[Halld-pid] Minutes, GlueX Start Counter Meeting, August 25, 2011

[Mark M. Ito]

Folks,

Find the minutes posted at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Start_Counter_Meeting%2C_August_25%2C_2011#Minutes 
and below.

   -- Mark
  _____

GlueX Start Counter Meeting, August 25, 2011
Minutes

    Present:
      * FIU: Werner Boeglin, Lei Guo
      * JLab, CEBAF Center: Simon Taylor, Beni Zihlmann
      * JLab, ARC: Chuck Hutton, Mark Ito (chair), Puneet Khetarpal


New Meeting Time

    We decided to move the meeting time from 3:30 pm to 10:00 am. Same day
    of the week, every other Thursday.

Prototype News


Light guide tests

    FIU tried out the new fiber light guide. If anything, it was a bit
    worse than the solid light guide that has been used for some time now.

New SiPM pre-amp test

    Werner sent the SiPM array FIU had previously tested back to Fernando
    Barbosa and Fernando outfitted it with his new pre-amp configuration
    and sent it back to Miami. A test was set-up yesterday, with the SiPM
    butted up against on of the Plastic Craft scintillators. Without a lot
    of adjustment a resolution of 350 ps was observed. This is to be
    compared with the 500-600 ps observed with the SiPM previously.

    The next step is to make a small short light guide to match the area of
    the scintillator to that of the SiPM array.

Scintillator characterization

    The tests thus far have been with the worst looking of the Plastic
    Craft scintillator. All five will be tested and compared. As mentioned
    before the surfaces to not look all that nice.

    Werner's estimate is that the number of photoelectons per MeV is 25 to
    35 at a point 10 inches away from the SiPM (in the middle of the barrel
    section).

Drawings

    Werner sent Tim the latest drawings about a month ago. Chuck will get
    them from Tim.

MOU

    The MOU is stuck in legal at FIU. It will be expedited.

Reconstruction

    Puneet has been working with Sascha on the reconstruction. He hopes to
    present some results from studies next time.

New action items

      * Move time of meetings on the various calendars. -> Mark
      * Get drawings from Tim. -> Chuck
      * Characterize all Plastic Craft scintillators. -> FIU

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