Difference between revisions of "Jul 7, 2011 SiPM Electrical and Cooling"
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== Action Items from previous meetings == | == 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. | # 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. | ||
# Check the possibility of enlarging the 4-40 screws to hold the cooling plate (Jim) | # Check the possibility of enlarging the 4-40 screws to hold the cooling plate (Jim) | ||
− | # Update the light guide drawings to eliminate the flat section (Chuck) | + | # <strike> Update the light guide drawings to eliminate the flat section (Chuck) </strike> |
== Tentative Agenda == | == Tentative Agenda == | ||
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== Minutes == | == Minutes == | ||
− | ''Attending: | + | ''Attending: Fernando, Chris, Jim, Chuck, John, Yi, Eugene, Elton, Jack |
+ | |||
+ | * Note: due to network disruptions this week, the minutes were not posted to the wiki till 7/13. | ||
+ | |||
+ | # Electrical preamp/sum (Fernando | ||
+ | ## Three tested boards ready. | ||
+ | ##* Chris: need to coordinate with Jack to provide requested cabling | ||
+ | ## Need to determine timing response of this system to approve design | ||
+ | ##* Sasha has contacted Vitali to see if they can use his setup to measure the time response of this circuit. | ||
+ | # Mechanical (Jim) | ||
+ | ## Screws size for holding fixtures can likely be changed from #4 to #6 screws | ||
+ | ## Cooling measurements | ||
+ | ##* Checking flow of dry nitrogen | ||
+ | ##* Thermocouples installed at inlet and outlet of cooling plate | ||
+ | ##* Using 20% propylene glycol mixture, useful to -10 C | ||
+ | ##* At low flow rates the input temperature is about 17C. Moved flow meter to back side and remeasure | ||
+ | ##* Eugene: Concern about rapid temperature fluctuations. Need a buffer to smooth out temperature changes | ||
+ | ##* Discussion regarding options to do this. Will measure time constant for the fluctuations. | ||
+ | # Drawings (Chuck) | ||
+ | #* Updated drawings to latest design. They are being checked | ||
+ | # SiPM testing (Yi) | ||
+ | #* Writing paper on radiation tests, in final stages | ||
+ | #* Will help Sasha with timing tests | ||
+ | # Electronics bias/temp comp (Jack) | ||
+ | #* Control circuits are almost ready, not yet connected to scope. May need to get feedback from Yi | ||
+ | # Discussion on temperature stab for production testing | ||
+ | #* Decided to make measurements at room temperature, but would like a stable environment | ||
+ | #* Need a thermistor at each SiPM to monitor temperature | ||
+ | #* First article stabilization time was about 30 min | ||
+ | #* Fernando: could use a single SiPM which is measured repeatedly and used as a reference. | ||
+ | #* The temp stabilization will have to be using the ambient air, as connections to all 16 cells inhibits close contact to cooling plate with liquid control | ||
+ | #* Fernando suggests using a thicker PC board to insulate the SiPM from the electronics hear source. | ||
+ | #* Fernando: remembers that Hamamatsu has provided us a temperature range for SiPM operation. We should dig it out. | ||
+ | # Other | ||
+ | #* Fernando has investigated commercial options for multiplexing signals: a 16/1 multiplexer is available for $4k with each additional multiplexer for $1.6k. The multiplexer can be controlled using many options (GPIB, USB, et). For the moment we will stay with our initial plan of using VME 792 QDCs. | ||
+ | #* Elton asked Jim to think about how to maintain a constant temperature inside the dark box. Possibly heating air slightly above room temperature would be a good option. |
Latest revision as of 07:33, 13 July 2011
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.
- Check the possibility of enlarging the 4-40 screws to hold the cooling plate (Jim)
-
Update the light guide drawings to eliminate the flat section (Chuck)
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: Fernando, Chris, Jim, Chuck, John, Yi, Eugene, Elton, Jack
- Note: due to network disruptions this week, the minutes were not posted to the wiki till 7/13.
- Electrical preamp/sum (Fernando
- Three tested boards ready.
- Chris: need to coordinate with Jack to provide requested cabling
- Need to determine timing response of this system to approve design
- Sasha has contacted Vitali to see if they can use his setup to measure the time response of this circuit.
- Three tested boards ready.
- Mechanical (Jim)
- Screws size for holding fixtures can likely be changed from #4 to #6 screws
- Cooling measurements
- Checking flow of dry nitrogen
- Thermocouples installed at inlet and outlet of cooling plate
- Using 20% propylene glycol mixture, useful to -10 C
- At low flow rates the input temperature is about 17C. Moved flow meter to back side and remeasure
- Eugene: Concern about rapid temperature fluctuations. Need a buffer to smooth out temperature changes
- Discussion regarding options to do this. Will measure time constant for the fluctuations.
- Drawings (Chuck)
- Updated drawings to latest design. They are being checked
- SiPM testing (Yi)
- Writing paper on radiation tests, in final stages
- Will help Sasha with timing tests
- Electronics bias/temp comp (Jack)
- Control circuits are almost ready, not yet connected to scope. May need to get feedback from Yi
- Discussion on temperature stab for production testing
- Decided to make measurements at room temperature, but would like a stable environment
- Need a thermistor at each SiPM to monitor temperature
- First article stabilization time was about 30 min
- Fernando: could use a single SiPM which is measured repeatedly and used as a reference.
- The temp stabilization will have to be using the ambient air, as connections to all 16 cells inhibits close contact to cooling plate with liquid control
- Fernando suggests using a thicker PC board to insulate the SiPM from the electronics hear source.
- Fernando: remembers that Hamamatsu has provided us a temperature range for SiPM operation. We should dig it out.
- Other
- Fernando has investigated commercial options for multiplexing signals: a 16/1 multiplexer is available for $4k with each additional multiplexer for $1.6k. The multiplexer can be controlled using many options (GPIB, USB, et). For the moment we will stay with our initial plan of using VME 792 QDCs.
- Elton asked Jim to think about how to maintain a constant temperature inside the dark box. Possibly heating air slightly above room temperature would be a good option.