[Halld-pid] Time-of-Flight Meeting Minutes, January 27, 2021

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_27,_2021#Minutes> 
and below.

   -- Mark

     _____________________________________________


    GlueX TOF Meeting, January 27, 2021, Minutes

Present: Eugene Chudakov, Mark Ito (chair), Sasha Ostrovidov, Susan 
Schadmand, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/8GZxYxK2JpK/>. 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 from January 13 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_13,_2021#Minutes> 
without significant comment.


      PMT Repair

  * Prompted by Sasha's question at the last meeting, Beni checked on
    the HV settings of the tubes that are candidates for replacement. He
    found that they are all on the low side, 1210 to 1290 V. Based on
    that, he thinks that we should replace only two of the PMTs (PMTs 69
    and 113) rather than the five he identified last time.
  * Sasha reminded us that all of the single-ended, new-in-TOF-II
    modules have the end surface near the beam hole blackened.
  * Sasha told us that Paul Eugenio is willing to come up to the Lab to
    do the replacement, but the required two-week quarantine makes that
    impractical.
  * The tubes will be replaced in situ (no need to remove the entire
    array from the forward carriage).
  * Beni proposed practicing PMT replacement on one of the unused
    modules in the Hall.
  * Mark suggested that as we learn how to do the replacement, we also
    train a member of the technical staff on the task.


      TOF II Trigger

Beni ran down the activity in progress on standing up a trigger with TOF 
II.

  * We want to present progress at the CPP/NPP readiness review.
  * Hai Dong told Beni that all changes necessary to support the TOF II
    geometry can be done in the crate trigger processor (CTP). Nothing
    upstream of the CTP need be modified.
  * Hai has written up a work plan. Elton presented it at the CPP
    meeting this morning.
      o The work will take 4 weeks.
      o 2 to 3 weeks will be needed for bench testing.
      o Sascha Somov will have to test the system in the Hall after
        that, either with cosmics or (most likely) with beam.
  * The plan puts us on track for having the system ready for beam tests
    before the August run.
  * Beni and Mark will meet to confirm channel assignments as
    transmitted to Hai. Mark has the map that was used to create
    translation tables that have worked in recent data taking.


      TOF NIM paper

No known progress.


      Action Item Recap

 1. Decide on when to ship PMTs to JLab from FSU (Mark, Paul Eugenio)
 2. Prepare a complete draft of the TOF NIM paper. (all)
 3. Make a plan for TOF repair during the SAD, including Paul in the
    discussion. (all)
 4. Renew the equipment loan agreement between JLab and FSU (Mark, Paul)


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