Difference between revisions of "Minutes-3-21-2013"

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- Dave: the last two wire frames populated. The only remaining operation is to deaden four wire planes. The extra spare cathode type-2 is tensioned, but the cards are not installed yet by purpose (for easy storage).
 
- Dave: the last two wire frames populated. The only remaining operation is to deaden four wire planes. The extra spare cathode type-2 is tensioned, but the cards are not installed yet by purpose (for easy storage).
  
- Package #3 repair: last Friday we started testing the top cell (after we opened it once and removed a lint) and it was tripping again. On Monday we opened the package for a second time and looked more carefully: there were some small balls on two sense wires and section of a field wire that looked suspicious. We tried to clean these places and closed the package, turned out again without success. Troubleshooting the problem is difficult because it appears from time to time once per several hours. The dark currents are very low, there's no constant noise  and we can't localize the problem. We decided to open the package tomorrow morning, put the wire frame on the stringing table at 90deg (Bill's idea) and scan the wires with the camera. We will clean if possible, or replace the bad wires and next week will give it another try. If it still doesn't work, we will put a new wire frame (#
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- Package #3 repair: last Friday we started testing the top cell (after we opened it once and removed a lint) and it was tripping again. On Monday we opened the package for a second time and looked more carefully: there were some small balls on two sense wires and section of a field wire that looked suspicious. We tried to clean these places and closed the package, turned out again without success. Troubleshooting the problem is difficult because it appears from time to time once per several hours. The dark currents are very low, there's no constant noise  and we can't localize the problem. We decided to open the package tomorrow morning, put the wire frame on the stringing table at 90deg (Bill's idea) and scan the wires with the camera. We will clean if possible, or replace the bad wires and next week will give it another try. If it still doesn't work, we will put a spare wire frame (#28, it had higher dark (~350nA) current but was stable for weeks).
  
 
== Installation ==
 
== Installation ==
  
- This week there were significant changes in the re-baselined schedule. The last- and this-week-schedule related to the FDC installation are linked above. Almost all of the FDC installation activities are delayed by 1-2 months, so the insertion into the magnet happens in the beginning of January 2014. From Eugene we know the big change is a result of a manpower spike that had to be smooth out. Beni: if this is the case probably additional manpower from the universities could help. However, Beni learned from Fernando the real reason is the the timing of the receiving of the fADC125 and F1TDC, and their testing/installation in the crates and racks and here students could not help. Expect more discussions in the coming meetings.
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- The last, "frozen" schedule changed just by a couple of days. Now the FDC insertion is in the middle of January 2014, dictated mainly by the electronics. Since the testing outside of the magnet should start much earlier we must be able to test the different packages connecting to the same electronics.  
  
- In this case the chance that we will have to leave Blue Crab but the infrastructure in the Hall will not be ready for the FDC installation, is very big. According to Rusty Sprouse the plan for Blue Crab is to extend  the lease by one month (till the end of September), but has not been done yet. In the best base we will have to leave end of August, but the installation will start in October according to the new schedule, so we need to find a storage space. ESB has climate control but is very dirty. Bill: what about space in TDEF? Beni: can we move the clean room (or part of it) from Blue Crab to the ESB?
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- With Eugene, Bill, and Fernando together there were long discussions about the cabling. There was a concern (Lubomir) that with the current installation scheme, when the FDC is inserted one needs extra cable that is one cart long. In total we will need about 3 x 2.5 carts which might be close to 18m, the length of the signal cables. Bill will check that with the I-deas model. Fernando insisted that that we have to keep the cables fixed to the racks at the downstream end and never un-bundle them. In this case the question is where to put the extra bundles that are 6-7m long after the insertion of the FDC: if possible somewhere at the front of the magnet??    
 
   
 
   
 
== Engineering ==
 
== Engineering ==

Revision as of 16:31, 21 March 2013

March 21, 2013 FDC meeting

Agenda

  1. Production Construction Tracking (Dave)
    • Package #3 repair
  2. Installation schedule(Lubomir)
  3. Engineering (Bill)
    • Cooling manifold installation and tests
  4. Electronics (Chris, Nick)
  5. Tests at EEL126 FDC E-log (Beni)
  6. Other