Difference between revisions of "May 31, 2011 Readout"
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## Prototype light guides from Chile are not yet ready, having some difficulties with cutting the two machined light guides apart. They will also need to be polished once apart. | ## Prototype light guides from Chile are not yet ready, having some difficulties with cutting the two machined light guides apart. They will also need to be polished once apart. | ||
##* Serguei will send an internal report describing status. | ##* Serguei will send an internal report describing status. | ||
+ | ##* [[TLG production status 30052011.pdf Light Guide Production Status at USM]] Serguei sent me this file following the meeting. | ||
# Simulations | # Simulations | ||
## Regular meetings on Thu at 11:00 for a small group to specifically address the effect of segmentation on reconstruction. | ## Regular meetings on Thu at 11:00 for a small group to specifically address the effect of segmentation on reconstruction. |
Revision as of 13:22, 31 May 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)Less than 250 microW/ board. -
SiPM: check cross talk between cells (Yi and Carl)
Documents to Review
Tentative Agenda
- Announcements
- Review of Action Items
- USM Update
- SiPM update
- Electrical/cooling (Elton)
- Geometry and light guides
- Simulations
Minutes
Attending:Tim, David, Beni, Eugene, Elton, Yi (JLab); Christina, George, Pavlos (Athens); Alam, Serguei (USM); Andrei (UofR)
- Announcements
- Review of Action Items
- Monitoring
- Several exchanges with Kappos last week. Considering the use of flex-boards instead of ribbon cable. Factory in England, but should be practical. The flexible connections would be used for bus and hard PCBs for LED boards as before.
- New LEDs received. New measurements in progress. Report at next meeting
- Need to determine distance between boards to order cables. Elton: should wait till connection between LED and light guide in case this has an effect on geometry.
- USM Update
- Populated board containing pre-amps and multiplexors.
- Measured signals in response to static inputs, to optimize parameters of pre-amp including output impedance and gain.
- Eugene: What is the distance between the sensor and the pre-amp. After some discussion, Serguei clarified the distance to be about 10 cm. The scope traces in the attached file were measured with 4-5 cm long wire leads.
- Dark Box
- Adding AC system to stabilize both temperature and humidity in test room.
- Populated board containing pre-amps and multiplexors.
- SiPM update
- SiPM and electronics was tested with no degradation up to 0.5 T, as expected.
- Twenty SiPM arrays have been reserved for shipment to UofR (ten units) and USM (ten units). Will prepare for shipment.
- Electrical/cooling (Elton)
- Fernando is testing an electronic unit (3 pre-amps and one summing circuit). The board is working well, except for a 24 ns rise time that needs to be investigated.
- Jack will use the same board, which also contains the bias/temp stabilization circuit, to test the feedback loop.
- Mechanical parts for cooling tests were ordered and delivery expected end of May. Need to check on status.
- Geometry and light guides
- Drawings are being made of the new phi-symmetric light guide configuration.
- Prototype light guides from Chile are not yet ready, having some difficulties with cutting the two machined light guides apart. They will also need to be polished once apart.
- Serguei will send an internal report describing status.
- TLG production status 30052011.pdf Light Guide Production Status at USM Serguei sent me this file following the meeting.
- Simulations
- Regular meetings on Thu at 11:00 for a small group to specifically address the effect of segmentation on reconstruction.