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<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/%CE%A0_polarizability_Meeting_Mar_9,_2022#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p> ____________________________________</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Minutes, Π polarizability Meeting, Mar. 9, 2022</span></h2>
<p>Attending: Alex Austregesilo, Mark Dalton, Albert Fabrizi,
Sergey Furletov, David Hornidge, Mark Ito (chair), Nikhil
Kalra, Ilya Larin, Rory Miskimen, Andrew Schick, Simon
Taylor, Beni Zihlmann
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://jlab-org.zoomgov.com/rec/share/P1HYtIgWpNW3M3Nr4Ukj3YADfLkTxiHOONTyB2rYc4JNQKQcJymGJGxCErom-3Ob.xlVJquRn55SKlJDk">recording
of this meeting</a> (Passcode: 2ttBdP*.) on the ZoomGov
website.
</p>
<h3><span class="mw-headline" id="Action_Items_2">Action Items</span></h3>
<h4><span class="mw-headline"
id="Check_with_Sasha_on_steps_for_.22replay.22">Check with
Sasha on steps for "replay"</span></h4>
<ul>
<li> Ilya, as previously reported, has looked at the random
trigger data Sascha Somov took at the end of the SRC runs.
He sees rates about 5% above what was expected from
previous tests.</li>
<li> Sergey reported that Sascha has been unable to do
further tests on the TOF trigger due to interference with
the on-going CDC cosmic tests. Sergey will confirm this
and see if there are any pieces of the work that can
proceed despite the cosmic run.</li>
</ul>
<h4><span class="mw-headline"
id="Decide_on_any_work_to_be_done_on_the_TAC">Decide on
any work to be done on the TAC</span></h4>
<p>Rory reviewed the <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/talks/2022/Status%20of%20the%20TAC%20in%20Hall%20D.pdf">email
exchange</a> he had with Sascha on the TAC. We agreed that
it might be better to use the CCAL as a total absorption
counter since that was the last system that was used
successfully in the Hall, but mechanical interference with
the muon chambers is an issue. One idea would be to mount
the CCAL on the stand for the TAC. We did not know if this
is anywhere near feasible or not.
</p>
<p>Rory will ask Tim if he is having a CPP Design meeting
tomorrow (Thursday). If so we can discuss this idea there.
</p>
<h4><span class="mw-headline" id="Other_Action_Items">Other
Action Items</span></h4>
<ul>
<li> Work with Justin to create the appropriate translation
tables for the scalers (Beni). No progress to report.</li>
<li> Check with Chris about sensor voltage for the LV
supplies (Beni). No progress to report.</li>
<li> Update the database with the microscope translation
table (Elton). No progress reported.</li>
</ul>
<h3><span class="mw-headline"
id="Previous_CPP_meeting:_Mar_2.2C_2022">Previous CPP
meeting: Mar 2, 2022</span></h3>
<p>We looked over the <a
href="https://halldweb.jlab.org/wiki/index.php/%CE%A0_polarizability_Meeting_Mar_2,_2022"
title="Π polarizability Meeting Mar 2, 2022">minutes</a>
from last week's meeting.
</p>
<p>Mark mentioned that he is in the process of putting
together a new version set with the changes that Simon has
put in for the FWMPCs, including the adjustment Richard
Jones requested for backward compatibility.
</p>
<p>Rory characterized Mark I. showing up for only the last few
minutes of the meeting as a "tactical error." Mark
concurred.
</p>
<h3><span class="mw-headline"
id="Previous_CPP_Software_meeting">Previous CPP Software
meeting</span></h3>
<p>We reviewed the <a
href="https://halldweb.jlab.org/wiki/index.php/%CE%A0_polarizability_Software_Meeting_Mar_3,_2022"
title="Π polarizability Software Meeting Mar 3, 2022">minutes
from the meeting on March 3rd</a> without significant
comment.
</p>
<h3><span class="mw-headline" id="Announcements">Announcements</span></h3>
<p>Mark I. has a new dog. His name is Charlie. He announced
his presence at the meeting. (Charlie announced his presence
himself, that is.)
</p>
<h3><span class="mw-headline" id="Action_Items_3">Action Items</span></h3>
<p>We reviewed them earlier, remarks above.
</p>
<h3><span class="mw-headline" id="CPP_voltage_controls">CPP
voltage controls</span></h3>
<p>No report given.
</p>
<h3><span class="mw-headline"
id="Plan_for_diamond_simulations">Plan for diamond
simulations</span></h3>
<p>Richard will do the study based on data from the Canadian
light source. This will provide guidance for Hovanes Egiyan
about where good spots on the diamond might be.
</p>
<h3><span class="mw-headline" id="Software.2FCalibration">Software/Calibration</span></h3>
<p>No report given.
</p>
<h3><span class="mw-headline" id="MWPC_Testing">MWPC Testing</span></h3>
<p>Beni re-capped the cable situation.
</p>
<ol>
<li> Low-voltage cables: all ready to be installed.</li>
<li> High-voltage cables: cables ready to be installed.
Break-out box still needed. Chris Stanislav is working on
that.</li>
<li> Signal cables: only six on hand. The complete set was
due a month ago. The manufacturer reports that they
received the input materials two weeks ago. They are being
made now and should be delivered by the middle to end of
this month.</li>
</ol>
<p>In the mean time, the six cables can be moved from chamber
to chamber to look at noise levels in the Hall.
</p>
<h3><span class="mw-headline"
id="CPP_and_NPP_Experiment_Configuration">CPP and NPP
Experiment Configuration</span></h3>
<p>Mark I. reminded us to fill in relevant configuration
information on the <a
href="https://halldweb.jlab.org/wiki/index.php/CPP_and_NPP_Experiment_Configuration"
title="CPP and NPP Experiment Configuration">wiki page</a>.
</p>
<h3><span class="mw-headline" id="CPP-NPP_trigger">CPP-NPP
trigger</span></h3>
<p>Discussed earlier in the meeting.
</p>
<h3><span class="mw-headline" id="DAQ_and_Electronic_Setup">DAQ
and Electronic Setup</span></h3>
<p>Part of discussion on MWPC Testing, above.
</p>
<h3><span class="mw-headline"
id="FCAL_Readout_Re-Configuration">FCAL Readout
Re-Configuration</span></h3>
<p>Mark D. reported on an idea, proposed by proponents of
PrimEx, to do a gain-equization exercise on the FCAL. In
preparation for this they propose to reduce gains ab initio
on all PMTs to reduce the spread in gains as well as bring
lowest-gain PMTs off from their current settings at the
maximum voltage. To offset this change they prose halving
the voltage range covered by the FADCs on all channels from
2 V to 1 V. The proposal is to do this during the CPP run
since there will not be time to go through the exercise
during PrimEx (which follows directly after CPP).
</p>
<p>Mark D. described an alternate plan where the lowest-gain
PMTs get replaced so that those channels can be run at a
voltage less than the maximum.
</p>
<p>Those at the meeting were not enthusiastic about performing
such a large change (corresponding the PrimEx-proposed plan)
in the middle of the already short CPP/NPP running. In
particular this would be a new configuration for the FCAL
energy trigger (which is based on the FADCs) when the NPP
experiment depends on it critically.
</p>
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