Difference between revisions of "Minutes-4-21-2011"
From GlueXWiki
| Line 20: | Line 20: | ||
== 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. Eugene explained the finding done with electron microscope by Olga: chlorine was found, so most likely this is copper chloride (brown) and copper chloride | + | - 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 with Allflex). Then the effects we see is due to the wetting of the foils needed for the alignment and gluing the panels together. So far we exclude the possibility that the copper reacts with the granite or the packing paper. |
| − | - the first production cathode was glued tensioned and the frame was glued to it; cutting the flaps and the holes is next. Some | + | - 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. |
- a PCB ring was glued to be used for the first production wire frame. Tests with light show the surface at the seams is not perfectly flat. Anatoly will work on this. Next steps: trimming the Rohacell OD on the wire frame and laminating the PCB ring. We will accelerate this so that we can work on the wire frame in parallel with the cathodes. Bill asked if it will be acceptable to use parafin to cover some parts of the Rohacell OD that is needed for the ultrasonic cleaning. Lubomir will investigate this. | - a PCB ring was glued to be used for the first production wire frame. Tests with light show the surface at the seams is not perfectly flat. Anatoly will work on this. Next steps: trimming the Rohacell OD on the wire frame and laminating the PCB ring. We will accelerate this so that we can work on the wire frame in parallel with the cathodes. Bill asked if it will be acceptable to use parafin to cover some parts of the Rohacell OD that is needed for the ultrasonic cleaning. Lubomir will investigate this. | ||
Revision as of 14:41, 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
