <p class=MsoNormal>We now have a fully calibrated instrument with
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