[Halld-pid] Start Counter Meeting MInutes, March 5, 2020

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_5,_2020> 
and below.

   -- Mark


    GlueX Start Counter Meeting, March 5, 2020, Minutes

Present:

  * *FSU: * Sean Dobbs
  * *JLab: * Rupesh Dotel, Tolga Erbora, Mark Ito, Simon Taylor, Beni
    Zihlmann

There is a recording of this meeting <https://bluejeans.com/s/C9Djj/> on 
the BlueJeans site. Use your JLab credentials to gain access.


      Review minutes from the last meeting

We looked at the minutes from the February 6 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_February_6,_2020#Minutes> 
without significant comment.


      Calibration and Efficiency

Rupesh presented recent work on calibrating the propagation delay for 
the start counter for the current run. See his slides 
<https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4371> 
for the details. From his talk, before and after calibrations plots of 
start counter hit time vs. position in paddle 1.

Sc calibration rupesh.png 
<https://halldweb.jlab.org/wiki/index.php/File:Sc_calibration_rupesh.png>

The timing resolution he gets is about 320 ps for 150 nA running and 
330 ps for 350 nA running. Jobs take a long time to run because he needs 
a full run of statistics and tracking must be done to get a position 
along the start counter paddle.

Rupesh will update constants in the CCDB and re-do the calibrations 
periodically to check stability.


      Dark Rate Studies

  * Beni took some data earlier this week. Stay tuned for results...
  * Young collaborators from Miami will look into taking on more
    responsibility in this area.

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  * This page was last modified on 7 March 2020, at 19:32.

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