Difference between revisions of "Minutes-10-25-2012"
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# Third package tests [https://halldweb1.jlab.org/elog-halld/FDC FDC E-log] (Lubomir) | # Third package tests [https://halldweb1.jlab.org/elog-halld/FDC FDC E-log] (Lubomir) | ||
# Other | # Other | ||
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= Minutes = | = Minutes = | ||
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== Cathode corrosion == | == Cathode corrosion == | ||
| − | - | + | - One more sample failed (possibly "Viton only") after 12 days exposure. The first one failed after 4 days (EPDM most likely). Will wait four weeks in total then will lower the temperature. Bill and Eugene are surprised that Apiezon "evaporates" at 100degC. Then in the experiment Viton and Viton+Apiezon samples at this high temperature must be similar, but actually there still might be some residue from the Apiezon, even it's not greasy. In any case such experiment will give you only a lower limit because: 1) Apiezon is different at 100degC 2) humidity is 100%. |
== Engineering == | == Engineering == | ||
| − | - Bill | + | - Bill found a better colling unit (SMC), that compared to the old one (Trillium) has several advantages: it's new (not refurbished like Trillium), SMC monitors the return line as well so can identify leakage, and has RS-454 standard, and more energy efficient. Bill will ask Albert DeChristopher (designated buyer) to order the SMC unit. |
| + | |||
| + | - Cooling in 126 | ||
== Electronics == | == Electronics == | ||
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| + | <!-- | ||
- Chris: PR for the ground clips went through, it will take a month from now to get the clips. PR for the daughter card population not awarded yet, will have all the parts by tomorrow, the turnaround time is a week. | - Chris: PR for the ground clips went through, it will take a month from now to get the clips. PR for the daughter card population not awarded yet, will have all the parts by tomorrow, the turnaround time is a week. | ||
Revision as of 18:50, 25 October 2012
October 25, 2012 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Corrosion tests (Vlad)
- Engineering (Bill)
- Electronics (Chris, Nick)
- Third package tests FDC E-log (Lubomir)
- Other
Minutes
Participants: Eugene, Bill, Dave, Chris, Nick, Vlad, Simon, and Lubomir.
Production
- Dave deadened wire plane #29. Casey and Tina may come this Saturday to string wire plane #30. Will have the gas on Monday, hopefully by the end of the week will start testing the first package. Anatoly is refurbishing the cathodes for package #2. He removed the foil on four cathodes and started the fifth. We decided to stop the refurbishment until we are sure we have the foils. The foils are supposed to be here at the end of November.
- Bill: do we need first article for the foils to check if there are problems. Since this is the same company (Allflex) they now how to do them and what do we need. We didn't have problems with the foils before, Anatoly tested all of them strip by strip. Initially there was some discoloration on the copper and some wrinkles from the wheels of the machine, but they fixed the problems. Lubomir will discuss this with Roger, in case they see some problem to inform us. Eugene: we can use 5um foil, it will work except it will be thicker.
Cathode corrosion
- One more sample failed (possibly "Viton only") after 12 days exposure. The first one failed after 4 days (EPDM most likely). Will wait four weeks in total then will lower the temperature. Bill and Eugene are surprised that Apiezon "evaporates" at 100degC. Then in the experiment Viton and Viton+Apiezon samples at this high temperature must be similar, but actually there still might be some residue from the Apiezon, even it's not greasy. In any case such experiment will give you only a lower limit because: 1) Apiezon is different at 100degC 2) humidity is 100%.
Engineering
- Bill found a better colling unit (SMC), that compared to the old one (Trillium) has several advantages: it's new (not refurbished like Trillium), SMC monitors the return line as well so can identify leakage, and has RS-454 standard, and more energy efficient. Bill will ask Albert DeChristopher (designated buyer) to order the SMC unit.
- Cooling in 126
