[Halld-pid] Time-of-Flight Meeting Minutes, October 6, 2021

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_October_6,_2021#Minutes> 
and below.

   -- Mark

      ___________________________________


    GlueX TOF Meeting, October 6, 2021, Minutes

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

There is a recording of this meeting 
<https://bluejeans.com/s/mkLTUR8xvId/>. Log into the BlueJeans site 
<https://jlab.bluejeans.com> first to gain access (use your JLab 
credentials).


      Review of minutes from the last meeting

We went over the minutes of the meeting on August 25 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_25,_2021#Minutes>. 


  * After replacement of the FADCs, Beni performed a voltage scan,
    analyzed the data, and reset PMT voltages accordingly to equalize
    gains. A gain calibration was performed and the resulting energy
    calibration tables are now in the CCDB.
  * The RF signal, measured with a CAEN TDC in the TOF crate, is now
    better than it has ever been. Beni solved the issue with a wide time
    distribution by inserting a discriminator (with appropriate level
    conversion modules) in front of the jitter attenuation box [?].


      News from the Run

Beni updated us on several areas of activity.

  * The acrylic shielding near the beam line has been removed at the
    direction of the PrimEx leadership. The rates around the beam line
    look reasonable nonetheless.
  * Timing Calibration for PrimEx run
      o To get adequate statistics for the outer counters, he must
        analyze all of the data from any given run. The online skims do
        not produce enough data. This is due to the character of the
        PrimEx data.
      o He has been working on automating the calibration procedure.
      o The walk corrections have been done and uploaded to CCDB.


      Student from SRC

Jackson Pybus, an MIT student, will be working on TOF calibration for 
the SRC experiment. Beni has been in contact with him and will provide 
advice going forward.

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