GlueX TOF Meeting, December 20, 2012

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GlueX TOF Meeting
Thursday, December 20, 2012
10:00 am EDT
JLab: CEBAF Center, F326

Agenda

  1. Announcements
  2. Review of last TOF bi-weekly meeting
  3. Mechanical design
    1. MiniTOF
    2. TOF Gluing Fixture
    3. TOF Module Wrapper
  4. PMT testing
  5. Contract status
  6. Calibration and Alignment
  7. Technical Design Report contribution

Communication

Videoconference

  1. ESNet: 8542553
  2. EVO: EVO site

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.

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