Revision as of 17:07, 15 July 2010

July 15, 2010 FDC meeting

Tentative Agenda

Production
- 727 B.C. status
- production planning
- wire stringing design
- rohacell ring production
Electronics: update (Fernando)
Engineering
- Cathode foil: update (Roger)
- Cathode frame prototyping
Full-scale prototype tests
- cosmic test results (Beni) FDC Log Book, pages 505
- oxygen contamination measurements Beni's scheme
Other

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 == Electronics ==
-- Fernando: we expect the first PCBs next week. It turned out that the HV capacitors (rated for 4kV) are not available in the moment
+- Fernando: we expect the first PCBs next week. It turned out that the HV capacitors (rated for 4kV) are not available in the moment, and there's a lead time of 12 weeks if we want to order them. Instead there are 3kV capacitors available. Fernando asked if this is acceptable. Eugene mentioned the problems with the FCAL capacitors and asked if we can wait for the original capacitors that were used already in the prototype. Fernando we will need the capacitors in August to proceed with the stuffing of the PCBs; 3kV and 4kV capacitors are really the same type (different from the FCAL ones) just rated for different HV. We don't expect to put HV more than 3kV for sure. Eugene suggested to do extensive tests of the 3kV capacitors at the working HV.
-- Lubomir looked with the differential probe at the output (with 18m cable) of the new anode and cathode cards. The dynamic range of the anode cards is
+== Engineering ===
-about 2/3 of the range of the cathode cards; according to Fernando this is
-normal and comes from the difference in the gains. This explains the cutoff in
-the fADC spectra discussed before.
+- Roger got
-== Cathode redesign ==
 - Roger is ready with the design, except for a few cosmetic changes. He will send the Gerber files to the company by tomorrow and expects estimations