[Halld-pid] Start Counter Meeting Minutes, December 15, 2016

[Mark Ito]

Folks,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_15,_2016#Minutes 
.

   -- Mark
______________________


    GlueX Start Counter Meeting, December 15, 2016, Minutes

Present:

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

There is a recording of this meeting <https://bluejeans.com/s/vMpO3/> on 
the BlueJeans site.


      Announcements

We had some beam in the Hall last night. The solenoid was successfully 
ramped to 1,200 A. The tagger magnet is down; repairs are underway.


      Review of minutes from the last meeting

We went over the minutes from the meeting on December 1 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_1,_2016#Minutes>. 
Mahmoud has started looking a the "survey" of the start counter paddles 
with charged tracks. He will report results when they become available.


      Corrections to Efficiency due to Accidentals

Mahmoud has updated his start counter efficiency study to take into 
account accidental hits. See his slides 
<https://halldweb.jlab.org/talks/2016/SC_meeting_Dec15th_2016.pdf> for 
the details.

Accidental rate was measured by looking at sidebands of the SC hit time 
distribution. He measures the following overall efficiencies:


	Before Accidental Correction 	With Accidental Correction
Simulation 	97.5±0.2% 	95.9±0.2%
Data 	96.4±0.2% 	95.4±0.3%

He showed efficiencies as a function of sector number. Also results for 
the straight, bend, and nose regions were shown separately.


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