Difference between revisions of "Minutes-8-23-2012"
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- The third package is ready with the subsystems: grounding, cooling tubes, HV cabling. The plan is to move it to 126 tomorrow. The grounding worked fine, Vlad put ~100 clips for grounding as planned and another ~100 attached close to both sides of the cards (where possible and needed) to prevent the cathode deformation at the periphery. As Casey suggested, we used a new method to install the cooling tubes. We tightened the bracket on one card in the middle of the tube and installed the rest of the brackets loose. Then, going from the middle card toward the two ends of the tube we tightened the rest of the brackets. Thus, the copper tubes apply some pressure on the cards; before we had problems with some of the cards being pulled by the tubes. Gluing of the back brackets with green epoxy to the tubes was done at the end. In 126 after installing the cables we should experiment how easy will be to remove the extra clips we put on the card sides. | - The third package is ready with the subsystems: grounding, cooling tubes, HV cabling. The plan is to move it to 126 tomorrow. The grounding worked fine, Vlad put ~100 clips for grounding as planned and another ~100 attached close to both sides of the cards (where possible and needed) to prevent the cathode deformation at the periphery. As Casey suggested, we used a new method to install the cooling tubes. We tightened the bracket on one card in the middle of the tube and installed the rest of the brackets loose. Then, going from the middle card toward the two ends of the tube we tightened the rest of the brackets. Thus, the copper tubes apply some pressure on the cards; before we had problems with some of the cards being pulled by the tubes. Gluing of the back brackets with green epoxy to the tubes was done at the end. In 126 after installing the cables we should experiment how easy will be to remove the extra clips we put on the card sides. | ||
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== Cathode corrosion == | == Cathode corrosion == | ||
| − | - | + | - New SEM results from Olga (follow the above link) for the samples from the Vlad's test with the vacuum chamber; the chamber had water inside and temperature at end of the day (lamps were off overnight) was close to 100degC. The test was done for about 4 days. |
| + | --Copper foil with EPDM inside: significant corrosion, a lot of sulfur present. | ||
| + | --With the EPDM of the gasket part of the foil strips were inside the gas chamber and part exposed to the air: no sulfur seen at the air side and a lot of it at the gas side. However, inside the gas volume there was moisture and the temperature was much higher than outside. We had seen corrosion before also in the samples placed in air with some water put on the foils and no heating. | ||
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- Results from the vacuum chamber (Vlad's) experiment: it was running from last Thursday (end of the day) till Monday morning, pictures linked above. One clearly sees damages on the EPDM sample, just a little on the Viton one and no damages are seen on the Viton+grease sample. The samples are now with Olga and will have SEM results next week. Bill proposed to make another sample with Viton+grease with curving shape to have more potentially damaged area and then measure if the resistance has changed. Vlad will check the resistance of the samples that we have now. On Tuesday we started the same test except there's no water inside the gas volume. | - Results from the vacuum chamber (Vlad's) experiment: it was running from last Thursday (end of the day) till Monday morning, pictures linked above. One clearly sees damages on the EPDM sample, just a little on the Viton one and no damages are seen on the Viton+grease sample. The samples are now with Olga and will have SEM results next week. Bill proposed to make another sample with Viton+grease with curving shape to have more potentially damaged area and then measure if the resistance has changed. Vlad will check the resistance of the samples that we have now. On Tuesday we started the same test except there's no water inside the gas volume. | ||
Revision as of 17:56, 23 August 2012
August 23, 2012 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Cathodes
- Third package
- Cathode corrosion
- Results from SEM analyses: [1]
- Test chambers
- Engineering (Dave)
- Cathode strong-backs
- Electronics (Chris, Nick)
- PCBs
- TDR, pages 132-145 (Lubomir)
- Other
Minutes
Participants: Fernando, Tim, Eugene, Dave, Simon, Vlad, and Lubomir
Production
- Dave: working on 10 new cathodes to be used in the first package, not in the second package as we always stated before. Again the bottleneck is the card gluing, but we will start making progress there, by tomorrow we plan to have the cathode strong-backs ready to be used to move the cathodes. Will start working soon on the other two cathodes that are needed to finish the first package. After that we will have two sets of cathode foils left.
- The third package is ready with the subsystems: grounding, cooling tubes, HV cabling. The plan is to move it to 126 tomorrow. The grounding worked fine, Vlad put ~100 clips for grounding as planned and another ~100 attached close to both sides of the cards (where possible and needed) to prevent the cathode deformation at the periphery. As Casey suggested, we used a new method to install the cooling tubes. We tightened the bracket on one card in the middle of the tube and installed the rest of the brackets loose. Then, going from the middle card toward the two ends of the tube we tightened the rest of the brackets. Thus, the copper tubes apply some pressure on the cards; before we had problems with some of the cards being pulled by the tubes. Gluing of the back brackets with green epoxy to the tubes was done at the end. In 126 after installing the cables we should experiment how easy will be to remove the extra clips we put on the card sides.
Cathode corrosion
- New SEM results from Olga (follow the above link) for the samples from the Vlad's test with the vacuum chamber; the chamber had water inside and temperature at end of the day (lamps were off overnight) was close to 100degC. The test was done for about 4 days. --Copper foil with EPDM inside: significant corrosion, a lot of sulfur present. --With the EPDM of the gasket part of the foil strips were inside the gas chamber and part exposed to the air: no sulfur seen at the air side and a lot of it at the gas side. However, inside the gas volume there was moisture and the temperature was much higher than outside. We had seen corrosion before also in the samples placed in air with some water put on the foils and no heating.
