[Halld-pid] Start Counter Meeting Minutes, May 2, 2019

[Mark Ito]

People,

Please find the minutes below and here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_May_2,_2019#Minutes>.

   -- Mark

________________________________________________________________


    Minutes, GlueX Start Counter Meeting, May 2, 2019

Present:

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

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


      Efficiency

Mahmoud reported that Thomas Britton asked him for efficiency numbers 
for the start counter as part of his presentation to the Workshop on 
Comparison of Data and Monte Carlo at the Collaboration Meeting. Mahmoud 
plans to generate efficiency as a function of /z/ for recent data. He is 
hoping for the best as the code has not been run for several months.


      SiPM Dark Current

Beni looked a bit more at the data collected during the last run. There 
are slight variations counter to counter. From the beginning to the end 
of the run he sees slight degradation, but not enough to cause concern.

He recommends that we keep an eye on the dark current, especially with 
the upcoming run at high intensity. We should get into the habit of 
taking data to check the dark rate.

On a related issue, Beni notes that the nominal rates per paddle have 
been 300 kHz. If we double the intensity, that would present a challenge 
to the counters.

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  * This page was last modified on 2 May 2019, at 10:48.

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