[Halld-pid] Start Counter Meeting Minutes, January 11, 2018

[Mark Ito]

Colleagues,

Please find the minutes of today's meeting reproduced below and on the 
web at

https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_January_11,_2018#Minutes 
.

   - Mark

____________________________________


    GlueX Start Counter Meeting, January 11, 2018, Minutes

Present:

  * *FIU *: Mahmoud Kamel
  * *JLab *: Thomas Britton, Mark Ito (chair)

There is a recording of this meeting <https://bluejeans.com/s/vMWCP> on 
the BlueJeans site <https://jlab.bluejeans.com/>. Use your JLab 
credentials to authenticate.


      Announcements

  * Beam arrived in the Hall this morning.


      Raw Hit Rate vs. Photon Flux

Thomas reported that the rate of raw hits in the start counter seems to 
scale reasonably well with photon flux. He has been studying this for 
all detector systems. See 
[[January_10,_2018,_Analysis_Working_Group#Analysis_Focus:_Total_Cross_Sections.2C_Acceptance_Corrections|minutes 
of yesterday's Analysis Meeting].


      Review of minutes from the last meeting

We went over the minutes from November 16 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_16,_2017#Minutes>. 
Mahmoud noted that he found the bggen events that Thomas has generated 
and used them for his comparisons of MC and data.


      Calibration and Efficiency

We went over Sean Dobbs's list of start counter issues 
<https://halldweb.jlab.org/talks/2017/sean_st_issues.pdf> from November.

  * Mahmoud has been looking at bggen data (as mentioned above) and
    comparing MC and data.
  * Work on resolution as a function of momentum has not been reported.
  * Mahmoud sent Sean some results on the time resolution as a function
    of z.
  * Progress on alignment has not been reported.


      Collaboration Meeting Discussion

Mahmoud will give a short update on calibration/efficiency/performance 
at the upcoming Collaboration Meeting 
<https://halldweb.jlab.org/wiki/index.php/GlueX-Collaboration-Feb-2018>.


      NIM/TDR

A draft of the NIM paper has been circulated to the collaboration 
<https://mailman.jlab.org/mailman/private/gluex-collaboration/2017-December/004717.html>. 
the deadline for feedback has passed, but we thought that comments might 
still be accepted.


      Meeting time: is 10 am OK

Mark has a schedule conflict and proposed meeting at 10 am rather than 
11:00 or 11:30 am. All agreed that this is acceptable. Mark will make 
and announce the change.

-- 
Mark Ito, marki at jlab.org, (757)269-5295

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