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| | = Minutes = | | = Minutes = |
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| − | Participants: Eugene, Fernando, Bill, Chris, Nick, Simon, Beni, and Lubomir. | + | Participants: Eugene, Fernando, Dave, Nick, Simon, and Lubomir. |
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| − | == Final installation and testing == | + | == FDC testing status == |
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| − | - FDC was inserted last Thursday. This time we used a cable support attached to the side rails with bearings. After insertion, connecting of the cooling system and turning on the LV we found one LV cable was disconnected in the third package. We borrowed a fancy HD videoscope from SRF and were able to look from the downstream side: probably one wire got caught on something and one side of the LV connector was disconnected. Bill and Dave prepared different tools (pictures attached) and on Monday we tried to insert the connector back but it didn't work. In the meantime we found 7 wire channels disconnected: later it turned out the signal cable was pulled and the connector was partially out. | + | - Final results from the scope test (done by Anatoly) of all the channels with FDC in its final position are in the spreadsheet linked above. About 50 strip channels (0.4% of all the strips) are identified as having some kind of problem, almost all of them related to the conductive tape issue. As compared to the scope tests done after the first "final" insertion almost nothing changed, i.e. the re-insertion didn't create additional problems. |
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| − | - On Tuesday we took the FDC back on the platform. Casey fixed the LV connector; he had to fix also two pins on the daughter card connector that were bent. The wire channels and several cathode channels were also fixed. For 30 min. the TDCs were tested with DAQ and then FDC was inserted back (all done before noon). During the operation we kept the cooling connected and were monitoring the LV currents. | + | - |
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| − | - After the first insertion Anatoly tested all the cathode channels with scope: about 50 bad channels to be compared to 18 before the insertion. After the re-insertion on Tuesday till now, Anatoly has tested half of the crates (we assumed Beni will be able to test the rest with DAQ) and there were no surprises. Anatoly will continue and test all the cathode channels. All of the bad channels (with few possible exceptions) are in the third and fourth package, where we didn't use the vacuum fixture for the cathodes. Eugene suggested to have a special session to discuss the lessons learned from the FDC production and installation.
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| − | - Beni and Cody made significant progress in reading the fADC125. After re-arranging the modules they were able to read half of the crates. Then Cody changed the VME clock from 80MHz to 40MHz and they were able to read the other half of the crates, as well. Still the results coming from the DAQ are with low statistics. They are enough to see that there are no significant problems (like bad connector) but most of the channels have few events and some have zeroes, so one can't count how many are the bad channels. Many of the channels on the most upstream cell (next to the mesh) have noise (up to 20kHz) that results in big output files. Beni will implement individual thresholds for all the channels to suppress the noisy channels.
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| − | - All the wire channels are working fine as tested with the DAQ. From time to time there's noise (up to few kHz) on some channels, again in the first package.
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| | == Engineering == | | == Engineering == |
Revision as of 17:17, 17 April 2014
April 17, 2014 FDC meeting
Agenda
- FDC testing status (Lubomir)
- Final scope results
- Beni's results with DAQ
- Engineering (Bill, Dave)
- Gas system status [1],[2]
- Experimental Safety Assessment Document HallD_ESAD
- Other
- Electronics (Chris, Nick)
- Other
