[Halld-pid] Start Counter Meeting Minutes, November 19, 2015

[Mark Ito]

Folks,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_19,_2015 
.

   -- Mark
__________________________________________


  GlueX Start Counter Meeting, November 19, 2015, Minutes

Present:

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


      Run Readiness

We will operate the start counter as usual during the upcoming run, even 
though the plastic target will be downstream of the counter and the 
tracking chambers will be off.

The target/start-counter have been retracted from the bore. When they 
are re-installed, Eric will go though the Hot Checkout procedure. He did 
a similar some weeks ago before the first insertion, at Tom Carsten's 
request.


      Calibration Update

Mahmoud gave us an update on the time-walk calibration plug-in that will 
be part of theCalibration Challenge 
<https://halldweb.jlab.org/wiki/index.php/Calibration_Challenge>. See 
his slides for the details.

He has checked in the plug-in and associated ROOT macros. The average 
resolution is about 270 ps. Sector 20 shows noticeably worse resolution 
and indeed the time-walk function is not fitting the data very well. 
Mahmoud will push ahead with other components of the Calibration 
Challenge for now, but we may revisit the procedure for time-walk 
calibration at a later date.


      Asymmetry in Monte Carlo

Mark showed aplot 
<https://halldweb.jlab.org/talks/2015/st_hits_sim1.pdf>from Sean Dobbs 
showing an asymmetry in the occupancy of the start counter in recent 
Monte Carlo data. Simon told us there there is a tilt to the start 
counter in the Monte Carlo and we concluded that that is likely the cause.

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  * This page was last modified on 20 November 2015, at 13:12.


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