Feb 25, 2010 Readout

Teleconference Time: 11:00 a.m. EST

• ESNET and EVO session
• Phone in CC F326 is 757-269-6337
• Phone:
  • +1-800-377-8846 : US
  • +1-888-276-7715 : Canada
  • +1-302-709-8424 : International
  • then enter participant code: 77438230# (remember the "#"). Phone connection only upon request.

Items for followup from previous meeting

1. Testing of new cal modules to measure light output and determine the range of phoelectrons expected (George to propose test plan)
2. Input/Decisions needed to finalize Bcal readout requirements (See also GlueX-doc-1373).
   • Specify the normalization and dynamic range for the number of photons/GeV in showers (Andrei to summarize MC results)
     • charged particles should also be included into the evaluation
   • Decide on specific grouping for SiPM sums
   • Possibility of using air gap for SiPM coupling to light guide (Elton to write up results)
   • Finalize shapes of "Winston guides"

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Update - USM
   • First tests of SiPMs (Serguei)
4. SiPM - update
5. Geometry
6. Light guides
   • For reference: top = 2.525 cm, side =2.0 cm, bottom=2.4026 cm, cone to radius=1cm, Winston cone to radius=0.6cm (GlueX-doc-1077), efficiency=81%.
   • Preliminary results for collection efficiency for trapezoidal light guides (inner outside top geometry) with air gap:
   • Intput: top = 2.525 cm, side =2.0 cm, bottom=2.4026 cm, length = 8 cm
   • output: 1.2cm x 1.2 cm square
   • Ratio of input/output areas = 0.29
   • 1 mm lucite transition piece: efficiency = 87%.
   • 1 mm air gap, efficiency = 45%.
7. Discussion - MOU with USM

Minutes

Attending: