Difference between revisions of "Minutes-10-28-2010"
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== Production == | == Production == | ||
| − | - The humidity was very high yesterday (above 80%) at Blue Crab and the Rohacell material that was not laminated was deformed. We still have to check if the four laminated wire frames that are at Blue Crab are OK. | + | - The humidity was very high yesterday (above 80%) at Blue Crab and the Rohacell material that was not laminated was deformed. We still have to check if the four laminated wire frames that are at Blue Crab are OK. Bill: we can't stop the production and should continue with the lamination. |
| + | Slution: to put a dehumidifier at one of the offices at Blue Crab and to use it for the Rohacell lamination. To recover the original Rohacell shape ones needs to heat it at 250degF, but don't have to do it because we have enough material (Casey). | ||
| − | - | + | - We will try to do both the Rohacell ring gluing and the lamination to the wire frame at once with vacuum bagging. Bill is thinking about a box for storage flushed with nitrogen. 14 wire frames (almost half) are laminated. |
| − | + | == Electronics == | |
| − | - | + | - Chris was investigating different ways of cleaning the PCBs using Vigor flux-off. We discussed if we can buy an ultrasonic cleaner 42"x18"x6" that will be used also to clean the wire frames after soldering the wires for $5500. Glenn agreed. |
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| + | - Fernando: the first article signal cables will arrive by mid November and Chris is working on a board to be used for testing. The solder material (japanese ) recommended from UVA is ano longer available. Chris ordered similar materialial from | ||
- Chris: Inspecting the first article (8, two of each) populated PCBs. Initially they could hold a maximum voltage of ~1500V.The problem: flux from the soldering under the capacitors. Chris cleaned 5 channels (using some flux-off spray) and they could hold 2500V without problems. Fernando decided to go ahead with the full production by requiring the company to improve the cleaning procedures. | - Chris: Inspecting the first article (8, two of each) populated PCBs. Initially they could hold a maximum voltage of ~1500V.The problem: flux from the soldering under the capacitors. Chris cleaned 5 channels (using some flux-off spray) and they could hold 2500V without problems. Fernando decided to go ahead with the full production by requiring the company to improve the cleaning procedures. | ||
Revision as of 18:35, 28 October 2010
October 21, 2010 FDC meeting
Tentative Agenda
- Production (David)
- Blue Crab status [ttp://www.jlab.org/Hall-D/detector/fdc/production/BCplan.pdf sketch]
- Frame lamination FDC Log Book, page 533
- Electronics (Fernando, Chris, Roger)
- Update on PCBs
- Cathode foil and rigid-flex procurement
- fADC125/F1TDC synchronization (Beni, Gerard) FDC Log Book, page 531
- Engineering (Bill, David)
- Wire stringing
- Cathode foils: plans for inspection, storage, and cathode lamination
- Full-scale prototype tests (Lubomir)
- gas gain measurements FDC Log Book, page 530
- other studies with fADC FDC Log Book, page 532
- Other
