Difference between revisions of "Minutes-4-21-2011"
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== Production == | == Production == | ||
| − | - we found discoloration spots on the first cathodes that were produced at Blue Crab. The spots are brown but have blue color at the periphery. There's one spot covering several thin traces close to a connector. Eugene explained the finding done with electron microscope by Olga: chlorine was found, so most likely this is copper chloride (brown) and copper chloride dihydrate (blue). We suspect chlorine is left from the etching procedure (have to verify that | + | - we found discoloration spots on the first cathodes that were produced at Blue Crab. The spots are brown but have blue color at the periphery. There's one spot covering several thin traces close to a connector. Eugene explained the finding done with electron microscope by Olga: chlorine was found, so most likely this is copper chloride (brown) and copper chloride dihydrate (blue). We suspect chlorine is left from the etching procedure (have to verify that Allflex uses ferric chloride for etching). Then the effects we see is due to the wetting of the foils, this is needed for the alignment and gluing the panels together. So far we exclude the possibility that the copper reacts with the new packing paper. This is due the fact that we see more spots on the first article foils than on the production foils. Still, we are waiting to hear from Andy Wu who will do independent analyses. Eugene, Lubomir and others agreed that Allflex should continue with the foil production. |
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- the first production cathode was glued tensioned and the frame was glued to it; cutting the flaps and the holes is next. Some ofhese procedures still require signatures. Cutting the second production cathode started with problems with the cutter. Bill thinks it is the granite surface that damages the blades. Using harder blade and treating the granite surface must help. Bill also made modifications to the cutter to prevent wobbling of the blade. | - the first production cathode was glued tensioned and the frame was glued to it; cutting the flaps and the holes is next. Some ofhese procedures still require signatures. Cutting the second production cathode started with problems with the cutter. Bill thinks it is the granite surface that damages the blades. Using harder blade and treating the granite surface must help. Bill also made modifications to the cutter to prevent wobbling of the blade. | ||
Revision as of 15:40, 21 April 2011
April 21, 2011 FDC meeting
Agenda
- Production (Dave)
- Cathode production, copper discoloration
- Wire plane production
- Other issues
- Electronics status (Fernando,Chris)
- Engineering status (Bill)
- Chamber testing (Lubomir)
- Other
