Jun 4, 2009 Readout

Teleconference Time: 11:00 a.m. EST

• EVO session
• Phone:
  • +1-800-377-8846 : US
  • +1-888-276-7715 : Canada
  • +1-302-709-8424 : International
  • then enter participant code: 39527048# (remember the "#")

Items for followup from previous meeting

1. Check arrival of Bcal section from Edmonton
2. Will to propose detailed plan for prototyping for feedback. Sketch of test setup could help visualization.
3. Elton to provide reference light guide geometry for GEANT3.
4. Sasha will send a link to studies of energy deposition in the Bcal and present his work next time. See June 11, 2009 Calorimetry

Tentative Agenda

1. Announcements
2. Review of Action Items
3. USM report
4. Discussion of readout options
   • Budgets
   • Specifications for SiPM Readout Electronics
   • FM light guides (See GlueX-doc-1287)
   • Mechanical keep-out zones
   • Timeline for review - Reviewer Stefano Miscetti (tentative July 21)
5. Prototyping
6. Simulations
   • Andrei will complete simulations of number of visible photons per GeV.
7. Discussions on MOU with USM

Minutes

Attending: USM: Alam, Will, Eduardo,... JLab: Elton, Eugene, Beni, UofR: Zisis, Andrei, George?

1. Announcements
2. Review of Action Items
   • All completed except for one item.
   • Zisis has found a way to ship a Bcal section to Chile, and they will ship COD.
3. USM report
   • Eduardo: Compiling report based on other documents. The report is on their internal wiki, and a link to the GlueX wiki will be made.
4. Discussion of readout options
   • Budgets - no update. Elton will be working on this over the next week.
   • DRAFT Specifications for SiPM Readout Electronics. Fernando has provided this to Hamamatsu and SensL. We haver received some clarification questions, but otherwise they do not have any major concerns.
   • FM light guides (See GlueX-doc-1287)
     • Elton has summarized based work reported last week into a a draft document GlueX-doc-1287 on the portal.
     • Two extreme lengths were simulated (outer top) and (bottom inner) for the upstream and downstream Bcal locations.
     • The calculated light guide efficiency for the inner segment is about 30%, which is to be compared to 80% for SiPMs.
     • Andrei: Backgrounds due to Cerenkov production in the light guides needs to be considered.
     • Will: back of the envelop estimates should be able to evaluate the level at which these backgrounds contribute.
     • Will: Cerenkov backgrounds interfered with calibration proceedures in CLAS and should be checked in this case.
     • Elton, Sasha will discuss priorities and resources for simulation with Matt Shepherd tomorrow afternoon.
   • Mechanical keep-out zones
   • Timeline for review - Reviewer Stefano Miscetti (tentative July 21)
     • No new input on review. Elton will confirm date with Miscetti.
5. Prototyping
6. Simulations
   • Andrei and Irina have completed simulation files for 40, 100, 200,400, 600, 1000 MeV showers and generated n-tuples. The files are available at /group/halld/Users/semenov/fluka. Feedback on their usefulness is requested.
   • Andrei will send out a short note to the listserver describing the files and variables.
7. Discussions on MOU with USM
   • These details will be left to offline discussion.