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Folks,<br>
<br>
Please find the minutes below and at<br>
<br>
<a class="moz-txt-link-freetext" href="https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_12,_2014#Minutes">https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_12,_2014#Minutes</a><br>
<br>
-- Mark<br>
_________________________________________<br>
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GlueX Start Counter Meeting, December 12, 2014<span
class="mw-headline" id="Minutes">, Minutes</span><br>
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<br>
Present:
<br>
<ul>
<li> <b>FIU</b>: Werner Boeglin, Mahmoud Kamel, Eric
Pooser
</li>
<li> <b>JLab</b>: Mark Ito, Beni Zihlmann
</li>
</ul>
<br>
<span class="mw-headline" id="Online_Monitoring_Histograms">Online
Monitoring Histograms</span><br>
<br>
Eric has been looking at the histograms to check status of
the start counter. He has some suggestions for histograms
that should be pulled out and put into the "highlights" list
for the online monitoring browser. He will send Justin an
email with the list.
<br>
<br>
<span class="mw-headline" id="Start_Counter_Studies">Start
Counter Studies</span><br>
<br>
Eric presented <a
href="https://halldweb1.jlab.org/talks/2014-4Q/ST_Update_Dec_12_2014.pdf"
class="external text" rel="nofollow">some slides</a> on
recent work to understand the data we are getting from the
start counter. We had extensive discussion on each slide.
The main themes were:
<br>
<ul>
<li> <b>Timing</b>. Now that he is using the reference
signal to the F1-TDCs, reasonable timing results were
shown.
</li>
<li> <b>Tracking Projections</b>. The intersection points
of charged tracks and the start counter are generally
sensible, but in detail present many anomalies.
</li>
</ul>
<br>
<span class="mw-headline" id="Calibration">Calibration</span><br>
<br>
We identified the front-burner issues:
<br>
<ul>
<li> better understanding of charged track projections
</li>
<li> counter-by-counter time offsets
</li>
</ul>
<br>
Precision on the latter will depend on the former.
<br>
<br>
<span class="mw-headline" id="The_Sector_2_Blues">The Sector
2 Blues</span><br>
<br>
Eric has noted consistently lower rates in sector 2 compared
to the others going back to the early days of the run. The
raw ADC and TDC spectra and occupancy do not explain it.
More investigation is needed.
<br>
<br>
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<pre class="moz-signature" cols="72">--
Mark M. Ito, Jefferson Lab, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295</pre>
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