Difference between revisions of "Minutes-11-18-2010"

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- Chris received all the populated PCBs. The inspection showed that the packaging was not done correctly (as for the first article) and as a result 8 PCBs (3+3+2 of different types) had broken tips up to 1.5". Bill thinks that this is not crucial and one should be able to glue the PCBs together. The main problem is that the PCBs have much more flux than the first article PCBs; the latter also were not acceptable. Fernando discussed the issue with the company and we will ship all the PCBs back for cleaning. In addition Chris found some other problems that are not crucial (Fernando). Find many pictures from the PCB inspection at  M:\halld-electronics\Documents\FDC\Populated FDC First Articles on Windows, or at the /group/halld-electronics/Documents/FDC/Populated FDC First Articles on linux.   
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- Chris sent the PCBs back to the company for cleaning. Only the first article PCBs (two of each) are here and Chris is cleaning them at 126. They will be ready for gluing and laminating by the beginning of the next week. We have to test all the PCBs with HV applying 2500V, before using them in the production.   
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- Roger received the Gerber files from Allflex adjusted to the production, for final approval. Bill and Fernando looked at them and agreed. The first cathode foils will be produced in the week of 11/29-12/3. The rigid-flex contract was awarded with a company also near Minneapolis. We will have the first article also by the end of the month.
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- Roger: Allflex confirmed they will start the cathode foil production the last week of November. After some iterations with the Gerber files for the rigid-flexes we also expect their production to start at the end of November, so that at the beginning of DEcember we will have  
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- Cathode foil inspection: George Jacob suggested moving the two tables inside the Hall B clean area in the evening before the week of 12/6-12/10, using the roll-up door, so that the particle count goes down by 12/6. We have one 2x5' table and need to find another one. Fernando: need to check the connectivity (resistance if measurable) for each strip, but also between the strips; the latter was an issue before. Fernando will send David the QA procedure for the cathode foils and the PCBs.
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== Engineering ==
 
== Engineering ==

Revision as of 18:46, 18 November 2010

November 18, 2010 FDC meeting

Tentative Agenda

  1. Production (David)
    • Blue Crab status sketch
    • Frame lamination
    • FDC change request discussion [1]
  2. Electronics (Fernando, Chris, Roger)
    • PCB status
    • Other
    • Cathode foil and rigid-flex production
  3. Engineering (Bill, David, Beni)
    • Wire stringing status model.
    • Other
  4. Full-scale prototype tests
  5. Other

Minutes

Participants: Bill, Fernando, Glenn, Eugene, Dave, Al, Chris, Roger, Simon, and Lubomir.

Production

- Blue Crab status: the granite tables and other stuff was moved to make space for the clean room construction. We decided to keep 2 or 3 tables inside the office to be used for gluing the PCB rings and their lamination. Dave found office furniture that we can storage in Blue Crab as long as the accelerator people do not complain.

- All wire frames laminated with Rohacell. Most of them are fly cut and stored in our machine shop; we decided to move them to 126 to make sure they are not exposed to high humidity. Four cathode frames are ready, but Vision Machine had problems with the milling machine and the production will be delayed (this will not affect the production at all). The next step is to glue and laminate the PCBs.

- As requested by Eugene we have updated the FDC production budget linked above; it is needed urgently for the change request. Everybody is encouraged to look at it and make corrections if needed asap.

Electronics

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