Difference between revisions of "Minutes-11-15-2012"
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== Production == | == Production == | ||
| − | - | + | - Tina finished wire soldering of wire plane #30. Tension measurements will be done today. Tomorrow Chris will solder the components. Dave will deaden the wires either on Friday or Monday. So, the plane will be ready for installation in package #4 on Tuesday. |
| − | - Vlad | + | - Vlad finished testing package #1. All channels are working fine. Three pre-amps are oscillating, but the channels are working if using other cards at the same places. Two of the cards have been replaced already with new ones, still the same problem. After ground installation we hope the problem will disappear, if not we can replace the cards later. |
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| + | - Package #1 was disassembled from the mounting table, we still have three metal pins in the package. It was moved to granite table and Vlad just finished the installation of the grounding clips. Next step (probably tomorrow) will be the installation of the cooling tubes. Bill made a tool to place the tube ends in the proper positions and cut them, then install the plastic manifolds. He explained how to fix the tube during this procedure so that they don't apply pressure on the cards/cathodes. | ||
== Cathode corrosion test == | == Cathode corrosion test == | ||
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- The testing chamber was opened. Sample #1 EPDM failed after 12 days, Sample #2 Viton failed after 4 days, Sample #3 Viton+Apiezon didn't fail. After closer look at Sample #2 it turned out that the solder on one side of the trace corroded, or was somehow damaged during soldering and later at this high temperature and humidity failed. In gas EPDM failed after 8/10 days (we had two samples). So maybe it is only the EPDM itself responsible for the corrosion. The good news: no corrosion observed yet when using Viton. Also, the fail of sample #2 indicates problems when soldering on the thin copper; good we didn't do it! | - The testing chamber was opened. Sample #1 EPDM failed after 12 days, Sample #2 Viton failed after 4 days, Sample #3 Viton+Apiezon didn't fail. After closer look at Sample #2 it turned out that the solder on one side of the trace corroded, or was somehow damaged during soldering and later at this high temperature and humidity failed. In gas EPDM failed after 8/10 days (we had two samples). So maybe it is only the EPDM itself responsible for the corrosion. The good news: no corrosion observed yet when using Viton. Also, the fail of sample #2 indicates problems when soldering on the thin copper; good we didn't do it! | ||
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- Moving to Blue Crab: according to Ron Bartek (Bill) fixing the temperature in 126 using ceiling fans will cost $19k. Installing the power at Blue Crab for the testing set-up will cost $7k, but including the power for the chiller that we will have to do in 126, as well. | - Moving to Blue Crab: according to Ron Bartek (Bill) fixing the temperature in 126 using ceiling fans will cost $19k. Installing the power at Blue Crab for the testing set-up will cost $7k, but including the power for the chiller that we will have to do in 126, as well. | ||
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| + | == Other == | ||
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| + | - No FDC meetings next two weeks: on Thanksgiving and the week after that. Will meet again on December 6. | ||
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Revision as of 18:00, 15 November 2012
November 15, 2012 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- First package testing (Vlad)
- Plans for finishing/testing packages #1 and #4
- Corrosion tests (Vlad)
- Engineering (Bill)
- Electronics (Chris, Nick)
- Third package tests: wire resolution FDC E-log (Lubomir)
- Moving to Blue Crab?
- Other
