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</style><article id="node-408091" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3335300" rel="bookmark">Trigger studies for FDC calibration, summary</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3335300" class="lognumber" data-lognumber="3335300">3335300</a>. Submitted by <a href="https://logbooks.jlab.org/user/somov">somov</a> on <time datetime="2015-04-25T11:38:12-0400" pubdate="pubdate">Sat, 04/25/2015 - 11:38</time>. </p>
<p class="last-update">
Last updated on <time datetime="2015-04-25T11:39:13-0400" pubdate="pubdate">Sat, 04/25/2015 - 11:39</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hdlog">HDLOG</a></td></tr><tr><th>Entry Makers: </th><td>somov, pentchev</td></tr></table></div>
<div class="logentry node-content">
<p>Together with Lyubomir we were optimizing trigger for the FDC calibration, some data was taken over last night.</p>
<p>FCAL + TOF trigger<br />
--------------------------</p>
<p>FCAL E_total = 1500, E_cell = 65<br />
TOF trigger thr = 400</p>
<p>rate ~40 Hz for 50 nA (beam not stable)</p>
<p>Run 2900<br />
Run 2901<br />
Large fraction of good tracks according to Lyubomir.<br />
Trigger problems: not uniform occupancy for reconstructed tracks, area(s) with large occupancy observed<br />
(this feature is likely due to the TOF algorithm, fadc scalers for TOF don't indicate hot areas)</p>
<p>Check uniformity with FCAL trigger</p>
<p>Run 2901 (E = 1500, 65, rate ~900 Hz for 70 nA, beam not stable)<br />
Uniform distribution of reconstructed tracks, smaller fraction of tracks in the data sample.</p>
<p>FCAL + ST trigger<br />
------------------------<br />
FCAL: E=1500, 66<br />
ST thr = 50<br />
Rate ~80 Hz for 60 nA (beam not stable)</p>
<p>Seems to be a reasonably good trigger for the FDC calibration !</p>
<p>The fraction of events with reconstructed tracks is slightly smaller<br />
than that for the FCAL + TOF trigger, but uniform occupancy of reconstructed<br />
tracks was observed.</p>
<p>Run 2903</p>
<p>Configuration: FCAL_ST_m8.conf</p>
<p>Asked to take data during night.</p>
<p>Misc. problems:<br />
--------------------<br />
FCAL: one noisy channel showed up when the beam was on (was blocking the FCAL trigger - masked), Slot 15, Ch 13<br />
beam related (?) - Adesh is going to checked. This channel seemed to be Ok before.</p>
<p>DAQ: periodically disconnected coda components during RC state transitions; had to restart run couple of times<br />
(daq is stable when evth. is connected/configured)</p>
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