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<p>People,</p>
<p>Please find the minutes <a moz-do-not-send="true" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_10,_2021#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p> ____________________________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span dir="auto">GlueX Start Counter Meeting, June 10, 2021, </span><span class="mw-headline" id="Minutes">Minutes</span></h2>
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<p>Present: Eugene Chudakov, Sean Dobbs, Mark Ito (chair),
Igal Jaegle, Simon Taylor, Tim Whitlatch, Beni Zihlmann
</p>
<p>There is <a rel="nofollow" class="external text" href="https://bluejeans.com/s/Az6OKsq8MyD/">a
recording of this meeting</a> on the BlueJeans site.
Use your JLab credentials to gain access.
</p>
<h3><span class="mw-headline" id="Review_of_minutes_from_the_last_meeting">Review of
minutes from the last meeting</span></h3>
<p>We went over the <a href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_18,_2021#Minutes" title="GlueX Start Counter Meeting, March 18, 2021">minutes
from the meeting on March 18</a>. In response to his
inquiries, Mark received the Purchase Requisition for
the Start Counter SiPMs from Sasha Somov and the specs
of the devices from Fernando Barbosa.
</p>
<h3><span class="mw-headline" id="New_mounting_design_for_Start_Counter">New
mounting design for Start Counter</span></h3>
<p>Igal presented an idea for mounting a new μRWELL
detector outside the scattering chamber but inside the
start counter to give better spatial resolution near the
event vertex. He has been working with Simon Taylor,
Sean Dobbs, Sergey Furletov, Stuart Ferguson[?], and
Kondo Gnanvo. He focused on mechanical design
considerations in his presentation. The current
configuration of the start counter/target region would
not accommodate cables for the detector. Igal proposes
moving the start counter 15 cm downstream with respect
to the target to open up space for cable penetrations.
See <a href="https://halldweb.jlab.org/wiki/images/f/fc/Sc_meeting.pdf" class="internal" title="Sc meeting.pdf">his slides</a>
for the details.
</p>
<p>From the discussion:
</p>
<ul>
<li> The effect on start counter rates of the move needs
to be studied. We have scalar data for GlueX running
in the EPICS archive. A test might be necessary to
accurately assess the change. Simulation may give an
answer as well.</li>
<li> Tim pointed out that it might be possible to
lengthen the aluminum tube the connects holds the
start counter and connects it mechanically to the
target assembly. Igal pointed out that such an
extension would need slots for cable penetration.</li>
</ul>
<h3><span class="mw-headline" id="Start_Counter_Use_in_the_Upcoming_Run">Start
Counter Use in the Upcoming Run</span></h3>
<p>Beni pointed out that we need to find out if PrimEx
and/or SRC have any plans for using the start counter.
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