Difference between revisions of "Apr 5, 2011 Readout"
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##** Serguei: Two test setups are being constructed 1. production, where every sensor is exposed to a standard light source. 2. small setup, measure PDE accurately by comparing response to light injected from fibers in a bundle that also illuminate a calibrated reference PMT. | ##** Serguei: Two test setups are being constructed 1. production, where every sensor is exposed to a standard light source. 2. small setup, measure PDE accurately by comparing response to light injected from fibers in a bundle that also illuminate a calibrated reference PMT. | ||
##** Yi noted that our fit to extract the PDE and gain takes quite a long time and is CPU intensive. | ##** Yi noted that our fit to extract the PDE and gain takes quite a long time and is CPU intensive. | ||
− | ## Serguei: Experimenting with a light source from " | + | ## Serguei: Experimenting with a light source from [http://www.detectors.saint-gobain.com/Brillance380.aspx "BrilLanCe"] crystal from St. Gobain |
##* Light from response to annihilation photons from a positron source. | ##* Light from response to annihilation photons from a positron source. | ||
##* Crystal deltaE/E ~ 12%. Crystal is 25 mm diameter and 25mm long. | ##* Crystal deltaE/E ~ 12%. Crystal is 25 mm diameter and 25mm long. | ||
Line 67: | Line 67: | ||
##* Initial results show that response from cells is fairly uniform and reproducible. Work is onlging. | ##* Initial results show that response from cells is fairly uniform and reproducible. Work is onlging. | ||
# Electrical/cooling (Elton) | # Electrical/cooling (Elton) | ||
+ | #* Progress continues on the mechanical setup. Drawings for prototype is complete. We have a cost estimate and fabrication is under evaluation | ||
+ | #* Fernando has completed the schematics for the preamp/summing board. Chris (Stanislav) is starting to route the board. | ||
# Geometry and light guides | # Geometry and light guides | ||
+ | #* Received 12 light guides from Plastic Craft (filling the bottom of the wedge). | ||
+ | #* Measurements have been taken and they are within about 0.2 mm of drawings. [[Light Guide Information | Summary of dimensions and some photos will be posted]]. | ||
# Simulations | # Simulations | ||
+ | #* There was some discussion of some of the simulation results, but studies are ongoing. | ||
+ | #* David has checked out the version that Andrei is using and at a first glance obtains results consistent with what Andrei showed last time. |
Latest revision as of 14:03, 7 April 2011
Teleconference Time: 11:00 a.m. EST
- ESNET 8542553 and EVO session
- JLab Phone: in CC F326 is 757-269-6337 (usual room)
- JLab Phone in CC L207 is 757-269-7084
- Phone in the Regina Videoconference Suite is 306-585-4204
- Athens Phone: in Christina's office is 011-30-210-727-6947
- Phone:
- +1-866-740-1260 : US and Canada
- +1-303-248-0285 : International
- then use participant code: 3421244# (the # is needed when using the phone)
- OR from www.readytalk.com type access code 3421244 into "join a meeting" without the # (you need java plugin)
Contents
Items for followup from previous meeting
-
Check if connections for cooling fluid can be bent radially outward to minimize affect on photons in the gap.Yes. Simulations of impact needed. - Need to get a firm number for the power dissipation in the monitoring control board (in case it is placed inside the housing box)
Documents to Review
Tentative Agenda
- Announcements
- Review of Action Items
- USM update
- SiPM update
- Regina Preliminary Tests of Hamamatsu prototype Media:ReginaLED-SiPMScan.pdf
- Electrical/cooling (Elton)
- Geometry and light guides
- Simulations
Minutes
Attending: Elton, David, Yi, John, Eugene (JLab); Will, Serguei (USM); Zisis, Andrei (UofR); Christina (Athens).
Tentative Agenda
- Announcements
- DIS Conference next week at JLab; tour of Hall D next Wednesday
- Review of Action Items
- USM update
- Received two of the "big" electronic boards (6 layers) for testing SiPMs. They are in the process of populating the boards
- SiPM sample sent from Jlab is still in customs.
- Alam has fabricated a board with 16 fast amplifiers. Should be completed in a couple of days
- Eugene: What is the rise time of the amplifier? Serguei: 4-5 ns for a 3x3 mm sensor
- Light guides
- Guides for Athens have been completed, but are still uncut and unpolished
- Guides for UofR next
- Discussions with Hamamatsu continue, although no direct reply since last e-mail
- Considering signing a contract early to avoid penalties due to currency rate changes
- SiPM update
- Yi: Carl has tested 60 samples to date
- Found one sample with anomalous cross talk (gain and PDE normal)
- Evaluating options for production testing: Could readout cells in groups of 4 to save electronics and check p.e. widths to evaluate uniformity.
- Serguei: Have we checked the cross talk between cells in the array? Yi: No, but we should do that.
- Elton: How difficult would it be for JLab to copy the USM production test setup? Will: Unclear until the setup is verified to work. Serguei estimates it will take about one month to check the system.
- Yi: How does USM intend to measure PDE and gain?
- Serguei: Two test setups are being constructed 1. production, where every sensor is exposed to a standard light source. 2. small setup, measure PDE accurately by comparing response to light injected from fibers in a bundle that also illuminate a calibrated reference PMT.
- Yi noted that our fit to extract the PDE and gain takes quite a long time and is CPU intensive.
- Serguei: Experimenting with a light source from "BrilLanCe" crystal from St. Gobain
- Light from response to annihilation photons from a positron source.
- Crystal deltaE/E ~ 12%. Crystal is 25 mm diameter and 25mm long.
- PMT signal has rise time of 15 ns and pulse length of 100 ns.
- Regina Preliminary Tests of Hamamatsu prototype Media:ReginaLED-SiPMScan.pdf
- Using a computer controlled platter to align a fiber guiding light from an LED to a single cell.
- Using Hamamatsu array from original batch
- Recorded response on an oscilloscope of all 16 cells.
- Initial results show that response from cells is fairly uniform and reproducible. Work is onlging.
- Yi: Carl has tested 60 samples to date
- Electrical/cooling (Elton)
- Progress continues on the mechanical setup. Drawings for prototype is complete. We have a cost estimate and fabrication is under evaluation
- Fernando has completed the schematics for the preamp/summing board. Chris (Stanislav) is starting to route the board.
- Geometry and light guides
- Received 12 light guides from Plastic Craft (filling the bottom of the wedge).
- Measurements have been taken and they are within about 0.2 mm of drawings. Summary of dimensions and some photos will be posted.
- Simulations
- There was some discussion of some of the simulation results, but studies are ongoing.
- David has checked out the version that Andrei is using and at a first glance obtains results consistent with what Andrei showed last time.