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Folks,<br>
<br>
Please find the notes below and at
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/Private:Hall_D_Staff_Meeting,_March_23,_2015">https://halldweb.jlab.org/wiki/index.php/Private:Hall_D_Staff_Meeting,_March_23,_2015</a>
.<br>
<br>
-- Mark<br>
______________________________<br>
<br>
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<span dir="auto">Private:Hall D Staff Meeting, March 23, 2015</span><br>
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<div id="siteSub">From GlueXWiki</div>
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">Present: Fernando Barbosa, Eugene Chudakov
(chair), Mark Dalton, Hovanes Egiyan, Sergey Furletov,
Mark Ito, David Lawrence, Lubomir Pentchev, Patrizia
Rossi, Elton Smith, Sascha Somov, Justin Stevens, Simon
Taylor, Tim Whitlatch, Beni Zihlmann
<br>
<br>
<br>
<span class="mw-headline" id="Announcements.2C_Eugene">Announcements,
Eugene</span><br>
<ul>
<li> DOE budget briefing:
<ul>
<li> FY16 lean operations budget</li>
<li> FY17 may get 30 weeks</li>
</ul>
</li>
<li> Simon is now Staff Scientist II!</li>
<li> DIRC review
<ul>
<li> currently waiting on MIT mirror development
results</li>
<li> Patrizia: status assessment a good reason to
hold review</li>
<li> will schedule something for summer</li>
</ul>
</li>
<li> conferences
<ul>
<li> Mark D. going to CIPANP</li>
<li> get your plans into Eugene ASAP</li>
</ul>
</li>
</ul>
<br>
<span class="mw-headline" id="Long-Range_Plan.2C_Patrizia">Long-Range
Plan, Patrizia</span><br>
<ul>
<li> Mon. Tue. next week: preparatory meeting for EIC
component</li>
</ul>
<br>
<span class="mw-headline" id="Solenoid.2C_Eugene">Solenoid,
Eugene</span><br>
<ul>
<li> last Wednesday's incident, three possibilities
<ol>
<li> quench or "flux jump"</li>
<li> motion of conductor</li>
<li> turn-to-turn short</li>
</ol>
<ul>
<li> similar incidents seen before</li>
</ul>
</li>
<li> plan: stay at 300 A for this week, 800 A may be OK
if needed</li>
<li> remedies
<ul>
<li> can reduce ramp rate</li>
<li> can introduce delay of 200 ms before magnet
dumped, avoids ramping down if voltage excursion
quickly self-correcting
<ul>
<li> this incident different from major quench 2
years ago, no signals on magnetic pick-ups
then</li>
</ul>
</li>
</ul>
</li>
<li> incident on Saturday during ramp down: extremely
short voltage excursion, 2 ms</li>
</ul>
<br>
<span class="mw-headline" id="Temperature_in_Hall">Temperature
in Hall</span><br>
<ul>
<li> Mark D.: regulating with fan speed temperature
<ul>
<li> try range from 4 to 6 kRPM</li>
<li> OK for FCAL, BCAL South, not enough dynamic
range for BCAL North</li>
</ul>
</li>
<li> Fernando: detailed understanding not there yet
<ul>
<li> will look at data from power supplies, voltages
stable or not?</li>
<li> back of racks: warmer than ambient, fans might
help</li>
<li> will test single board</li>
<li> pedestal variation should be on 14 to 16 bit
level with this temperature variation, not the
12-bit that we see</li>
<li> should try baffles, walls, or something in Hall
to further disperse flow from HVAC unit
<ul>
<li> Tim: will try something, several simple
options available</li>
</ul>
</li>
</ul>
</li>
</ul>
<br>
<span class="mw-headline" id="Run_Readiness.2C_David">Run
Readiness, David</span><br>
<ul>
<li> Optics experts were due at MCC at 1 pm today</li>
</ul>
<br>
<span class="mw-headline" id="Fourinert.2C_Lubomir">Fourinert,
Lubomir</span><br>
<ul>
<li> loss still a concern</li>
<li> Tim: consulted with manufacturer, we fill overflow
tank, perhaps liquid accounting issue?</li>
</ul>
<br>
<span class="mw-headline"
id="Shift_Takers.27_Info.2C_Elton">Shift Takers' Info,
Elton</span><br>
<ul>
<li> update target instruction</li>
<li> Tim will provide simplified solenoid operating
instructions</li>
<li> gluon nodes rebooting
<ul>
<li> David: gluon46 replaced with gluon48 for now</li>
</ul>
</li>
<li> photon beam procedures live mostly in log book
<ul>
<li> need to transfer to ops wiki</li>
</ul>
</li>
</ul>
<br>
<span class="mw-headline"
id="Survey_Data_for_Spring_2015.2C_Tim">Survey Data for
Spring 2015, Tim</span><br>
<ul>
<li> latest results in from Survey Group</li>
<li> Lubomir will make a link, like for Fall Run</li>
</ul>
<br>
<span class="mw-headline"
id="EIC_Consortium_Meeting.2C_Fernando">EIC Consortium
Meeting, Fernando</span><br>
<ul>
<li> RPC meeting held</li>
<li> RICH meeting next</li>
<li> meetings every other Monday</li>
<li> RICH-specific meeting every other Friday</li>
</ul>
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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
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