Difference between revisions of "Minutes-7-11-2013"

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== Full electronics tests ==
 
== Full electronics tests ==
  
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- Beni and Vlad did a lot of work recently on the electronics and the detector to make almost all of the channels working now.  
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- Beni explained his latest results (FDC Elog 115): after fixing the trigger cable to the first crate (fADCs cells 1 and 2) and changing the algorithm for applying thresholds, now the strip efficiencies are ~98% (note also we are at 2200V). Strip problems: one bad connector/daughter card/conductive tape in the middle of cell 5 with about 10 channels not working, several channels with problems outside of the detector, some of them in the fADC, and also few channels showing problems from time to time. Wires: one translator board not working (half of a cell), identified by swapping the cables. Beni discussed also the slopes of the wires as reconstructed by the strips. On some of the planes there are systematical deviations up to 1mm over 1m (Bill: difficult to attribute this to some mechanical problems), but one can correct for these deviations offline.
  
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== Other ==
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- Vlad also did a lot of work fixing the strip channels: some were fixed just by touching the cards, some by re-seating the cards, and some by using canned air and contact cleaner. It is not clear where exactly the problems were; it could be that by using canned air and cleaner, we just cool the connector and due to the thermal conductivity also the conductive tape.
  
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- No meeting next week: 4th of July.
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- We discussed different options what to the with the bad place in cell 5: open the package and fix the connector (Eugene didn't support this option), try to fix it without opening by inserting thin plate in between the conductive tape and the wire frame which is against the cathode frame, or do nothing (very small percentage of all the channels). After the meeting Lubomir and Bill inserted a thin g10 plate 2" wide to cover the whole conductive tape and we immediately saw an improvement, only 2 problematic channels. On the next day, by playing carefully with the plate we fixed all the channels of this card. Casey cut the plate so that it doesn't stick out of the cathode and we will leave it there permanently. Thus, the plan will be to take data at three different HVs over the weekend and move the third package back to Blue Crab.
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== Thick cell results ==
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Revision as of 17:03, 12 July 2013

July 11, 2013 FDC meeting

Agenda

  1. Production
  2. Engineering (Bill)
  3. Electronics (Chris, Nick)
  4. Full electronics test FDC E-log (Beni)
    • Pre-amp contact issues (Vlad)
  5. Thick cell results [8],[9],[10], [11](Lubomir, Vlad)
  6. Other


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