Mar 25, 2010 Readout
From GlueXWiki
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.
Contents
Items for followup from previous meeting
- Input/Decisions needed to finalize Bcal readout requirements (See also GlueX-doc-1373).
- Define set of simulations run needed to determine dynamic range of SiPMs
- Serguei agreed to send out a testing proposal for comments, including preliminary circuit designs and list of available equipment at USM for reference.
Documents to Review
Tentative Agenda
- Announcements
- Review of Action Items
- Update - USM
- Simulation runs
- 7.93-mm top Al plate (with correspondent glue pockets) is added into FLUKA geometry
- Magnetic Field Map ANSYS 20081209-1_1500.dat; linear interpolation between the grid points
- Double-exponent formula for light attenuation; about 20-25% effect for close-to-readout-end hits
- Ready to start the simulation as soon as the Momentum-Angle table will be specified.
- Pythia Plots: Media:mom_gamma_log_BCAL.png and Media:momVStheta_gamma_log.png
- Geometry
- SiPM Radiation Hardness Test (Yi)
- SiPM - Testing
- SiPM - production testing
- Schedules
- Light guides
Minutes
Attending: Fernando, Yi, Chuck, Tim, Beni, Elton, Sasha (JLab); Serguei (USM); Zisis, George, Andrei (UofR)
- Announcements
- Review of Action Items
- Update - USM
- Purchasing new equipment and setup
- CAEN equipment
- Design/buid box for SiPM test including thermal stabilization
- Establishing procedure to measure VI curves
- Finding that significant stabilization time for sensor required of about 30 min. Two component exponential with tau1~ 5 s and tau2~30-40 min. Will have results for next meeting.
- Elton asked about noise from LED. Serguei said that this is simply low level noise (~2mV) in the box, which made it difficult to have sensitivity to single p.e. peak.
- Finding different rise times using different amplifier impedance. Mentioned that 3x3 mm2 unit has capacitance of 300 pf (Fernando verified this at the end of the meeting).
- Amplifier circuit
- Fernando mentioned that Carl has received some 1mm2 samples from Hamamatsu for evaluation. They will start using the amplifier that Stepan used in Hall B. Fernando will develop a circuit for these single-cell units. He thougth that a common circuit could be used for the 1mm2 and the 9mm2 units.
- Testing of array at UofR. They are setting up the tests. Elton mentioned that we should fill out a loan agreement.
- Purchasing new equipment and setup
- Simulation runs
- Setup so far
- 7.93-mm top Al plate (with correspondent glue pockets) is added into FLUKA geometry
- Magnetic Field Map ANSYS 20081209-1_1500.dat; linear interpolation between the grid points
- Double-exponent formula for light attenuation; about 20-25% effect for close-to-readout-end hits
- Ready to start the simulation as soon as the Momentum-Angle table will be specified.
- Discussion of runs needed
- Pythia Plots: Media:mom_gamma_log_BCAL.png and Media:momVStheta_gamma_log.png
- Downstream: Tentative agreement to use Emax=2.5 GeV. Blake to check distribution for eta-pi0 distribution. For the angle, Elton suggested 30 cm from the downstream end, rather than the angle for the maximum depth. Regina will check effect of losses out the front.
- Pythia Plots: Media:mom_gamma_log_BCAL.png and Media:momVStheta_gamma_log.png
- Setup so far
- Geometry
- SiPM Radiation Hardness Test (Yi)
- SiPM - Testing
- SiPM - production testing
- Schedules
- Light guides