Jun 30, 2011 SiPM Electrical and Cooling
From GlueXWiki
References
Action Items from previous meetings
- Check impact of material at low end of readout, both in the tubes for cooling fluid but also in the Cu cooling plate. Need to check effect on particle trajectories.
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Fernando will check son SEMTEC cable assemblies. -
Calculate acceptance for various heights of the flat section (Elton).
Tentative Agenda
- Announcements
- Action Items
- Schedule, reporting, and manpower (Elton)
- SiPM testing (Carl and Yi)
- Mechanical (Jim)
- Mechanical drawings (Chuck)
- Geometry (Elton)
- Temperature compensation (Jack)
- Preamp-summing (Fernando)
Minutes
Attending: Jim, Yi, John, Elton, Fernando, Chris, Chuck, Carl
- Announcements
- Action Items
- Schedule, reporting, and manpower (Elton)
- Updated EVMS spread sheet
- SiPM testing (Carl)
- Collecting equipment for production testing
- Identified 5 out of 8 QDCs.
- Computer ordered, expected by mid July
- Crate will require v430 CERN-style backplane. Need to identify one.
- Student is testing diffuse reflector. Finds uniformity +/-2% over a 4"x4" area
- Carl will be attending the New Developments in Photodetection Conference next week.
- Semtec cables
- Fernando and Chris have found coaxial assemblies which might be very useful. An off-the-shelf test piece 4' long (40pin connector) is $74.
- Assume length of cables for testing will be 25 ft
- Use 20-pin connector for each SiPM array and use only 16 pins
- Estimated delivery time is 5-20 working days
- SiPM cooling tests (Yi)
- Teaching student LabView programing for temp test
- Waiting for preamp board, everything else is ready
- Fernando and Chris will provide a working preamp board next week for testing by Yi and Jack
- Drafting NIM paper for SiPM radiation test
- Mechanical (Jim)
- Model has been updated and transfered to Chuck
- Drawings for transition board with connectors is being checked
- John: Reminder to check the possibility of enlarging the 4-40 screws to hold the cooling plate
- Mechanical drawings (Chuck)
- Light guides will be updated by removing the flat section near the base
- Geometry (Elton)
- No update
- Temperature compensation (Jack)
- Waiting for board from Fernando
- Preamp-summing (Fernando)
- Presented performance of new circuit with 2" off-the-shelf cables. Rise time optimized by adding 2 Ohm resistor to circuit.
- Present design meets the 15 ns rise time and 80 ns pulse length specification
- GlueX note almost ready and will submit to Doc Db. Elton suggested to add a table with relevant information.
- Decided to make changes to the preamp boards with the new resistance values and make available to Yi and Jack for testing.