July 23, 2009 Calorimetry
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Teleconference Time: 11:00 a.m. EST
- ESNET and EVO session
- Phone:
- +1-800-377-8846 : US
- +1-888-276-7715 : Canada
- +1-302-709-8424 : International
- then enter participant code: 77438230# (remember the "#"). Note: code changed 7/2/09
Contents
Items for followup from previous meeting(s)
- Procedure to avoid vaseline in Bcal fabrication needs to be approved.
- Documentation on fiber first-article
- Review calibration procedures
Documents to Review
Tentative Agenda
- Announcements
- Review of Action Items
- FCAL Update
- BCAL Fabrication
- Simulations
- BCAL Readout
- Bcal Readout Review (July 21)
- Recommendations (my interpretation)
- Develop a comprehensive test plan for evaluating "production" SiPM units
- Invest the time to test and evaluate the SiPM units before proceeding with procurement
- Discussion
- Recommendations (my interpretation)
- Other business
Minutes
Attendees:JLab: Beni, Elton, Fernando, John, Eugene, Carl, USM: Will, Sergey, Alam, ...
- Announcements
- Yuki Shiomi and Hui Yao from Kuraray are visiting the lab tomorrow. Elton will give them a tour of the accelerator and Hall B. Beni will show Yuki the lab where fibers are being tested.
- Hamamatsu has an update to the delivery schedule for their arrays: current estimate is late October. Also they request a change of the pins from 6mm down to 3mm. Fernando will check.
- BCAL Readout
- Bcal Readout Review (July 21)
- Recommendations (my interpretation)
- Develop a comprehensive test plan for evaluating "production" SiPM units
- Invest the time to test and evaluate the SiPM units before proceeding with procurement
- Recommendations (my interpretation)
- Discussion of test plan for SiPM evaluation. A straw-man plan is shown below based on discussions, and will be refined further
- Testing of electronic components (Fernando)
- Fernando showed a tentative SiPM_Dev_Schedule, showing that testing of the electronics should be completed by mid Sep.
- Output of the preamp will be one signal per array.
- Single sensor tests at room temperature (Carl)
- Check that all cells are operational by scanning across array.
- Calibrate a light source and determine a (relative) gain for each cell. Determine PDE if possible.
- Measure dark current. (Dark rate is not possible at room temperature).
- Single sensor tests at 5 deg (nominal) (Carl)
- Install Peltier on each sensor gluing the Peltier to the "hot plate" and attaching the hot plate to the sensor package using a thermal paste.
- Repeat measurements performed at room temperature, but at a nominal operating temperature
- If possible measure the dark rate in this configuration.
- Track performance of sensors during light irradiation in the fiber lab (low radiation, guestimated to be about 0.01 Gy/month)
- Place 6-8 arrays in a box with Sr source (Keep a few for reference)
- Arrays should be powered continuously
- Arrays should be operated at the nominal operating temperature (~5deg) using Peltier
- Arrays should be exposed to temperature cycles
- Output may be monitored using a picoAmmeter
- Track performance of sensors during more realistic exposures to radiation (e.g. Hall B).
- Testing of electronic components (Fernando)
- Other business