[Halld-pid] Minutes, Gluex Start Counter Meeting, September 8, 2011

[Mark M. Ito]

Folks,

Find the minutes at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Start_Counter_Meeting%2C_September_8%2C_2011#Minutes 
and below as text.

   -- Mark
  ______

GlueX Start Counter Meeting, September 8, 2011
Minutes

    Present:
      * FIU: Werner Boeglin, Lei Guo, Puneet Khetarpal, Eric Pooser
      * JLab: Chuck Hutton, Mark Ito (chair), Tim Whitlatch, Beni Zihlmann


Review of Drawings

    We reviewed drawings that Tim posted:
      * [29]Werner's side view
      * [30]Werner's end view
      * [31]Tim et al.'s drawing from 2009

    We discussed mechanical considerations for SiPM read-out:
      * The big difference between the 2009 drawing and the current concept
        (though not shown in Werner's drawings) is we want to use a very
        short-light guide, mounting the SiPM's as close to the scintillator
        as possible. There is very little space in for doing this.
      * Werner prefers a 30-counter design (versus the original 40).
        Fitting the SiPM's close to the counters almost forces us to this.
      * It is unlikely that we can provide for cooling other than air
        circulation given the space constraints.
      * Werner pointed out that we could use the support tube need not be
        made of Rohacell all they back to the supporting flange. A thinner,
        stronger material could be used for the cantilever up to the SiPM
        mounting.
      * Tim et al. will generate a new drawing based on Werner's
        dimensions. He will aim for the next meeting (in two weeks).


MOU

    Werner reported that the University wants some changes to the MOU,
    though none of them are major. He has some paper work left to do finish
    generating a revised document.

Plastic Craft Scintillator

    Lei has been in contact with the company. They claim they can do a
    better job on the scintillator surfaces. He will send some of the
    current samples back to them for re-polishing.

Communication

      * The new meeting time is OK with everyone.
      * We don't need the phone connection anymore. If needed it can be
        requested.


Action Items

      * Produce new drawings of the start counter.
      * Send some samples back to Plastic Craft for re-polishing.
      * Further timing tests with the SiPM.
      * Get MOU changes back to JLab for review.

    Retrieved from
    
"http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Start_Counter_Meeting%2C_September_8%2C_2011"

References

   29. 
https://halldweb1.jlab.org/talks/2011-3Q/Start%20counter%20layout%20Werner-Aug%202011.pdf
   30. 
https://halldweb1.jlab.org/talks/2011-3Q/Start%20Counter%20layout%201%20Werner%20Aug%202011.pdf
   31. 
https://halldweb1.jlab.org/talks/2011-3Q/HALL-D%20HYDROGEN%20TARGET%20GENERAL%20LAYOUT.pdf