GlueX TOF Meeting, September 27, 2012

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

Agenda

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

Communication

Videoconference

1. ESNet: 8542553
2. EVO: EVO site
   • meeting link
   • Phone bridge ID: 13 7104

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-3Q/ .

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 quides. 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.