GlueX TOF Meeting, July 21, 2011

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Location, Time

NOTE: new standard room, date, and time!

Thursday, July 21, 2011
10:00 am EDT
JLab: CEBAF Center, Room F326


  1. Announcements
  2. Minutes from the last meeting
  3. Prototype Status [1]
  4. Contract Status



  1. ESNet: 8542553
  2. EVO: EVO site


  1. dial:
  2. enter access code followed by the # sign: 3421244#


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2011-3Q on the JLab CUE. This directory is accessible from the web at .



  • FSU: Paul Eugenio, Sasha Ostrovidov
  • JLab: Eugene Chudakov, Chuck Hutton, Mark Ito (chair), Simon Taylor, Beni Zihlmann


  • Ian Winger sent Chuck a 3-D drawing of the split light guides.
  • Paul will be busy with his DOE annual for the next week or so.
  • Three more light guides have been made from the UVT material.
    • These will be compared to non-UVT versions.
  • FSU Physics machine shop playing with procedure for fabrication.
    • They are getting good finishes with the new bit.
  • One light guide, was sent to Polymer Plastics for vapor polishing. It was due back this week.
  • Paul has talked to folks at Eljen about how they do polishing
    • Although vapor polishing will give good results, it is likely not better than hand polishing.
    • Paul purchased got some polishing compounds to try.
    • The Physics Department bought a new buffing station suitable for light guides.
  • No testing with the new light guides has been done yet.
  • Paul will send Chuck the dimenions of the steel tube.


Paul prepared a version of the statement of work, but the text was lost. Mark volunteered to write a draft.

Time-Walk Correction Tests

Sasha tried out the technique that Elton described in a recent note. See his plots for details. Cosmic data taken with prototype counters show some of the general features expected, but there is a non-Laudau distributed background in the sample that complicates the fits.