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<td>[New Logentry] TOF CAEN RF Timing Test</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Fri, 4 Nov 2016 13:55:01 -0400 (EDT)</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:pmatt@jlab.org">pmatt@jlab.org</a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:zihlmann@jlab.org">zihlmann@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:elton@jlab.org">elton@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>,
<a class="moz-txt-link-abbreviated" href="mailto:gen@jlab.org">gen@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:barbosa@jlab.org">barbosa@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:jastrzem@jlab.org">jastrzem@jlab.org</a>,
<a class="moz-txt-link-abbreviated" href="mailto:sdobbs@jlab.org">sdobbs@jlab.org</a></td>
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<article id="node-508847" class="node node-logentry article
ia-n clearfix" role="article">
<header class="node-header">
<h1 class="node-title"> <a moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3436009"
rel="bookmark">TOF CAEN RF Timing Test</a> </h1>
</header>
<div class="date-vitals">
<p class="author-datetime"> Lognumber <a
moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3436009"
class="lognumber" data-lognumber="3436009">3436009</a>.
Submitted by <a moz-do-not-send="true"
href="https://logbooks.jlab.org/user/pmatt">pmatt</a>
on <time datetime="2016-11-04T13:52:43-0400"
pubdate="pubdate">Fri, 11/04/2016 - 13:52</time>. </p>
<table class="field-vitals">
<tbody>
<tr>
<th>Logbooks: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/hdlog">HDLOG</a></td>
</tr>
<tr>
<th>Entry Makers: </th>
<td>pmatt</td>
</tr>
<tr>
<th>Attached Files: </th>
<td>
<div><span class="file"><img
moz-do-not-send="true" class="file-icon"
alt="PDF icon" title="application/pdf"
src="modules/file/icons/application-pdf.png"><a
moz-do-not-send="true"
href="https://logbooks.jlab.org/files/2016/11/3436009/DeltaTs_TOFRFCanvas.pdf"
type="application/pdf; length=214877"
title="DeltaTs_TOFRFCanvas.pdf">TOF RF
Delta-T Distros</a></span></div>
<div><span class="file"><img
moz-do-not-send="true" class="file-icon"
alt="PDF icon" title="application/pdf"
src="modules/file/icons/application-pdf.png"><a
moz-do-not-send="true"
href="https://logbooks.jlab.org/files/2016/11/3436009/DeltaTMeans_TOFRFCanvas.pdf"
type="application/pdf; length=14967"
title="DeltaTMeans_TOFRFCanvas.pdf">TOF RF
Delta-T Means</a></span></div>
<div><span class="file"><img
moz-do-not-send="true" class="file-icon"
alt="PDF icon" title="application/pdf"
src="modules/file/icons/application-pdf.png"><a
moz-do-not-send="true"
href="https://logbooks.jlab.org/files/2016/11/3436009/DeltaTSigmas_TOFRFCanvas.pdf"
type="application/pdf; length=14970"
title="DeltaTSigmas_TOFRFCanvas.pdf">TOF RF
Delta-T Sigmas</a></span></div>
<div><span class="file"><img
moz-do-not-send="true" class="file-icon"
alt="PDF icon" title="application/pdf"
src="modules/file/icons/application-pdf.png"><a
moz-do-not-send="true"
href="https://logbooks.jlab.org/files/2016/11/3436009/DeltaTSkewness_TOFRFCanvas.pdf"
type="application/pdf; length=14981"
title="DeltaTSkewness_TOFRFCanvas.pdf">TOF
RF Delta-T Skewness</a></span></div>
<div><span class="file"><img
moz-do-not-send="true" class="file-icon"
alt="PDF icon" title="application/pdf"
src="modules/file/icons/application-pdf.png"><a
moz-do-not-send="true"
href="https://logbooks.jlab.org/files/2016/11/3436009/DeltaTKurtosis_TOFRFCanvas.pdf"
type="application/pdf; length=14944"
title="DeltaTKurtosis_TOFRFCanvas.pdf">TOF
RF Delta-T Kurtosis (Tailedness)</a></span></div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="logentry node-content">
<p>I've tested the new constants downloaded to the CAEN
TOF crate for the on-board look-up tables for the timing
correction. This test was done with the main Hall-D DAQ
by looking at the RF signal: comparing the time of the
1st RF signal with subsequent RF signals, the 2nd RF
signal with subsequent RF signals, etc. These
distributions are lined up near zero by shifting them by
~2.004 ns * Prescale factor. The Delta-t distributions,
and their means, sigmas, skewness, and kurtosis are
attached. </p>
<p>These should be compared to the study done several
months ago at:<br>
<a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/RF_DeltaTs">https://halldweb.jlab.org/wiki/index.php/RF_DeltaTs</a></p>
<p>The resolution is significantly reduced: it was from 35
- 55 ps, but it is now reduced to 22 - 27 ps. Also, the
skewness has been reduced from a magnitude of up to 0.6
down to a magnitude of 0.06 (a factor of 10). This is a
significant improvement in the TOF timing.</p>
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