[Halld-pid] Start Counter Meeting Minutes, August 26, 2016

[Mark Ito]

Folks,

Find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_August_26,_2016#Minutes 
.

   -- Mark

______________________


    GlueX Start Counter Meeting, August 26, 2016, Minutes

Present:

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

There is a recording of this meeting <https://bluejeans.com/s/s6OQm/> on 
the BlueJeans site.


      Efficiency Update

Mahmoud presented slides 
<https://halldweb.jlab.org/talks/2016/SC_meeting_AUG25_2016.pdf> with 
updated efficiency calculations and time resolution measurements. He 
used the output of the start counter efficiency plugin, written by Paul, 
from the reconstruction launch.

He showed efficiency results for each counter for all tracks, protons, 
π^+ , π^− , K^+ , K^− where he used the nominal particle ID provided by 
the plugin.

He also showed efficiency for various sections along the length of the 
start counter, 25 in all. There are some azimuth variations in the raw 
occupancy, but they do not show up in the efficiency calculation except 
for the extreme forward sections.

Time resolution was steady for most of the period of the Spring 2016 
run, with an average value of 281 ps. There appears to be some slight 
reduction, about 25 ps, of the resolution for 1350 A of solenoid current 
and 2 ns RF bucket separation. The origin of the effect is not understood.


      Run Readiness

  * Beni remarked that final readiness checks of the detector cannot be
    performed until the FADC firmware has been upgraded.
  * Mark will contact Eric Pooser and see if he can help us with
    physical check-out in the Hall.
  * The hot-checkout procedure is straight-forward, once everything is
    installed and powered up.
  * Beni mentioned that we will probably want to reduce the time window
    for ADC read-out to keep the VME backplane as quiet as possible.


      Calibration

Sean encouraged the group to write up the procedure for start counter 
calibration in a GlueX Note. Werner agreed, noting that the document 
should include step-by-step instructions for performing the calibration 
and we should develop the procedure so that those steps are fairly well 
automated.

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