[Halld-pid] Time-of-Flight Meeting Minutes, October 9, 2019

[Mark Ito]

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_October_9,_2019#Minutes> 
and below.


    GlueX TOF Meeting, October 9, 2019, Minutes

Present:

  * *FSU: * Edmundo Barriga, Ashley Ernst, Sasha Ostrovidov
  * *JLab: * Mark Ito (chair), Simon Taylor, Tim Whitlatch, Beni Zihlmann

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


      Review of minutes from the last meeting

We reviewed the minutes of the meeting on September 25 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_September_25,_2019#Minutes>. 


  * Beni has looked at the channel with the drooping PMT that was
    pointed out last time and it looks good on the scope. Tim agrees
    with Paul that the glue joint is intact on that end of the counter.
    See Tim's photo
    <https://halldweb.jlab.org/wiki/images/c/c4/TOF_ASSY.jpg> and see if
    you can find the PMT in question.
  * Tim will ask the guys to put new labels on the frames to indicate
    which cables go where.


      Upgrade Status

We looked at Tim's recent HDList entry 
<https://halldweb.jlab.org/talks/2019/hdlist_tof.pdf>.

  * The support frames will be put on today.
  * The array will be mounted on the forward carriage tomorrow.
  * Survey will be done on Friday.
  * The TOF will be aligned with the FCAL. It is known that the FCAL is
    6 mm off from beam center, but there is no plan to move it. If such
    a plan develops, the TOF will move with it.


      Software Issues


        TOF Component and Cabling Tables

Mark has put together a database that accounts for all components of the 
TOF including cables and their connections. Tables in the database 
account for the following:

 1. Modules
 2. PMTs
 3. Signal cables
 4. Splitters
 5. ADC cables
 6. ADCs
 7. Discriminator cables
 8. Discriminators
 9. TDC cables
10. TDCs
11. HV cables
12. HV cards

He relies on spreadsheets obtained from Nick Sandoval for all of the 
cable connections. The database for TOF II (upgraded configuration) is 
complete. That for TOF I (legacy configuration) still needs a few 
components (but is by now an academic exercise).

Database queries can be composed to generate several different views of 
the data. Mark showed three examples, all generated with a one-line query:

 1. Module/PMT map for TOF I
    <https://halldweb.jlab.org/detectors/tof/tofmap1.html>
 2. Module/PMT map for TOF II
    <https://halldweb.jlab.org/detectors/tof/tofmap2.html>
 3. Crate/slot/channel map for TOF II ADCs
    <https://halldweb.jlab.org/detectors/tof/adc2_report.html>

A new, independent labeling scheme is introduced, which is oriented 
toward reconstruction:

  * "H" or "V" for horizontally oriented modules or vertically oriented
    modules
  * "01" to "46" for the 46 PMTs along an edge, running from negative x
    (or y) to positive x (or y) in the global GlueX coordinates
  * "+" or "-", + for the positive end of the module in x (or y), - for
    the negative end

Example (3) can be used to generate the translation table for ADC 
read-out. Similar tables can be generated for the HV and the TDCs 
electronic channel maps.


        Monte Carlo Status

Ashley reports that there is still a problem with HDGeant4 vis-a-vis the 
upgraded TOF. See HDGeant4 Issue #123 
<https://github.com/JeffersonLab/HDGeant4/issues/123>, "TOF geometry 
generalization."


      TOF NIM paper

Beni encouraged Sasha to start writing up the section on module testing 
and certification. Sasha will prepare a draft by next week.

Retrieved from 
"https://halldweb.jlab.org/wiki/index.php?title=GlueX_TOF_Meeting,_October_9,_2019&oldid=94427"

  * This page was last modified on 9 October 2019, at 16:14.

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