Revision as of 11:56, 15 November 2013

November 14, 2013 FDC meeting

Agenda

1. Installation status[1]
2. Engineering (Bill)
   • FDC survey
   • Cooling system
3. Electronics (Chris, Nick)
4. Mini-DAQ for FDC tests [2] (Beni)
5. Full electronics test analyses (Lubomir)
6. Other

Minutes

Participants: Eugene, Bill, Dave, Nick, Chris, Simon, Vlad, Beni, and Lubomir.

Installation

- FDC was moved to the floor on Monday. Bill, Casey, and Dave glued the 16 reflectors to the gussets of the packages (four per package). The survey group started working on the new targets yesterday and they are working now. Preliminary findings: if looking along z they found distance between the first and last package to the be the same as the measured one within 0.5mm (measured with measuring tape?). However, they found that this is no longer the case if you look at some angle (w.r.t. the normal of the reflectors), as Eugene expected. They are now trying to find what is the angle range that is acceptable. They were also instructed to redo all the surveys they did before: the four SMR holders on each package and the flatness measurements.

Engineering

- We discussed again the previous survey results. As stated at the last meeting, Bill found that the nominal thickness of the first package is very close to the measured value from the flatness data. However, when he looked at the other packages he found that 4 is OK, but 2 and 3 are not: ~0.5mm discrepancy. In addition there's a discrepancy for the position of the 4th package as measured with the four SMR holders between the Blue Crab and the first survey in the Hall. That's why they will redo all the measurements now.

- Bill: we have all the parts to connect the cooling system. Bill will check if the chilled water is ready, and what else remains to be done. We discussed if want to do the cooling system checks down on the floor, or up on the platform. Most of the people preferred to do this on the platform (the disadvantage: more difficult to check the manifolds, tubing at the bottom). Tom had an idea to have a long tube that connects the FDC on the platform to the chiller through the magnet which will be the final connection, but Bill prefers to place the chiller at the upstream side with a short tube to the FDC as a temporary connection.

Electronics

- Nick: all the cables have been nicely stored and organized in the cave behind the platform. The LV system is now connected. The two crates (fADC125 and F1TDC) that will be used for testing were mounted on the rack. The main issue now is the power for the crates. It turned out there's no 208V two phases on the transformer, that is the required power for the crates. In principle we can use 110V (but powering only some of the modules!), but it turned out there's only 15A and the crate requires 20A. Tom is looking now for a solution.

Mini-DAQ

- Beni