GlueX TOF Meeting, March 29, 2012

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Thursday, March 29, 2012
10:00 am EDT
JLab: CEBAF Center, F326/327


  1. Announcements
  2. Review of previous meetings
  3. Mechanical design: Tim, Chuck
  4. Prototype status: Paul, Sasha
  5. TDC choice: all
  6. Contract Status: Mark, Paul
  7. Calibration and Alignment
  8. Technical Design Report contribution



  1. ESNet: 8542553
  2. EVO: EVO site


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2012-1Q on the JLab CUE. This directory is accessible from the web at .

Chairman's Cell Phone




  • FSU: Sasha Ostrovidov
  • JLab: Eugene Chudakov, Chuck Hutton, Mark Ito (chair), Tim Whitlatch

Contract Status

Mark reported that the FSU proposal was received by Procurement. A technical review committee has been formed:

  • Dan Carman
  • Mark Ito
  • Elton Smith
  • Beni Zihlmann

We should be getting materials from Procurement this afternoon.

PMT Purchase

Hamamatsu has received the RFP from Procurement and submitted a set of questions. Mark sent answers back to Procurement.

Calibration and Alignment

Mark raised the collaboration-wide effort to come up with a calibration plan for each detector subsystem. We need to start work on this for the TOF soon.

Technical Design Report Contribution

Mark mentioned the effort to write an up-to-date Technical Design Report for GlueX. He is hoping that Paul will be able to take a look at the TOF section.

Mechanical Design

Chuck showed us updated drawings of the support structure. He added details of the steel tube positioning scheme. These changes forced the collar to attach to the tube farther out-board. This would make tube replacement somewhat more complicated.

Eugene supported Elton's suggestion that the C-channel "clamp" miss the scintillator and hold the counters by the light guides only.

We talked about an alternate scheme where the light guides are supported near their midpoint, using the bars that currently connect the C-channels on the out-board edge. This scheme is complicated by the angle of the light guides at that position. It also does less to ensure alignment of the scintillator, counter-to-counter. It avoids having the "clamp" holding all the counters with the clamping pressure coming only at the ends of the C-channels. Tim and Chuck will explore this options further.