[Halld-pid] Minutes, Time-of-Flight Meeting, March 15, 2012

[Mark M. Ito]

Time-of-Flight'ers,

Find the minutes at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_March_15,_2012#Minutes 
and below.

   -- Mark
   _____

GlueX TOF Meeting, March 15, 2012
Minutes

    Present:
      * FSU: Sasha Ostrovidov
      * JLab: Chuck Hutton, Mark Ito (chair), Tim Whitlatch

Prototype Status

    Sasha working on attaching the light guides to the prototype in a
    removable manner.

Mechanical Design

    Tim and Chuck have been working on changes from discussions at the last
    meeting. He remarked that good recommendations were offered by the FSU
    team.
      * The main support structure has been changed from a bent 1/2-inch
        plate to machined U-channel, where the basic stock is a standard
        item. This simplifies the manufacturing considerably, reducing it
        to machining one edge and possible straightening.
      * Mark reported Elton's concern about avoiding putting pressure on
        the scintillator to prevent crazing. This would mean support by the
        light guide only.
           + Tim pointed out that there might be significant stresses on
             the scintillator even then and wondered if that was a worry.
             Mark agreed to look into this.
           + Chuck was concerned that the flat section of the light guide
             next to the scintillator was a bit narrow to be used to
             support the entire module, given other tolerances that might
             move the support area. The flat section is only about 1 cm
             wide.
      * Tim brought re-raised the idea of scale models
           + a full-scale model of a corner of the array as Paul suggested
             last time
           + a 1/4-scale of the entire assembly, to look for
             assembly/installation problems
           + If the FSU Physics machine shop is available for this kind of
             work, then there are huge cost savings.
      * We will aim for another design meeting on Tuesday, March 20. Mark
        will try to set it up.

Action Items

      * Look into issue of avoiding pressure on the scintillator. -> Mark
      * Set up next design meeting. -> Mark

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