[Halld-pid] Start Counter Meeting Minutes, September 10, 2015

[Mark Ito]

GlueX'ers,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_September_10,_2015#Minutes 
.

   -- Mark
_____________________________________________________


  GlueX Start Counter Meeting, September 10, 2015, Minutes

Present:

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


      Announcements

The magnet will not be cold until mid-January. If we do get some running 
in December it will be with field off. We thought that for the start 
counter, a lot of the calibrations we might do with beam could be done 
under those conditions as long as background levels were reasonable.


      Run Readiness

We should start to look as cosmic ray data to check the health of the 
start counter systems.


      Calibration Update

Question from Sean: How much more data is needed to perform all 
calibrations with beam data? 10 times? 100 times?

Eric thought that based on his experience with using one run, run 2931 
(8 hours of data taking, 75 M events), we would need about 20 times more 
data to do a complete calibration.


      Review of minutes from the previous meeting

We looked atthe minutes from the August 13 meeting 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_August_13,_2015#Minutes>.

  * Eric continues to work on the calibration note. He is also putting
    together a not on the start counter construction and plans to
    revisit the start counter section of the TCR.
  * The last release of sim-recon (1.5.1) does not include that latest
    changes to the PID library and HDGeant. Their effect has not yet
    been studied thoroughly. They are present on the master branch.


      Efficiency Update

Mahmoud gave an update on his efficiency studies. For all of the details 
seehis slides 
<http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2800>. 
A few points from his presentation:

  * The problem with USE_SC_TIME has been resolved. The numbers are much
    more reasonable now.
  * The overall efficiency is about 91%, but there are still caveats.
  * There is a clear lack of efficiency at the tip of the nose section.
    This may be due to tracking resolution.
  * He will look at the efficiency in finer bins in z. For this
    presentation he looked at three regions: nose, bend, and straight.


      Collaboration Meeting

Eric and Mahmoud will get together and plan a talk in the PID session.

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  * This page was last modified on 10 September 2015, at 14:29.


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