GlueX Start Counter Meeting, July 12, 2012

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GlueX Start Counter Meeting
Thursday, July 12, 2012
10 am EDT
JLab: CEBAF Center F326/327


  1. Announcements
  2. Review minutes from previous meeting
  3. Mechanical Design
  4. Read-out Design
  5. Simulation: Start Counter Background Studies
  6. Contract

Communication Information

Video Conferencing


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2012-3Q on the JLab CUE. This directory is accessible from the web at .



  • FIU: Lei Guo
  • JLab: Eugene Chudakov, Chuck Hutton, Mark Ito (chair), Puneet Khetarpal, Tim Whitlatch, Beni Zihlmann

Prototype News

Werner Boeglin has ordered a single sheet of scintillator from Eljen, 76 mm×3 mm×60 cm. It will be sent to McNeal as raw material for five counters.

Chuck will produce new drawings to the McNeal can make the correct shape. This will be important so the new counters register well with the new SiPM boards.

Read-Out Design

Nick Sandoval reported to Mark that the some channels of the boards have been populated and basic tests have started. See the images below. Note that the SiPM's had not been soldered on when these photos were taken.

read-out board
read-out board with cables

Two of the 50 micron and two of the 100 micron SiPM's have been attached to boards. The 50 micron channels look good so far. Some adjustments to the 100 micron channels are underway.


Puneet has started HDGeant simulations to repeat the studies done by Sascha Somov for the new geometry. He is working with Sascha to validate his results now.

He also has an idea for how to do give the scintillator volume different reflective properties on different faces in his Geant4 light collection simulation. He was able to consult with the experts while attending this week's Geant4 Tutorial at JLab.


Mark sent a copy of the TOF Statement-of-Work to Werner as an example for FIU.

Mark also put together an Advanced Procurement Plan (APP) using nominal time periods for the various steps. It shows the contract being awarded in February 2013. No money can be sent directly to FIU without a contract. We will quite likely have to go faster than the APP shows.