Mar 11, 2010 Readout

Teleconference Time: 11:00 a.m. EST

• ESNET and EVO session
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Items for followup from previous meeting

1. Check with Hall B regarding U. of Washington neutron detectors (Elton). Neutron detectors were returned to UofW.
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 Will do this on output of generated showers
   • Possibility of using air gap for SiPM coupling to light guide (Elton to write up results)
   • Finalize shapes of "Winston guides" Basic information in GlueX-doc-1432.

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Update - USM
4. Simulation runs
5. Geometry
6. SiPM - SiPM Radiation Hardness Test (Yi)
7. SiPM - Testing (Fernando)
   • Planning
   • Test station development with measurement parameters
   • Review & acceptance of test station
   • Preliminary verification tests & analysis of test station
   • Fabrication of two additional test stations for UR and JLab
   • Responsibilties
8. SiPM - production testing
   • Schedules
9. Light guides

Minutes

Attending: Serguei, Will, Alam (UMS); Elton, Beni, Pedro, John, Fernando, Chuck, Tim, Eugene, Carl, Yi, Sasha

1. Announcements
   1. USM is closed due to problems with water supply. 7.2 aftershock felt.
   2. Due to JLab network problems, connections were lost several times.
2. Review of Action Items
   • Plans for most of the action items have been made, even though final decisions on Bcal readout parameters have not been reached yet.
3. Update - USM
4. Simulation runs
   1. Still need to complete the list of simulation runs that will be used for determining dynamic range.
5. Geometry
   1. The concept for mechanical support was provided by Chuck and Tim
      • Glue light guides into a solid group structure
      • secure light guide group at base and near sensor
   2. Discussion of concept
      • Precisely how the guides are isolated from each other was discussed. Carl mentioned that Fermilab has a procedure for depositing a white TiOxide layer on extruded scintillator and this could be used at the base where light guides are connected
      • The uneven plane of the sensors needs to be adjusted during assembly. Fernando has a concept for a flex PC board that attaches to a custom socket.
      • Serguei mentioned that the Hall B Inner Calorimeter has a flexible connector schedule which worked well (although with more space)
      • Fernando: Need to check the stacking tolerances and make a trial run to see how well it can work.
6. SiPM - SiPM Radiation Hardness Test (Yi)
   1. Yi has everything in hand for the test except for an oscilloscope. Beni volunteered to lend one for the test (Thanks!)
   2. All units are remotely controlled
   3. Neutron detectors are already in Hall A and can be movec to the location of the measurements. Need to get a calibration (however imprecise) from Radcon for the neutron counter
7. SiPM - Testing (Fernando)
   1. Fernando emphasized that a plan for testing of the SiPMs is needed, as well as coordinating the efforts at JLab, UofR and USM. Coordination should include the following elements for initial tests and schedules for production testing
      • Planning
      • Test station development with measurement parameters
      • Review & acceptance of test station
      • Preliminary verification tests & analysis of test station
      • Fabrication of two additional test stations for UR and JLab
      • Responsibilties
   2. Alam has started laying out a plan for testing 16 arrays perhaps with multiple setups
   3. Equipment used at the different sites may not be identical.
   4. Will: For the optical test setup, any amplifer design can be used, in particular they can take a JLab design. However, individual outputs from each cell within the array should be available for diagnostics.
   5. Serguei agreed to send out a testing proposal for comments, including preliminary circuit designs and list of available equipment at USM for reference.
8. Light guides
   • No report