[Halld-pid] Time-of-Flight Meeting Minutes,

[Mark M. Ito]

Find the minutes at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_17,_2013#Minutes 
and below as text.

    ___

GlueX TOF Meeting, January 17, 2013
Minutes

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

Construction Status

ESR material

    FSU has received a roll of ESR material, not the standard 3×2 foot
    sheets, but in a roll 8 inches × 1000 feet. Originally the product came
    with an adhesive, but that is not present on the roll. This will reduce
    the thickness of material between counters. The ESR thickness is about
    2 mils.

Light Guide Manufacturing

    Light guide status:
      * 90% partially milled
      * 25% fully milled
      * 10% polished

    It should take about another month for machining of all the light
    guides. Next week FSU will assemble the mini-TOF using the
    first-article modules.

Scintillator Purchase

      * FSU has received all the scintillator in the first-article batch,
        six modules.
      * They are in communication with Eljen about the remaining
        scintillators. Eljen is asking if we can get by with about a dozen
        of the long bars which are short by 1/8 inch.
      * We discussed whether the design of the support structure can
        accommodate shorter bars and we felt that it could. If there are
        surprises we could manufacture special lightguides, 1/16 inch
        longer to compensate.
      * We decided to accept the short modules from Eljen.

Mini-TOF Construction

    Construction should begin next week. By the next meeting have Paul will
    have photos of the structure. The support structure is done. Assembly
    will be done on sawhorses. The modules will then be mounted on a
    rotating support stand.

PMT Testing

      * Yesterday FSU received the final shipment of PMTs from Hamamatsu.
      * The test computer died, but was revived yesterday.
      * Status of tests:
          1. LED illumination to measure gains
          2. "Americium source" (100 PMTs done)
          3. "Cesium-iodide source" with spectrum analyzer (60 PMTs done)
          4. noise measurements (not started)
      * FSU received CAEN HV module loaned from JLab.

Contract

    We will aim for a readiness review at the end of February, after the
    collaboration meeting. It was suggested that during the review that we
    have a session of procurement folks from JLab and FSU to discuss
    details of invoicing and payment.

    We need a way to map into the EVMS system. Beni will show Mark how it
    was done for the CDC from Carnegie Mellon.

Calibration and Alignment

    The GlueX is note still in the works.

TDR

    The TDR section on the time-of-flight is on hold for now. Paul has been
    concentrating on getting the construction going.

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