Difference between revisions of "Minutes-11-8-2012"
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== Cathode corrosion test == | == Cathode corrosion test == | ||
| − | - The testing chamber was opened. | + | - 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 it 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! |
== Engineering == | == Engineering == | ||
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| − | - Bill has ordered | + | - Bill has ordered the new SMC chiller; the fluorinert would cost $1.7k. Working on the documentation for the pressure system. |
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== Electronics == | == Electronics == | ||
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- Beni has now a software to convert the evio data files to hddm including fADC information. We had special runs with cathode information (both up/down) from three cells. Simon will look into this. At the same time Simon looked into the runs with wire information only and found an estimate for the resolution (at the minimum, as function of the distance to the wire) of ~200 microns. Eugene: since Simon included all the wires in the fit and we have two degrees of freedom, the resolution must be factor of sqrt(2) bigger, maybe consistent with Beni's result when using parallel wires. | - Beni has now a software to convert the evio data files to hddm including fADC information. We had special runs with cathode information (both up/down) from three cells. Simon will look into this. At the same time Simon looked into the runs with wire information only and found an estimate for the resolution (at the minimum, as function of the distance to the wire) of ~200 microns. Eugene: since Simon included all the wires in the fit and we have two degrees of freedom, the resolution must be factor of sqrt(2) bigger, maybe consistent with Beni's result when using parallel wires. | ||
| − | - | + | - Bill: according to Ron Bartek 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. |
| − | - | + | - External chamber information was included in the hddm file, but Simon doesn't see correlations with the FDC data, except roughly the expected position. |
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Revision as of 19:35, 8 November 2012
November 8, 2012 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- First package testing (Vlad)
- Corrosion tests, corroded solder on Viton sample (Vlad)
- Engineering (Bill)
- Bubbler issue and pressure control [1]
- Electronics (Chris, Nick)
- Third package tests FDC E-log (Beni, Simon)
- Moving to Blue Crab?
- Other
Minutes
Participants: Bill, Dave, Chris, Nick, Vlad, Simon, Beni, and Lubomir.
Production
- Casey and Tina strung wire frame #30 on Saturday. Dave put the Kapton dots and did position measurements. Casey will come again this Saturday to glue the wires. Anatoly is preparing the old cathode frames for package #2 and will finish soon.
- Vlad is testing package #1. Currents on cell #4 300nA, #3 350nA, #2 170nA, #1 (just started) 500nA. For comparison 3 weeks ago we had 900nA on cell #4. All the channels so far are working fine. Vlad found two pre-amps oscillating.
Cathode corrosion test
- 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 it 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!
