https://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&feed=atom&action=history22 February 2008 - Revision history2024-03-28T15:22:05ZRevision history for this page on the wikiMediaWiki 1.24.1https://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7184&oldid=prevCmeyer: /* Drift time spectra */2008-02-22T15:37:13Z<p><span dir="auto"><span class="autocomment">Drift time spectra</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 15:37, 22 February 2008</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift2.jpg|thumb|none|400px|figure 4.2: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal) - here the cosmic rays went through the straws close to the endplate.]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift2.jpg|thumb|none|400px|figure 4.2: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal) - here the cosmic rays went through the straws close to the endplate.]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>There is a difference: there is a hard cut-off - it comes 200 ns too late but it is there. This might be due to a change of the wire position (straw moved or string tension decreased). After measuring the position of the straws it turned out that <del class="diffchange diffchange-inline">the lower layers (4) </del>were 4 mm below where they should be<del class="diffchange diffchange-inline">. That is </del>half the radius<del class="diffchange diffchange-inline">! The two upper </del>layers <del class="diffchange diffchange-inline">appeared not being sagged</del>. This is not understood because <del class="diffchange diffchange-inline">they also </del>show <del class="diffchange diffchange-inline">the same </del>behavior. The <del class="diffchange diffchange-inline">lower layer has </del>been moved up by adding support and we are taking data again.  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>There is a difference: there is a hard cut-off - it comes 200 ns too late but it is there. This might be due to a change of the wire position (straw moved or string tension decreased). After measuring the position of the straws it turned out that <ins class="diffchange diffchange-inline">several tubes </ins>were <ins class="diffchange diffchange-inline">up to </ins>4 mm below where they should be <ins class="diffchange diffchange-inline">(</ins>half the radius<ins class="diffchange diffchange-inline">). However, several </ins>layers <ins class="diffchange diffchange-inline">appear to have no sag</ins>. This is not understood because <ins class="diffchange diffchange-inline">all tubes seem to </ins>show <ins class="diffchange diffchange-inline">similar </ins>behavior. The <ins class="diffchange diffchange-inline">sagging tubes have </ins>been moved up by adding support and we are taking data again.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The spike in the beginning is still not understood + the the fact that the drift time spectra is now twice as long as it should be. So some parts on the to do list are now:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The spike in the beginning is still not understood + the the fact that the drift time spectra is now twice as long as it should be. So some parts on the to do list are now:</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* (double) Check timing of the fADCs  --> the timing is correct -> recheck GARFIELD simulation.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* (double) Check timing of the fADCs  --> the timing is correct -> recheck GARFIELD simulation.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* re-measure wire-tension</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* re-measure wire-tension <ins class="diffchange diffchange-inline">(The last time this was done was two years ago).</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* Perform a tube sag test with a full ring of 1.5 m long tubes</ins></div></td></tr>
</table>Cmeyerhttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7158&oldid=prevYvhaarle: /* Drift time spectra */2008-02-21T23:52:30Z<p><span dir="auto"><span class="autocomment">Drift time spectra</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 23:52, 21 February 2008</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The spike in the beginning is still not understood + the the fact that the drift time spectra is now twice as long as it should be. So some parts on the to do list are now:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The spike in the beginning is still not understood + the the fact that the drift time spectra is now twice as long as it should be. So some parts on the to do list are now:</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* (double) Check timing of the fADCs</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* (double) Check timing of the fADCs <ins class="diffchange diffchange-inline"> --> the timing is correct -> recheck GARFIELD simulation.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* re-measure wire-tension</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* re-measure wire-tension</div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7157&oldid=prevYvhaarle: /* Drift time spectra */2008-02-21T22:40:06Z<p><span dir="auto"><span class="autocomment">Drift time spectra</span></span></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 22:40, 21 February 2008</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 26:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift2.jpg|thumb|none|400px|figure 4.2: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal) - here the cosmic rays went through the straws close to the endplate.]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift2.jpg|thumb|none|400px|figure 4.2: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal) - here the cosmic rays went through the straws close to the endplate.]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>There is a difference: there is a hard cut-off - it comes 200 ns too late but it is there. This might be due to a change of the wire position (straw moved or string tension decreased). After measuring the position of the straws it turned out that the lower layers (4) were 4 mm below where they should be. That is half the radius! The two upper layers appeared not being sagged. This is not understood because they also show the same behavior. The lower layer has been moved up and we are taking data again.  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>There is a difference: there is a hard cut-off - it comes 200 ns too late but it is there. This might be due to a change of the wire position (straw moved or string tension decreased). After measuring the position of the straws it turned out that the lower layers (4) were 4 mm below where they should be. That is half the radius! The two upper layers appeared not being sagged. This is not understood because they also show the same behavior. The lower layer has been moved up <ins class="diffchange diffchange-inline">by adding support </ins>and we are taking data again.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The spike in the beginning is still not understood + the the fact that the drift time spectra is now twice as long as it should be. So some parts on the to do list are now:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The spike in the beginning is still not understood + the the fact that the drift time spectra is now twice as long as it should be. So some parts on the to do list are now:</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* (double) Check timing of the fADCs</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* (double) Check timing of the fADCs</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* re-measure wire-tension</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* re-measure wire-tension</div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7156&oldid=prevYvhaarle: /* Drift time spectra */2008-02-21T22:36:18Z<p><span dir="auto"><span class="autocomment">Drift time spectra</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 22:36, 21 February 2008</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 25:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>figure 4.1. This is shown in figure 4.2.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>figure 4.1. This is shown in figure 4.2.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift2.jpg|thumb|none|400px|figure 4.2: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal) - here the cosmic rays went through the straws close to the endplate.]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift2.jpg|thumb|none|400px|figure 4.2: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal) - here the cosmic rays went through the straws close to the endplate.]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">There is a difference: there is a hard cut-off - it comes 200 ns too late but it is there. This might be due to a change of the wire position (straw moved or string tension decreased). After measuring the position of the straws it turned out that the lower layers (4) were 4 mm below where they should be. That is half the radius! The two upper layers appeared not being sagged. This is not understood because they also show the same behavior. The lower layer has been moved up and we are taking data again. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">The spike in the beginning is still not understood + the the fact that the drift time spectra is now twice as long as it should be. So some parts on the to do list are now:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* (double) Check timing of the fADCs</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* re-measure wire-tension</ins></div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7154&oldid=prevYvhaarle: /* Drift time spectra */2008-02-21T22:25:57Z<p><span dir="auto"><span class="autocomment">Drift time spectra</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure 4.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis unit is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns. This more or less equals 2x the length of the cable between CDC and Shaper board. Those are most likely reflections.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure 4.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis unit is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns. This more or less equals 2x the length of the cable between CDC and Shaper board. Those are most likely reflections.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift1.jpg|thumb|none|400px|figure 4.1: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal)]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:drift1.jpg|thumb|none|400px|figure 4.1: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal)]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">All previous data was taken with cosmic rays going through the middle of the straws. Let's see what happens if we move the trigger scintillators to the end (or beginning) of the straws and remake </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">figure 4.1. This is shown in figure 4.2. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Image:drift2.jpg|thumb|none|400px|figure 4.2: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal) - here the cosmic rays went through the straws close to the endplate.]]</ins></div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7153&oldid=prevYvhaarle: /* Drift time spectra */2008-02-21T22:14:33Z<p><span dir="auto"><span class="autocomment">Drift time spectra</span></span></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 22:14, 21 February 2008</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure 4.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis unit is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns. This more or less equals 2x the length of the cable between CDC and Shaper board. Those are most likely reflections.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure 4.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis unit is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns. This more or less equals 2x the length of the cable between CDC and Shaper board. Those are most likely reflections.  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[Image:<del class="diffchange diffchange-inline">trigger</del>.jpg|thumb|none|400px|figure 4.1: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal)]]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[Image:<ins class="diffchange diffchange-inline">drift1</ins>.jpg|thumb|none|400px|figure 4.1: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal)]]</div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7151&oldid=prevYvhaarle: /* Drift time spectra */2008-02-21T22:11:27Z<p><span dir="auto"><span class="autocomment">Drift time spectra</span></span></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 22:11, 21 February 2008</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 19:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure 4.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis unit is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns. This more or less equals 2x the length of the cable between CDC and Shaper board. Those are most likely reflections.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure 4.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis unit is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns. This more or less equals 2x the length of the cable between CDC and Shaper board. Those are most likely reflections.  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[Image:trigger.jpg|thumb|none|400px|figure 4.1: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal)]]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">[</ins>[Image:trigger.jpg|thumb|none|400px|figure 4.1: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal)]]</div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7150&oldid=prevYvhaarle at 22:00, 21 February 20082008-02-21T22:00:19Z<p></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 22:00, 21 February 2008</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 18:</td>
<td colspan="2" class="diff-lineno">Line 18:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* There is no hard cut-off (edge of the straw), instead there is a long tail.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* There is no hard cut-off (edge of the straw), instead there is a long tail.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure <del class="diffchange diffchange-inline">3</del>.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>On The right side of figure <ins class="diffchange diffchange-inline">4</ins>.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis <ins class="diffchange diffchange-inline">unit </ins>is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns<ins class="diffchange diffchange-inline">. This more or less equals 2x the length of the cable between CDC and Shaper board. Those are most likely reflections. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">[Image:trigger.jpg|thumb|none|400px|figure 4.1: Left: drift time spectra of four channels; right: "drift time" spectra of the second signal (x-axis: ns after first signal)]]</ins></div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7149&oldid=prevYvhaarle at 21:54, 21 February 20082008-02-21T21:54:35Z<p></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 21:54, 21 February 2008</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 13:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Drift time spectra ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Drift time spectra ==</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">There is a problem with the (minimum) drift time spectra we have for a while. A GARFIELD simulation told us that the maximum drift time is 200 ns. In figure 4.1 on the left side 4 drift time spectra are shown (4 different channels). Two features are not understood:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* The sharp spike in the beginning </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* There is no hard cut-off (edge of the straw), instead there is a long tail.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">On The right side of figure 3.1 the drift time spectra of the signal coming after the first signal is plotted, the x-axis is ns after the first signal. There is a spike close to zero, these are actually not after pulses but probably belong to the first signal. There is also a peak (with a long tail) around 140 ns</ins></div></td></tr>
</table>Yvhaarlehttps://halldweb1.jlab.org/wiki/index.php?title=22_February_2008&diff=7148&oldid=prevYvhaarle at 20:10, 21 February 20082008-02-21T20:10:20Z<p></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 20:10, 21 February 2008</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 11:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:trigger.jpg|thumb|none|400px|figure 3.1: Histogram of trigger zero crossing time.]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:trigger.jpg|thumb|none|400px|figure 3.1: Histogram of trigger zero crossing time.]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>One can see too peaks that are 20 ns away from each other. The early peak contains almost 1/3 of the events. For now we do not worry too much because we have other problems.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>One can see too peaks that are 20 ns away from each other. The early peak contains almost 1/3 of the events. For now we do not worry too much because we have other problems.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Drift time spectra ==</ins></div></td></tr>
</table>Yvhaarle