GlueX PID Meeting, September 3, 2010

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Location, Time

Friday, September 3, 2010
2:00 pm EDT
JLab: CEBAF Center, Room F326/7
ESNet: 8542553
EVO: direct meeting link
Conference Group: 800-377-8846, participant code: 77438230
Slides: talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2010-09 on the JLab CUE (you have to be a member of the "halld" group). This directory is accessible from the web at .


  1. Announcements
  2. Minutes from the last meeting
  3. Time-of-Flight
    1. Prototype Status
    2. Calibration system: what is the plan?
    3. Mechanical interface to support structure: real estate planning
    4. MOU status
  4. Start Counter Status
  5. Target
    1. Refrigerator update
    2. MOU status
  6. Action Items


  • JLab: Eugene Chudakov, Hovanes Egiyan, Mark Ito (chair), Elton Smith, Sascha Somov, Simon Taylor

Elton, Eugene, Sascha, Hovanes, Simon, Mark

  • FSU: Sasha Ostrovidov

New PMT's at FSU

Sasha O. reported that two PMT's with bases from Hamamatsu have arrived, one with anode output only, one with anode and dynode output. Their gains are listed by Hamamatsu as 4.4X106 and 5.3X106. They are being tested now.


Yesterday, Elton called a meeting to discuss the TOF contruction cost and schedule, and the MOU with FSU. Elton put together a Fastrack schedule which is available on the DocDB. We are very close to moving ahead with approvals on the JLab side. Paul will send out a new version of the MOU soon.


Mark reported that Fernando Barbosa is making splitters of various proportions and inverters to send to FSU for testing.


Sasha O. gave a report.

  • He wants to compare the various signal splitting schemes.
  • The new trigger system is working and can take higher rate from the DAQ point of view. With the current trigger paddles however, the rate remains low. daq-wise.
  • The new trigger paddles are in hand. The next step is to move the test set-up out of the light-tight box, wrap the counters and light guides to make the unit light-tight, configure them to use the new higher-rate trigger scheme.
  • He has received Ben Raydo's discriminator module and is doing tests to compare performance with the Philips unit he has been using. Control software was written to do this. Initial indications are that the JLab unit is better.
  • Fernando has also promised to send a FADC unit to FSU.