[Halld-pid] Start Counter Meeting Minutes, June 28, 2018

[Mark Ito]

Starters,

Please find the minutes below and at

https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_28,_2018#Minutes

   -- Mark

_______________


  GlueX Start Counter Meeting, June 28, 2018


    Minutes

Present:

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

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


      Review minutes from the meeting on June 14

Review of the minutes 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_14,_2018#Minutes> 
was done without significant comment.


      Propagation Time Corrections

Mahmoud described a new method for obtaining the light propagation time 
corrections. This approach fits one-dimensional histograms of 
walk-corrected times where each histogram comes from a bin in z 
(actually, length along the counter). z-position is determined by 
charged particles.

For all of the details, please see Mahmoud's slides 
<https://halldweb.jlab.org/talks/2018/SC_Meeting06_28_2018.pdf>.

This method seems much more robust than the previously tried fits to a 
two-dimensional histogram. The details of the function used to smooth 
the bin-to-bin fluctuations in the correction is still being developed.

There was some discussion of whether the hits in the forward-most bin, 
where the exact geometry of the counters is uncertain, should ever be 
used in reconstruction. We did not come to a conclusion about this.


      World Cup Re-Cap

Switzerland is through to the knock-out round. Egypt did not make it. 
The US is absent from this year's tournament on account of a 
heart-breaking loss to Trinidad & Tobago.


      Time-dependent geometry adjustments

Sean reported that work will resume after the reconstruction launch 
lock-down is past.


      NIM Paper

Werner reported that Eric Pooser has been busy with software 
presentations lately and that work will resume soon.

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