GlueX TOF Meeting, August 29, 2013

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GlueX Time-of-Flight Meeting
Thursday, August 29, 2013
10:00 am EDT
JLab: CEBAF Center, F326/327


  1. Announcements
    1. No contract extension for machining needed
  2. Review of last TOF bi-weekly meeting
  3. Construction news
  4. Notes on module testing
  5. Installation plan and document



  1. ESNet: 8542553

Desktop Sharing

  1. Go to
  2. In the "join a meeting" box enter the code: 1833622
  3. Fill in the participant registration form.


To connect by telephone:

  1. dial:
  2. enter access code followed by the # sign: 1833622#


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2013-3Q on the JLab CUE. This directory is accessible from the web at .



  • FSU: Paul Eugenio, Sasha Ostrovidov
  • JLab: Eugene Chudakov, Mark Dalton, Chuck Hutton, Mark Ito (chair)


  • We have dropped the idea of doing a contract extension for the machining of support structure parts at FSU. Incidental charges will be covered by JLab attributed to the support frame activity per original plan.
    • Most, if not all, of the drawings for pieces of the support structure to be machined at FSU are ready for signature. Chuck will send the ones for aluminum collars and the light guide holders ("Swiss cheese") pieces to Randall so he can estimate raw material needs.
  • Maurizio is out of town, but he left all of the lab set-up looking good.

Review of Minutes from the Last Meeting

We reviewed the minutes from the August 1st meeting. There were not significant comments.

Construction News

  • FSU had made great progress on the gluing issue, PMTs to light guides. By eye, some joints had dull spots on the glue joints. In these cases, the tubes were removed and the guides sanded, polished and re-glued.
  • One crate of modules has been packed for shipment.
    • More wood for crates will be purchased now that the design is final.
  • Each modules is being labeled so that the PMTs and scintillator can be identified if needed later. The marking will allow the installation location to be read off the modules. The plan is to pack modules with similar installation location together.
  • Testing is proceeding, six modules at a time.
    • The recent TDC failure stopped production for a while. The module was not recognizing a front panel trigger. The problem appears to be intermittent. It may depend on how the module is seated in the crate. Testing has re-started with instructions not to touch the crate. JLab is sending a replacement/spare to FSU.

Cosmic Test Studies

Sasha presented recent results on a variety of topics coming from the cosmic tests using six modules. See his web page for details. The sections of his page are:

  1. FADC signal shape
  2. High-voltage (gain) balancing
  3. Time-walk corrections
  4. Possible data selection cut
  5. Mystery of trigger timing jump

Sasha is also working on automating some of the steps in the module testing procedure.