[Halld-pid] Start Counter Meeting Minutes, January 14, 2016

[Mark Ito]

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_January_14,_2016#Minutes 
.
________________________


  GlueX Start Counter Meeting, January 14, 2016, Minutes

Present:

  * *FIU*: Werner Boeglin, Mahmoud Kamel
  * *JLab*: Mark Ito (chair), Eric Pooser, Simon Taylor, Beni Zihlmann

There is arecording of this meeting <https://bluejeans.com/s/8_WI/>on 
the BlueJeans site.


      Announcement

  * Eric has finished writing his thesis!


      Review ofMinutes from the Last Meeting
      <https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_3,_2015#Minutes>

We looked at the minutes from December 3. Items of note appear on the 
agenda of this meeting.


      Missing channels in Fall 2015

  * We reviewed thelog entry from Nick Sandoval
    <https://logbooks.jlab.org/entry/3369430>. Mark will follow up with
    Nick on any new news.
  * Eric mentioned that he has seen this kind of disconnect of the low
    voltage before when the pre-amps were not well seated.
  * Mark spoke with Tim about Tim's idea of adding a fixture for
    ensuring that the pre-amps stay plugged in. Tim thought that even
    though the problem this time had nothing to do with those
    connections, he is going ahead and has assigned a designer. In light
    of Eric's remark, this makes sense.
  * [Added in press] Mark talked to Nick. The low-voltage cable checked
    out fine. It is back in the system. Nick mentioned that when this
    kind of disconnect occurs, it shows up as a 10% reduction in current
    from the power supply. That current is monitored in EPICS; we should
    alarm on it.


      Calibration Update

Mahmoud has done a complete calibration of the light propagation delay 
on a counter-by-counter basis. The code is contained in plug-ins 
appropriate for inclusion in the calibration challenge. He measures a 
time resolution for the start counter of less than 300 ps. For details, 
please seehis slides 
<http://argus.phys.uregina.ca/gluex/DocDB/0029/002907/001/ST_propagation_correction.pdf>.


      Run Readiness

Mahmoud went through theslides he presented 
<http://argus.phys.uregina.ca/gluex/DocDB/0029/002904/001/Spring_2016_RunPlan.pdf>at 
yesterday's Run Coordination meeting. The bias scan we did last Spring 
needs to be repeated because the FADC thresholds were changed in the 
middle of the scan.


      Collaboration Meeting
      <https://halldweb.jlab.org/wiki/index.php/GlueX-Collaboration-Feb-2016>

We agreed that Mahmoud should present his calibration results, pending 
approval from his thesis adviser.

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  * This page was last modified on 16 January 2016, at 21:02.


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