Minutes-7-18-2013

July 18, 2013 FDC meeting

Agenda

1. Production
   • Final package assembly [1], [2], [3] (Bill, Dave)
2. Engineering (Bill)
   • Survey
   • Connector strain relief [4], [5],[6]
3. Electronics (Chris, Nick)
4. Full electronics test FDC E-log (Lubomir, Vlad)
5. Other

Minutes

Participants: Bill, Chris, Nick, Simon, Fernando, Vlad, Eugene, Glenn, and Lubomir.

Production

- On Monday we finished the tests with the third package and it was moved to Blue Crab. On the same day the spare package was moved to JLab.

- Final package installation (see the pictures linked above): All the four packages were connected with the spacers. Like between with the first spacer we had to put additional rod in the second spacer to clear the gap between the spacer and the gusset ring. The last (shorter) spacer didn't need additional threaded rod, at least visually.

Engineering

- Survey: Jim Dahlberg was at Blue Crab yesterday and will start surveying the packages possibly tomorrow using 12ft articulated arm. The idea is to check (and correct) the flatness of each package and how parallel they are.

- Based on our experience with the test with full electronics we need good strain relief for the connectors. Therefore, Bill decided to make additional skim above the spacers to be used to attach the cables (see the model details linked above). It will use 15mil g10 (or lighter material) and be supported by ~22 or less plastic (or g10) holders attached to the rods. There will be cuts on the skin to insert cable ties. Bill will start prototyping it very soon.

Electronics

- There were long discussions about the grounding of the packages. The scheme will be that we will have one ground cables clamped to all the packages at the holding brackets and possibly a separate removable ground cable connecting the packages to the clean ground. There will be some additional ground connections to other parts inside the package, but using thinner cables. Fernando will stop at Blue Crab to make sure that grounding is done correctly and what modifications are needed eventually.

- Nick and Chris will fix the setting on the VXS power supply in 126. Fernando: this will further reduce the noise on the fADCs as it happened with the fADC250s (2.4kHz effect).

- Nick on the spare pre-amps: 14 pre-amps cathode type and 8 pre-amps anode type.

Other

- No meeting next week.