[Halld-pid] Start Counter Meeting Minutes, September 2, 2021

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_September_2,_2021#Minutes> 
and below.

   -- Mark

      ___________________________________


    GlueX Start Counter MeetingMinutes, September 2, 2021,

Present: Eugene Chudakov, Mark Ito (chair), Simon Taylor, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/uL11l3Qn6fR/> on the BlueJeans site. Use your 
JLab credentials to gain access.


      Review of minutes from the last meeting

We took a quick glance at the minutes from July 22 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_July_22,_2021#Minutes>. 
There was not a lot to discuss.


      Run preparations

Two items of concern about the start counter as we go into the run.

  * *Broad pedestals*. See Beni's logbook entry
    <https://logbooks.jlab.org/entry/3897716> for the details. This
    effect is seen in all channels. Also the change occurred after the
    last run, i.e., during a period when there was no beam in the Hall.
    Sergey did a re-set of the pedestal levels in the F250s and took
    data. Beni will look at these new data next.
  * *Elevated temperature*. One of the ten temperature channels (one
    channel per read-out board) is anomalously high (several degrees C).
    See [https://logbooks.jlab.org/entry/3897599
    <https://logbooks.jlab.org/entry/3897599> Nick Sandoval's logbook
    entry for the details. Nick found some pins in the cable that had
    been pushed out of position, but fixing those reduced noise on the
    signal but did not change the temperature level. Beni will look at
    pedestals in the three channels on this board and compare to the others.


      Bias Voltage Scan

Beni pointed out that we have never looked at start counter performance 
using bias voltages other than the nominal ones. Mark will ask the BCAL 
folks about what they have done on this, what they looked at in the 
data, and what they learned from the exercise.


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