[Halld-pid] GlueX PID Meeting Minutes, Oct. 29, '10

[Mark M. Ito]

  Find the minutes at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_PID_Meeting%2C_October_29%2C_2010#Minutes 
and as text below.

GlueX PID Meeting, October 29, 2010
Minutes

      * FSU: Sascha Ostrovidov
      * JLab: Eugene Chudakov, Mark Ito (chair), Rory Miskimen, Elton
        Smith, Sascha Somov, Simon Taylor, Beni Zihlmann


Target Refrigerator Capacity

    Chris Keith contacted Mark saying he had contacted the company that
    makes the refrigerator he has identified. Liquid helium should be no
    problem with this unit.

FSU/JLab MOU

    The MOU between Florida State and JLab has passed through the
    Concurrence Chain and has been signed by all parties in Tallahassee. It
    is on its way to JLab for signatures here.

UMass MOU

    Rory, Elton, and Mark have agreed on a final draft. That has been sent
    to Glenn Young for review. After that it goes to Allison Lung and then
    on the to Concurrence Chain.

TOF Prototype Status

    Sasha O. gave us a report on progress at FSU.
      * The machine shop is making a frame for the four-paddle prototype
        configuration.
           + There was an issue on how to hold the two small paddles in the
             array. It was decided that the short paddles will be between
             the long ones.
      * At the time of the last meeting there was a problem with half of
        the events having missing TDC hits.
           + Often, the overflow bit set on these channels. Sasha spoke
             with Ed Jastrzembski. The overflow bit is only set if there 16
             hits in the TDC window, which in this case is 400 ns.
           + Various things were tried:
               1. reducing trigger window to 50 ns
               2. moving signals to other chips
               3. increasing threshold on the discriminator
           + The overflow problem is largely gone now.
           + There does remain a 10% change that a TDC hit is missing in
             any given event. This has not been understood.

    There was a lot of discussion on various things that could be tried.
    There seems to be some source of high frequency noise in the system
    that needs to be tracked down.

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