GlueX TOF Meeting, December 20, 2012
GlueX TOF Meeting
Thursday, December 20, 2012
10:00 am EDT
JLab: CEBAF Center, F326
Contents
Agenda
- Announcements
- Review of last TOF bi-weekly meeting
- Mechanical design
- MiniTOF
- TOF Gluing Fixture
- TOF Module Wrapper
- PMT testing
- Contract status
- Calibration and Alignment
- Technical Design Report contribution
Communication
Videoconference
- ESNet: 8542553
- EVO: EVO site
- meeting link
- Phone bridge ID: 15 1627
Slides
Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-4Q
on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-4Q/ .
Minutes
Present: FSU: Sasha Ostrovidov JLab: Chuck Hutton, Mark Ito (chair)
PMT Testing
- There are four undergraduates working on testing PMTs now.
- 130 PMTs have been received (batches 1, 2, and 3).
- All of them have been tested with an LED, with gain measured via a visible single-photoelectron peak. All tubes passed.
- 70% of them have been tested with an americium source to look at photocathode efficiency
- 10% of them have been tested with a cesium source on a sodium iodide crystal.
Wrapping Material
Paul Eugenio has succeeded in negotiating purchase of rolls of ESR material from 3M, rather than in the 2×3 foot sheets that were originally offered. The rolls are 8 inches wide and about 1000 feet long. Also, there will be no adhesive layer attached to the material; the total thickness will be 1 mil. The purchase order has already been sent to 3M. Shipment is expected sometime in January.
Scintillator Bars
received 6 scintillator bars 2 regular 2 narrow and 2 short
some bars are out of tolerance by 1 or two mils above 5 mil tolerance
working on 3rd batch produced 76 normal bars 1/8" inch short , 12 of them not accepted yet
sasha setting up for scintillator measurements put into dark box spring loaded mechanism to hold pmts Sr source at various points, get adc and tdc light output spectrum a mystery
Mini-TOF Assembly
all parts made for mini-tof mid january start gluing, finish tresting this week start early january gluing ESR
Design Work
chuck is putiing mini tof ideas into final design
Chuck thinks eyes-on would be a good idea.