[Halld-pid] Time-of-Flight Meeting Minutes, September 27, 2012

[Mark M. Ito]

Folks,

Find the minutes below and at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_September_27,_2012 
.

   -- Mark
_____

GlueX TOF Meeting, September 27, 2012
Minutes

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

Mini-TOF Construction

    Paul reports that construction materials are coming in. There was a
    delay on a large steel channel, which we are getting from a company
    near the Lab. We had to buy a 20 foot piece though only 10 is needed.

TOF Procurements

      * Materials are arriving for the gluing jig.
      * Specifications for the scintillator were sent to Eljen and Saint
        Gobain. Paul has only heard back from Eljen.
      * The AJ200 scintillator (new designation) is being produced at Eljen
        on revamped machines. We can get scintillator from them sooner than
        anticipated, within six weeks of order.
      * Additional quotes were requested for UVT acrylic rods. Paul found a
        company that can provide the same material as the vendor we have
        been using, but with a better delivery schedule. 240 feet can be
        delivered in six weeks. Two rods have been purchased from the new
        company. They will be evaluated. Elton suggested using a laser and
        visually observing the amount of scattering to do a quick
        comparative/qualitative evaluation with respect to the material
        already in hand.
      * Paul is trying again to get ESR daylighting film from 3M in long
        rolls rather than small sheets.

TOF Construction

      * The gluing jig has been redesigned to allow gluing of nine modules
        at a time, with adequate spacing between modules.
      * Ian Winger is working on a jig to help with smoothing the wrapping
        operation. A U-channel will hold the wrapping and scintillator.
      * Paul has been doing tests with RTV for mounting attaching the PMT's
        to the light guides. He got two types, RTV 615 and RTV 655, from
        Momentum Products (a spin-off of GE silicon). RTV 615 has been used
        at other experiments. Initial tests look good; a twenty pound
        weight was suspended from the far end of the PMT and the joint
        held. The PMT was removed with a razor blade and the surfaced
        cleaned up nicely with Kimwipes and silicone solvent.

Contract

    Mark and Paul will get together after the meeting by phone to discuss
    the Change Request for supporting EVMS accounting now that the contract
    is in place.

    Retrieved from
"https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_September_27,_2012"


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