Revision as of 16:31, 25 April 2013

April 25, 2013 FDC meeting

Agenda

1. Production Construction Tracking
   • Third package status
   • Spare package
2. Corrosion tests at MePhi: results, [1], [2], [3], [4], [5], [6], [7]
   • Discoloration in the bottom cathode of package #3 [8], [9], [10], [11]
3. Installation (Lubomir, Bill)
   • FDC installation document
   • Practicing at Blue Crab
4. Engineering (Bill)
   • Cooling system tests [12], [13], [14]
5. Electronics (Chris, Nick)
6. Full electronics tests FDC E-log (Beni)
7. Other

Minutes

Participants: Casey, Bill, Chris, Nick, Simon, Beni, Fernando, and Lubomir.

Production

- Third package: Casey installed the manifolds without tightening the compression fittings, but as it turned out from the cooling system tests (see below), we have to check the manifolds with high pressure before finishing the installation.

- Spare package installation: installation table is ready, Casey made the threaded rods that are longer by 6cm for this package. Next week (after we are done with the third package) we will start putting O-rings on two spacer rings and one type-1 cathode. The plan is to install two cells at once. The last two cells will be with the two thicker spacer rings, to be used to test the cluster counting technique. It turned out it that we can use the standard gas (40/60) for these studies instead of the Helium mixture. Due to the lower drift velocity with the standard gas one can get a good cluster separation, just we will have up to ~20 microsec drift time, compared to ~7 microsec with the Helium gas.

Corrosion tests at MePhi

- Vlad sent latest results attached above with pictures. The three Viton samples (one Viton and two Viton+Apiezon) failed at the same time 70 days after the start of the experiment. The two EPDM samples failed within the first 24 hours. Only one Viton sample was still OK, but we decided to open the set-up. Vlad found that the two EPDM samples failed due to the copper corrosion under the O-rings, while all the others had problems in the soldering.

Installation

- We decided with Fernando to have the crates installed in the racks before we start the cabling. The fADC125 modules will be tested separately and then installed in the crates. The cables will be installed in such a way so that they can be connected to each of the three connectors on the module when it becomes available. Thus, when testing a certain package, even if we don't have the modules for that package in place, we can insert other modules there and do the test. The drawback is of course that you test the modules not together with the crate where they are supposed to be used, but this will speed up the FDC installation.

- Cable practicing: Bill will