[Halld-pid] Start Counter Meeting Minutes, May 31, 2018

[Mark Ito]

Folks,

Please find the minutes below and at

https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_May_31,_2018#Minutes

   -- Mark

______________________


    GlueX Start Counter Meeting, May 31, 2018, Minutes

Present:

  * *FIU: * Werner Boeglin, Mahmoud Kamel
  * *FSU: * Sean Dobbs
  * *JLab: * Thomas Britton, Mark Ito (chair), Simon Taylor, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/xCY6G/%E2%80%8E> on the BlueJeans site 
<https://jlab.bluejeans.com/>. Use your JLab credentials to authenticate.


      Review of Minutes from the Previous Meeting

We went over the minutes from the meeting on March 8 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_8,_2018#Minutes> 
without significant comment.


      Calibration and Efficiency

Sean went over the state of things. See his slides 
<https://halldweb.jlab.org/wiki/images/4/40/Sdobbs_SC_May2018.pdf>] for 
plots and details.

We should nail down z-dependence of efficiency and resolution and 
complete the alignment studies we planned. Alignment parameters can be 
put into the geometry as perturbations to the nominal geometry. So far, 
only the CDC has done this. Sean showed a proposal for a parametrization 
of the perturbations. It was endorsed by the group.

Once the resolution is settled, he would also like to see the 
reconstruction report the errors on timing measurements.

He showed results from a prototype approach to getting time resolution 
as a function of z. He also showed results from the propagation time 
correction; there appears to be some systematic in the calibration 
scheme at the far end of the nose.

Lately there was some confusion about where the propagation time 
correction should go in the CCDB 
<https://halldweb.jlab.org/talks/2018/sc_prop_time_email_sdobbs.pdf>. 
That has been resolved now.

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