[Halld-pid] Time-of-Flight Meeting Minutes, September 25, 2019

[Mark Ito]

Please find the minutes from today's meeting here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_September_25,_2019#Minutes> 
and below.

_______________________________________________


    GlueX TOF Meeting, September 25, 2019, Minutes

Present:

  * *FSU: * Jason Barlow, Edmundo Barriga, Paul Eugenio
  * *JLab: * Mark Ito (chair), Simon Taylor, Tim Whitlatch, Beni Zihlmann

There is a recording of this meeting <https://bluejeans.com/s/7j_E3/> 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 August 28 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_28,_2019#Minutes>. 
We have to remember to add the CAEN TDC non-linearity calibration to the 
run plan for November.


      Upgrade Status

  * Tim showed a photo (shown below) of a single PMT on the TOF which is
    out of alignment. Paul was not too concerned. Tim can shim things up
    so that the steel magnetic shield will fit. Beni will take a look at
    the tube with the scope to make sure it looks good from that point
    of view.
    TOF pmt.jpg <https://halldweb.jlab.org/wiki/index.php/File:TOF_pmt.jpg>
  * Paul asked how much torque was applied to the bolts holding the
    steel frame against the scintillator counters. Tim discussed this
    with the crew before performing the operation; they tightened the
    bolts until the between the frame and counters was compressed by 20%.
  * Tim reported that Survey and Alignment will be fiducializing the TOF
    today. The x-y position will be shot off the frame of the beamline
    hole. Roll, pitch, and yaw will be determined from points on the
    outer edge of the steel frame.
      o Mark mentioned it would be nice to have some kind of measurement
        of the increase in the width of the array beyond the sum of the
        theoretical scintillator width due to wrapping and geometric
        imperfections. Tim assured him this will come as a by-product of
        the survey.
  * We should add cable labels to the frame as was done for TOF I near
    the end of its life.
  * TOF will be mounted on the forward carriage on or about a week from
    Monday.
  * Once the array is mounted, Paul will turn to the design of the
    Lucite shield.


      NIM Paper

Beni reports that the calibration section of the paper is nearly done. 
The main lack at this point the construction section. Paul will turn to 
that once TOF II installation settles down.

We will come up with a backup scheme for the Overleaf site.

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  * This page was last modified on 25 September 2019, at 14:36.

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