[Halld-pid] Start Counter Meeting Minutes, July 12, 2018

[Mark Ito]

Folks,

Please find the minutes below and at

https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_July_12,_2018#Minutes

   -- Mark

_________________________


    Minutes, GlueX Start Counter Meeting, July 12, 2018

Present:

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

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


      Review minutes from the meeting on June 28

We reviewed the minutes 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_28,_2018#Minutes> 
without significant comment.


      Propagation Time Corrections and Time Resolution

Mahmoud presented his latest results, a refinement of his results from 
last time. See his slides 
<https://halldweb.jlab.org/talks/2018/SC_Meeting07_12_2018.pdf> for 
details and plots. His summary slide is reproduced here:

  * New propagation time constants are obtained using one dimensional
    fits (3-start-counter-z-region constants) for 2017 & 2018 run periods.
  * 3-region and 4-region (with variable vertices) fits were tested.
    There is no significant difference.
  * The time resolution from ST_Tresolution plugin, where the RF time is
    determined based on the hit to the SC, is calculated. This time
    resolution is better by ~20ps than that calculated from the PT plugin.
  * Coming soon: Push the changes to github and the constants to CCDB.

There are still some checks to do; those should take about a week on the 
farm. We suggested that he consult with Sean Dobbs before putting these 
new constants into the CCDB, especially since a reconstruction launch 
over the 2017 data is imminent.

Retrieved from 
"https://halldweb.jlab.org/wiki/index.php?title=GlueX_Start_Counter_Meeting,_July_12,_2018&oldid=88227"

  * This page was last modified on 13 July 2018, at 09:15.

-- 
Mark Ito, marki at jlab.org, (757)269-5295

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