[Halld-pid] Minutes, GlueX TOF Meeting, May 27, 2011

[Mark M. Ito]

Find the minutes at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_TOF_Meeting%2C_May_27%2C_2011#Minutes 
and below.

   ==

GlueX TOF Meeting, May 27, 2011

Minutes

    Present:
      * FSU: Sasha Ostrovidov
      * JLab: Eugene Chudakov, Mark Ito (chair), Elton Smith, Sascha Somov,
        Simon Taylor, Ivan Tolstukhin, Beni Zihlmann


Status Report from Paul

    Paul Eugenio could not join us, but sent in a written report:

      We received the VM2000ma from 3M, and I sent 3 sheets to FIU. We
      also received the VXS crate, and have swapped it into our test
      system. We discovered that our test counter PMTs were sagging and
      separating at the light guide. This was due to using a silicon
      cookie rather than a glued pmt/light guide joint. We have glued all
      PMTs now, and Sasha is ready to restart tests.

      I have two new students joining our tof effort: Aristedis Tsaris and
      Hussein Al Goul. They have started getting familiar with our test
      set up, measuring plateaus, efficiencies, and spectra. They are
      constructing short paddles and will study single pmt readout and
      coupling of light from bar to bar, but they will now spend a few
      weeks at JLab for Hugs.


Status Report from Sasha

    Sasha reported on several items.
      * The new crate is working well. Now, all modules can be plugged into
        the single crate with no sag in the power supplies.
      * He showed [30]plots on two topics:
          1. ADC spectrum with Americium source. Paul put together a
             source/scintillator package that can be used to test PMT's as
             they arrived. The energy peak is clearly visible.
          2. Troubleshooting multiple timing peak problem. The troublesome
             multiple peaks seen previously have been eliminated. They were
             due to very large pulses coming from discharge of the cathode
             to wrapping material on the trigger phototubes.


Summary of Goals from Beni

    Beni went through the near-term goals based on discussions at previous
    meetings.
      * Repeat resolution measurements with the new components of the
        set-up, most notably with the absence of spurious peaks in the
        timing spectra.
      * Continue light guide production, and test the various design
        geometries.
           + straight vs. bent
           + small vs. large angle of taper

    He also talked to Tim and reported that Chuck Hutton will be the
    designer assigned to the TOF. Beni will talk to Chuck next week and try
    to get Chuck in touch with the designer at FSU.

Light Guide Material

    Mark brought up the plan to buy more light guide material for
    prototyping. This needs to be picked up again.

    Retrieved from
    
"http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_TOF_Meeting%2C_May_27%2C_2011"

References

   30. 
https://halldweb1.jlab.org/talks/2011-2Q/Latest%20on%20TOF%20prototype.html