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<p>Folks,</p>
<p>Please find the notes below and at
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki-private/index.php/Hall_D_Staff_Meeting,_November_28,_2016">https://halldweb.jlab.org/wiki-private/index.php/Hall_D_Staff_Meeting,_November_28,_2016</a><br>
</p>
-- Mark<br>
___________________________<br>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Hall D Staff Meeting, November 28, 2016</span></h1>
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<p>Present: Alexander Austregesilo, Thomas Britton, Eugene
Chudakov, Mark Dalton, Alexandre Deur, Hovanes Egiyan,
Sergey Furletov, Mark Ito, David Lawrence, Paul Mattione,
Lubomir Pentchev, Elton Smith, Simon Taylor, Beni Zihlmann
</p>
<h2><span class="mw-headline" id="Eugene">Eugene</span></h2>
<ul>
<li> we have a budget until Dec. 9, after that we are hoping
for extension until March under a CR</li>
<li> all-hand meeting with Mont on Friday</li>
<li> position searches: no new news</li>
<li> running this year: Rolf supportive, situation clearer
in a week or so
<ul>
<li> Hall A has plans at 5 passes although one
experiment has been dropped</li>
<li> Alexandre: still possible to get separator cavity
fixed, two days to install, leak found but not fixed
at present</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="David">David</span></h2>
<ul>
<li> working on stabilizing rate from raid disk
<ul>
<li> next: try reformatting the disk, from zfs to
ext4[?]</li>
<li> also to try: configure as raid 0</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Sergey">Sergey</span></h2>
<ul>
<li> working with DAQ group to modify writing to eliminate
"provisional" trailer words which are immediately
overwritten, something to try</li>
<li> testing DAQ speed, getting 100 kHz for nearly empty
events
<ul>
<li> can write to disk at 1 GB/s</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Simon">Simon</span></h2>
<ul>
<li> re-doing multi photon survey with new REST data</li>
<li> working on event generator, π<sup>0</sup> and π<sup>0</sup>η</li>
<li> re-working cross section estimates for ω production</li>
</ul>
<h2><span class="mw-headline" id="Alex_A.">Alex A.</span></h2>
<ul>
<li> worked on REST production, took 2 week, produced 50 TB
of data</li>
<li> now working on Analysis Launch on these data
<ul>
<li> new plugin from Paul M. and Ryan Mitchel with all
exclusive final states
<ul>
<li> could remove some of the old plugins</li>
</ul>
</li>
<li> testing, looking at sizes of output trees</li>
<li> hope to start this week</li>
</ul>
</li>
<li> Eugene: what about the modulation of the ρs? Alex: sees
modulation every 30 degrees
<ul>
<li> reproduced in Monte Carlo</li>
<li> trying kinematic cuts that may enhance effect</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Beni">Beni</span></h2>
<ul>
<li> TOF efficiency study using Paul M.'s plugin
<ul>
<li> sees momentum dependence</li>
<li> poor efficiency at the edges of the array</li>
<li> central region efficiency good, over 90%</li>
</ul>
</li>
<li> new tubes: would have liked new data to study behavior
at lower gain
<ul>
<li> will explore replacing tubes in situ</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Mark_I.">Mark I.</span></h2>
<ul>
<li> new release of sim-recon out (2.9.0)
<ul>
<li> uses new hdds, root</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Lubomir">Lubomir</span></h2>
<ul>
<li> working with Mike Staib comparing residuals in the FDC
<ul>
<li> differences seen on a hit by hit basis, exploring
cause</li>
</ul>
</li>
<li> J/ψ work: track one electron (or positron), see other
in calorimeter
<ul>
<li> want to use these to measure efficiency</li>
<li> use the proton for the J/ψ (missing) mass</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Thomas">Thomas</span></h2>
<ul>
<li> looking at φ cross section
<ul>
<li> found count issue with DSelector: fixed it</li>
<li> see asymmetry in momentum distribution of K<sup>+</sup>,
K<sup>−</sup>, and proton, investigation</li>
</ul>
</li>
<li> looking at further development of event viewer</li>
</ul>
<h2><span class="mw-headline" id="Mark_D.">Mark D.</span></h2>
<ul>
<li> studying uncertainty and correlations in the BCAL</li>
<li> also looking at timing
<ul>
<li> gets better with momentum, then gets worse</li>
</ul>
</li>
<li> neutron final states: study timing and uncertainties
<ul>
<li> pulls for photons wide (σ=1.7), for neutrons narrow
(σ=0.6 to 0.7)</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Elton">Elton</span></h2>
<ul>
<li> reviewed SBIR proposal for DOE
<ul>
<li> Mark I and Lubomir doing same</li>
</ul>
</li>
<li> BCAL hardware got fixed while traveling</li>
</ul>
<h2><span class="mw-headline" id="Alexandre">Alexandre</span></h2>
<ul>
<li> continue with MCC interface duties</li>
<li> updating α<sub>s</sub> theoretical work in light of
recent developments in perturbative QCD</li>
<li> gave talk at CLAS Collaboration meeting</li>
<li> gave seminar at ODU</li>
<li> writing review of spin structure of the proton</li>
<li> writing proceedings contribution for SPIN16</li>
</ul>
<h2><span class="mw-headline" id="Paul">Paul</span></h2>
<ul>
<li> helping to prepare analysis launch
<ul>
<li> number of plugins up by 50%</li>
<li> found way to reduce memory usage of error matrices
in kinematic fits, substantial effect achieved</li>
</ul>
</li>
<li> CLAS analysis passed collaboration review
<ul>
<li> writing the paper</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Hovanes">Hovanes</span></h2>
<ul>
<li> working on 2D collimator motion control</li>
<li> found some small bugs in harp scan software</li>
<li> Eugene: puzzle with emittance? Hovanes: want to try
collimator scan in 2D
<ul>
<li> use small insert</li>
<li> measure polarization with shape of spectrum in pair
spectrometer</li>
</ul>
</li>
</ul>
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