Difference between revisions of "Minutes-3-20-2014"

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== Final installation and testing ==
 
== Final installation and testing ==
  
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- FDC was inserted last Thursday. 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.
  
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- There were some discussions initiated by Beni and Fernando, about what will be the consequences if the FDC installation is delayed say by a month. The CDC installation will be delayed, but then the other detectors are not ready for installation. After the meeting Elton discussed this with Tim: we are behind the schedule and more delays will make it even more difficult to do everything that is left in shorter time with the same people.
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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.
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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. Some of the channels have noise that results in big output files. Beni will implement individual thresholds for all the channels to suppress the noisy channels.  
  
 
== Electronics ==
 
== Electronics ==
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- FDC and the mesh have to be grounded before we can discuss the noise problems.
  
 
- A LV cable was cut during installation: the insulation and 3 out of  10 wires were damaged, but there's still LV on the cards.  Chris ordered parts needed to fix it.  
 
- A LV cable was cut during installation: the insulation and 3 out of  10 wires were damaged, but there's still LV on the cards.  Chris ordered parts needed to fix it.  

Revision as of 10:32, 23 March 2014

March 20, 2014 FDC meeting

Agenda

  1. Final installation and testing [1], [2]
    1. Testing with scope (Lubomir)
    2. Testing with DAQ E-log (Beni)
  2. Engineering (Bill, Dave)
    1. Cathode scan [3]
    2. Fixing tools [4]
  3. Electronics (Chris, Nick)
  4. Other


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