[Halld-jlab] Hall D Staff Meeting Notes, November 23, 2020

[Mark Ito]

Folks,

Please find the notes here and below.

   -- Mark

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    Hall D Staff Meeting, November 23, 2020

Present: Alexander Austregesilo, Eugene Chudakov (chair), Mark Dalton, 
Alexandre Deur, Hovanes Egiyan, Sergey Furletov, Mark Ito, Igal Jaegle, 
Keigo Mizutani, Lubomir Pentchev, Elton Smith, Sascha Somov, Simon 
Taylor, Tim Whitlatch, Beni Zihlmann


    Announcements, Eugene

  * There was a quarantine issue with the machine shop. Resolved now.
  * Memo went out about working remotely from a different state.
  * Initial budget outlook: looks about the same as last year.
  * User count dropped from 1700 to 1600. Number of foreign users went
    down. Domestic university users went up a bit.
  * Fill out your timesheets daily.
  * For computers used at home, make sure to keep property passes
    up-to-date.
  * EIC Yellow Paper process entering final stages.
      o Discussion on including a second detector and ways to fund it.
          + Not part of current DOE plan.
          + Beni: machine design can accommodate two detectors.
      o JLab will participate in detector R&D
          + Will bring in local expertise with lead tungstate crystal
            calorimeters.


    Tasks for Rest of the Year, Tim

  * Big one: DIRC tests and experiments
      o Take apart optical box, test mirrors
      o Schedule on the O-drive
  * Tagger window done, hodoscope and microscope re-installed
  * Leak in Hall: Tim will look into it
  * Coil 3:
      o After refurbishment of cold cathode gauge showed measurable leak
        rate.
      o Not as bad as coils 2 and 4.
      o Pumping on it now


    Cleaning electronics boards, Beni

  * Not all cleaned, but project stopped because of limited space
  * Eugene: analysis of dust showed some iron, probably in the form of
    iron oxide


    Crystals, Sascha

  * Almost done measuring dimensions, doing visual inspection
      o of 160, 8 still left to check
      o better than previous batch, some have coloring
      o will likely accept for purchase
  * Will touch base with Carl Zorn about measuring transmittance
  * Balance of contracted crystals will be sent in a few weeks.
  * Josh and Sascha have exercised brazing set-up.
      o Will assemble 10 to 20 modules, then go to mass production
  * CompCal is open in the TEDF
      o Will be meeting with Fernando to finalize electronics
      o Refurbishing light monitoring system for CCAL


    Measurements with Gas Analyzer, Lubomir

  * To be done this year


    PMT Replacement, Beni

  * one candidate for replacement
  * no need to dismount array from forward carriage
  * need detailed instructions from Paul Eugenio


    DIRC Mirrors, Eugene

  * Water leaked between the mirror and the protective glass cover
  * Diffusers for the LED system leaked as well
  * Alternate geometries for sealing mirrors being considered.
  * No measurable degradation in performance.


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