Difference between revisions of "Dec 10, 2010 SiPM Electrical and Cooling"
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== Minutes == | == Minutes == | ||
| − | ''Attendees: | + | ''Attendees: Elton, Yi, Carl, Jim, Chuck, Jack, Fernando |
# Review schedule and list of "deliverables" | # Review schedule and list of "deliverables" | ||
| Line 22: | Line 22: | ||
#* cooling plate | #* cooling plate | ||
#* preamp/summing board | #* preamp/summing board | ||
| + | #* ADDED: Electronic heat removal (possibly heat plate) | ||
#* temp feedback/ bias board | #* temp feedback/ bias board | ||
#* light covers | #* light covers | ||
| Line 28: | Line 29: | ||
#* mechanical support | #* mechanical support | ||
# First article testing (Carl) | # First article testing (Carl) | ||
| + | #* Reviewed list of tests to be conducted for first article | ||
| + | #* Estimated time is 1.5 to 2 hours per unit (i.e. 120 - 160 hours of testing for 80 units). Note that nominal schedule has 1 month for accepting first article. | ||
| + | #* Yi: Automation using labview interfaces may help speed up testing. | ||
| + | #* Will continue discussion at meeting next week | ||
# Mechanical cooling (Jim) | # Mechanical cooling (Jim) | ||
| + | ##Issue with current plate and 4 mm tubing requires 80 psi with 4% pressure drop to equilize temperature. | ||
| + | ## New concept with 3/8" od tubing uses 10 psi (nominal chiller output) with 0.1 psi pressure drop. | ||
| + | ##* New concept replaces SiPM mounting plate with PC board and SiPM pin connection via traces to a connector that mates with pre-amp/summing board. | ||
| + | ##* Fernando: Several issues with this new idea: | ||
| + | ##** Primarcy concern: increased inductance of leads due to routing through board connector | ||
| + | ##** SiPMs are soldered onto PC board, which makes replacing arrays difficult | ||
| + | ##** Can do some tests to check impact of these changes on performance, but they are likely to be large | ||
# Temperature compensation (Jack) | # Temperature compensation (Jack) | ||
| + | #* Difficulty with design for continuous operation between 5 and 25 deg. Likely two settings will be required, one at 5 deg and one at 20 deg. | ||
| + | #* Carl: DeltaG/DeltaT is constant with temperature, so gradients are expected to be the same for the two settings. | ||
| + | #* Discussion of various design options. Current ideas lead to about 65 mW/channel or about 1 mA/ device at 70 V. Precision resistor consumes 45 mW. Off the self items are equivalent to 100 KOhms for $2/resistor. At 1 MOhm sell for $20/channel, reducing power consunmption. | ||
| + | #* Fernando to share previous design ideas with Jack for reference | ||
# Preamp-summing (Fernando) | # Preamp-summing (Fernando) | ||
# Discussion | # Discussion | ||
Revision as of 17:22, 10 December 2010
Background information
Tentative Agenda
- Review schedule and list of "deliverables"
- First article testing (Carl)
- Mechanical cooling (Jim)
- Temperature compensation (Jack)
- Preamp-summing (Fernando)
- Discussion
Minutes
Attendees: Elton, Yi, Carl, Jim, Chuck, Jack, Fernando
- Review schedule and list of "deliverables"
- Enclose 3D model
- Light guide grating
- SiPM mount
- cooling plate
- preamp/summing board
- ADDED: Electronic heat removal (possibly heat plate)
- temp feedback/ bias board
- light covers
- cable supports/layout
- cooling tubes support/layout
- mechanical support
- First article testing (Carl)
- Reviewed list of tests to be conducted for first article
- Estimated time is 1.5 to 2 hours per unit (i.e. 120 - 160 hours of testing for 80 units). Note that nominal schedule has 1 month for accepting first article.
- Yi: Automation using labview interfaces may help speed up testing.
- Will continue discussion at meeting next week
- Mechanical cooling (Jim)
- Issue with current plate and 4 mm tubing requires 80 psi with 4% pressure drop to equilize temperature.
- New concept with 3/8" od tubing uses 10 psi (nominal chiller output) with 0.1 psi pressure drop.
- New concept replaces SiPM mounting plate with PC board and SiPM pin connection via traces to a connector that mates with pre-amp/summing board.
- Fernando: Several issues with this new idea:
- Primarcy concern: increased inductance of leads due to routing through board connector
- SiPMs are soldered onto PC board, which makes replacing arrays difficult
- Can do some tests to check impact of these changes on performance, but they are likely to be large
- Temperature compensation (Jack)
- Difficulty with design for continuous operation between 5 and 25 deg. Likely two settings will be required, one at 5 deg and one at 20 deg.
- Carl: DeltaG/DeltaT is constant with temperature, so gradients are expected to be the same for the two settings.
- Discussion of various design options. Current ideas lead to about 65 mW/channel or about 1 mA/ device at 70 V. Precision resistor consumes 45 mW. Off the self items are equivalent to 100 KOhms for $2/resistor. At 1 MOhm sell for $20/channel, reducing power consunmption.
- Fernando to share previous design ideas with Jack for reference
- Preamp-summing (Fernando)
- Discussion
