GlueX TOF Meeting, February 14, 2013

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GlueX TOF Meeting
Thursday, February 14, 2013
10:00 am EST
JLab: CEBAF Center, F326/327


  1. Announcements
  2. Review of last TOF bi-weekly meeting
  3. Collaboration Meeting
    • Friday February 22, 2013
    • 13:30 Session IVa (75) --- TOF and PID - (Organizer: M. Ito)
  4. Construction status
  5. Contract status


  1. MiniTOF
  2. TOF Gluing Fixture
  3. PMT testing



  1. ESNet: 8542553
  2. SeeVogh: SeeVogh site


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2013-1Q on the JLab CUE. This directory is accessible from the web at .



  • FSU: Paul Eugenio, Sasha Ostrovidov
  • JLab: Chuck Hutton, Mark Ito (chair), Tim Whitlatch, Beni Zihlmann

Mini-TOF Status

There was a minor problem with the construction drawings for the frame at FSU: they assumed counters 255 cm long (an old dimension) when the actual dimension is 254. This was easily remedied by slotting the attachments holes for the appropriate frame parts. The drawings at JLab.

There was a slight interference with the clamps and the curved part of the light guide. FSU simply trimmed an edge of the the clamp to proceed. This change also needs to be fed back into the drawings at JLab.

Since the end of the scintillators, while being glued, are almost 10 feet above the floor, there is a scaffolding being built next to the gluing fixture to allow access for work. Some additional design effort is going into personal safety while mounting the scaffold as well as general mechanical stability.

An old scintillator bar, from previous prototypes, has been cut up to serve as blanks for the two additional half-length counters needed to complete the mechanical assembly, opposite the actual first-article modules. They will be wrapped. A decision on whether to instrument them has not been made.

Construction Status

Four modules are glued and ready for wrapping. More will be glued today. Wrapping will start tomorrow.

Maurizio Bertoldi, the construction manager for this project, has started work at FSU.

Fifty-five light guides have been done, machined and polished. A change in the procedure now has the machine shop sand the ends with 400 grit paper to prepare the surfaces for gluing. Previously this was done in the lab.

PMT Testing

All 194 PMTs have have gone through gain testing. All are good. There are few that Sasha would like to re-measure so the latest standard procedure can be applied to them.

Scintillator Testing

Sasha reported that the results presented last time had a labeling error, and that the modules with the reduced attenuation length were the two half-length modules, contrary to expectations. The issue is being investigated. Beni agreed to consult on this matter.

Readiness Review

The readiness review is scheduled for Friday, March 8. Beni, Chuck, and Bruce Lenzer will be traveling to FSU.


Paul and Mark have been discussing the system for invoicing and progress reporting now that contract work had started. The procedure needs to be systematized a bit.