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PID'lers,<br>
<br>
Find the minutes below and at<br>
<br>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_March_31,_2015#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_March_31,_2015#Minutes</a><br>
<br>
-- Mark<br>
________________<br>
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<span dir="auto">GlueX TOF Meeting, March 31, 2015</span><span
class="mw-headline" id="Minutes">, Minutes</span><br>
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<br>
Present:
<br>
<ul>
<li> <b>FSU</b>: Brad Cannon, Paul Eugenio, Aristeidis
Tsaris</li>
<li> <b>JLab</b>: Mark Ito (chair), Beni Zihlmann</li>
<li> <b>NU</b>: Sean Dobbs</li>
</ul>
<br>
<span class="mw-headline" id="Running_at_6_GeV">Running at
6 GeV</span><br>
<br>
We discussed implications for the TOF of running at lower
energy.
<br>
<ul>
<li> At lower energy there will be more of the kaon
spectrum in the range where the TOF is useful.</li>
<li> The pattern of rates near the beamline will be
different. This will throw off any rate studies.</li>
<li> At lower energy using the FCAL for a trigger may be
more difficult. The TOF can be used in coincidence to
help.</li>
<li> For most of our other goals data with lower energy
should not affect things. In particular, most
calibrations can go forward.</li>
</ul>
<br>
<span class="mw-headline"
id="TOF_Matching_with_Charged_Tracks">TOF Matching with
Charged Tracks</span><br>
<br>
Sean showed some plots showing how well track matching is
being performed for the Fall data. See <a
href="https://halldweb.jlab.org/wiki/images/4/4b/TOF_Meeting_20150331.pdf"
class="internal" title="TOF Meeting 20150331.pdf">his
slides</a> for details.
<br>
He showed a set of plots for each of two conditions, one
set with the nominal 6 cm miss distance criterion and one
set with the cut relaxed to 20 cm. There is marked
improvement with the wider cut, giving us confidence that
better channel-to-channel time calibrations will improve
the situation greatly.
<br>
<br>
<span class="mw-headline" id="Calibration">Calibration</span><br>
<br>
Beni and Simon Taylor are working on a quick-and-dirty
calibration. Beni has passed constants to Simon and they
are discussing how to incorporate them into the
reconstruction.
<br>
Beni is seeing a systematic variation, from the inner
paddles to the outer paddles, where uncalibrated times
trend later on the outside, from 5 to 10 ns. This is not
understood at present.
<br>
<br>
<span class="mw-headline" id="Online_Monitoring">Online
Monitoring</span><br>
<br>
Beni has checked in additional online monitoring plots.
These will support his calibration scheme and as such may
get us started with online TOF calibrations.
<br>
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<li id="lastmod"> This page was last modified on 1 April 2015,
at 20:23.</li>
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<br>
-- Mark M. Ito, Jefferson Lab, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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