Difference between revisions of "Sep 13, 2011 SiPM Electrical and Cooling"
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# Action Items | # Action Items | ||
# Schedule, reporting, and manpower (Elton) | # Schedule, reporting, and manpower (Elton) | ||
| + | #* First two production sets of light guides delivered last week | ||
| + | #* USM has shipped another batch of tested SiPMs to JLab | ||
| + | #* Fernando, Chris and Nick have successfully assembled and tested BCAL-01 upstream and downstream modules on the bench | ||
# mini-Bcal (Elton) | # mini-Bcal (Elton) | ||
| + | #* [https://cebaf.jlab.org/elog/entry/1799400 Testing of BCAL-01 readout boards on mini-Bcal] | ||
| + | #* Ringing (viewed on scope) ~ 2mV peak-to-peak relative to 550 mV input LED signal ~ 0.4%. This is compared to old BCAL-00 module of ~ 20 mV/600mV ~ 3.3%, a reduction of x8. | ||
| + | #* Ringing (amplitude) ~ 5.5counts/3012 counts ~ 0.2% | ||
| + | #* Ringing (sum) ~ 19 counts/39780 counts ~ 0.05%, Ringing (sum RMS) ~ 136/39780 ~ 0.3% | ||
| + | #* These numbers are consistent with a 1:400 dynamic range. | ||
| + | #* Still want to digest the information and estimate the number of pixels firing. | ||
# SiPM production testing (Yi) | # SiPM production testing (Yi) | ||
# Mechanical assembly (Jim) | # Mechanical assembly (Jim) | ||
| + | #* All metal parts need to be ordered. There are milled parts and water jet-cut pieces. The drawing set will be checked when Chuck and James return next Monday. They should be finalized and readied for procurement. | ||
# Temperature compensation (Jack) | # Temperature compensation (Jack) | ||
| + | #* Work with Shaun to write up a procedure for substituting a sensor on one of the boards to be assembled. | ||
| + | #* Develop an automatic procedure for producing the jumper sheets. | ||
# Electronic boards (Fernando and Chris) | # Electronic boards (Fernando and Chris) | ||
| + | #* Plan to increase the Cu weight on the board | ||
| + | #* When can we start ordering the production systems? Elton: Would like to digest the test information before making a final decision, but should be soon. We should be ready with orders in case there are available funds. | ||
| + | #* During assembly of the readout modules they found 6 U-boards with defects (out of 80). A total of 2500 have now been tested and only 30 failures found. These will be returned under their warranty. | ||
# Light guide gluing setup (Scot) | # Light guide gluing setup (Scot) | ||
| + | #* Parts have been received for the light guide wand. He will assemble them tomorrow. A washer need to be returned for the correct size. | ||
Revision as of 16:56, 13 September 2012
Action Items from previous meetings
- Decide on cable connections for monitoring cable from Bcal wedge to patch panel. Consider electronics needed for pulsing system (Elton and Fernando)
- Get the dosage from the radiation badges on the mini-Bcal during the beam test (Yi)
-
Investigate source of discrepancy between measured and predicted test voltages on wedge boards (Jack) -
Resort the SiPMs according to input bias groups to make sure the maps correspond to the spread sheets.
Tentative Agenda
- Announcements
- Action Items
- Schedule, reporting, and manpower (Elton)
- mini-Bcal (Elton)
- SiPM production testing (Yi)
- Mechanical assembly (Jim)
- Temperature compensation (Jack)
- Electronic boards (Fernando and Chris)
- Light guide gluing setup (Scot)
Minutes
Attending: Jack, Fernando, Scot, Nick, Jim, Ivan, Yi, Elton.
- Announcements
- Action Items
- Schedule, reporting, and manpower (Elton)
- First two production sets of light guides delivered last week
- USM has shipped another batch of tested SiPMs to JLab
- Fernando, Chris and Nick have successfully assembled and tested BCAL-01 upstream and downstream modules on the bench
- mini-Bcal (Elton)
- Testing of BCAL-01 readout boards on mini-Bcal
- Ringing (viewed on scope) ~ 2mV peak-to-peak relative to 550 mV input LED signal ~ 0.4%. This is compared to old BCAL-00 module of ~ 20 mV/600mV ~ 3.3%, a reduction of x8.
- Ringing (amplitude) ~ 5.5counts/3012 counts ~ 0.2%
- Ringing (sum) ~ 19 counts/39780 counts ~ 0.05%, Ringing (sum RMS) ~ 136/39780 ~ 0.3%
- These numbers are consistent with a 1:400 dynamic range.
- Still want to digest the information and estimate the number of pixels firing.
- SiPM production testing (Yi)
- Mechanical assembly (Jim)
- All metal parts need to be ordered. There are milled parts and water jet-cut pieces. The drawing set will be checked when Chuck and James return next Monday. They should be finalized and readied for procurement.
- Temperature compensation (Jack)
- Work with Shaun to write up a procedure for substituting a sensor on one of the boards to be assembled.
- Develop an automatic procedure for producing the jumper sheets.
- Electronic boards (Fernando and Chris)
- Plan to increase the Cu weight on the board
- When can we start ordering the production systems? Elton: Would like to digest the test information before making a final decision, but should be soon. We should be ready with orders in case there are available funds.
- During assembly of the readout modules they found 6 U-boards with defects (out of 80). A total of 2500 have now been tested and only 30 failures found. These will be returned under their warranty.
- Light guide gluing setup (Scot)
- Parts have been received for the light guide wand. He will assemble them tomorrow. A washer need to be returned for the correct size.
