[Halld-pid] Minutes, Time-of-Flight Meeting, January 19, 2012

[Mark M. Ito]

Folks,

Find the minutes at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_19,_2012#Minutes 
and below.

   -- Mark
   _____
GlueX TOF Meeting, January 19, 2012

Minutes

    Present:
      * FSU: Paul Eugenio, Sasha Ostrovidov
      * JLab: Eugene Chudakov, Chuck Hutton, Mark Ito (chair), Tim
        Whitlatch, Beni Zihlmann

Phototube Purchase

    Beni reviewed [20]the proposal he floated last month along with [21]the
    subsequent discussion on the email list (see the items in the "PMT
    choice for TOF" thread). We agreed that, all things considered, we
    should go ahead an adopt his proposal and initiate the purchase of the
    ten-stage tubes for the entire array. Some things we need to bear in
    mind:
      * Eugene suggested that we have amplifier ready if needed (see
        "subsequent discussion").
      * We still want to test eight-stage tubes. FSU has a couple of these
        and will pursue these tests.
      * We want to have a mechanical design that allows replacement of
        tubes in the high-rate area with reasonable effort during a
        shutdown period.

    Mark will initiate writing of the PR.

Mechanical Design

    This morning there was a phone conference to discuss issues with the
    light guides for the half-width counters. Present were Paul Eugenio,
    Kurt Koetz, Randall Smith, and Ian Winger at FSU and Chuck Hutton at
    JLab. They agreed on:
      * adding 1 cm flat sections, as we have for the full-width guides
      * reducing the over-all length by 4 cm to avoid interference with the
        carriage

    Another meeting is scheduled for Tuesday, January 24 at 9:00 am to
    discuss progress.

Contract

      * Paul has starting on construction documentation.
      * Mark has not heard anything from Procurement on the RFP. He will
        check on progress.

Prototype Status

      * Sasha replaced a trigger PMT and using a new propagation speed
        calibration, he gets 98 ps resolution, 90 ps if he restricts
        triggers to a narrow region at the center of the counter. The
        calibration was obtained by taking data with an americium source at
        various positions along the counter.

Construction

      * Paul showed us the first light guide with the latest design.
      * Ian is working on structure for gluing together three modules at a
        time. The system will allow rotation by 180 degrees.

Action Items

      * Initiate procurement of the 10-stage tubes.
      * Test the 8-stage tubes.
      * Check on the status of the Construction Contract.

    Retrieved from
    
"https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_19,_2012"

References

   20. 
https://mailman.jlab.org/pipermail/halld-pid/2011-December/000267.html
   21. 
https://mailman.jlab.org/pipermail/halld-pid/2011-December/thread.html#start

-- 
Mark M. Ito
Jefferson Lab (www.jlab.org)
(757)269-5295