GlueX TOF Meeting, September 27, 2012

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GlueX TOF Meeting
Thursday, September 27, 2012
10:00 am EDT
JLab: CEBAF Center, F326


  1. Announcements
  2. Review of last TOF bi-weekly meeting
  3. Mechanical design
  4. Contract status -> EVMS status
  5. Calibration and Alignment
  6. Technical Design Report contribution



  1. ESNet: 8542553
  2. EVO: EVO site


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2012-3Q on the JLab CUE. This directory is accessible from the web at .



  • 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.


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.