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| | # Chamber testing at EEL126 (cell#2) (Beni) | | # Chamber testing at EEL126 (cell#2) (Beni) |
| | #* Results with new gas mixture: [http://www.jlab.org/htbin/PHYSICS/halld/enote112.pl?nb=notebook&action=view&page=573] | | #* Results with new gas mixture: [http://www.jlab.org/htbin/PHYSICS/halld/enote112.pl?nb=notebook&action=view&page=573] |
| − | # Other | + | # Other: [http://www.jlab.org/Hall-D/detector/fdc/movies/FDC_1_1.mov how to assemble a package] |
| − | | + | |
| | <!-- | | <!-- |
| | | | |
| | = Minutes = | | = Minutes = |
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| − | Participants: Bill, Dave, Beni, Simon, and Lubomir. We covered important problems and at the same time we were missing people that could help with the discussions and decisions. | + | Participants: Eugene, Bill, Dave, Beni, Chris, Simon, and Lubomir. |
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| | == Production == | | == Production == |
| | | | |
| − | - Dave: Working now on the second cathode for cell#6. Another two cathodes are needed (type 1 and 2) to finish the cathodes for the first production package. There was a problem with the cutter; the springs will be replaced. The wire plane #5 is ready, yesterday we did the deadening. Right after the deadening a wire sample was made using the same chemical. The stringing stopped because of problems with the HV caps on the next wire frame #6. | + | - Dave: yesterday finished with stringing and taping wire frame #6, today did the position measurements and by the evening the wires will be glued. |
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| − | - Beginning with the wire frame #4, we started testing the HV caps before stringing. It requires some conditioning but few days were enough to test wire frame #5. Now we are having problems with wire frame #6. We identified so far 8 caps that need to be replaced. After the meeting we continued with the tests and we found another 4, so 12 in total. Anatoly, who removed the caps, mentioned that on 5 of these there were solder balls below the caps somewhere between the pads (see pictures linked above). The balls are actually flat (like coins). Therefore we suspect that they were there before the caps were un-soldered by Anatoly. If this is the case then we need to consider new procedures for cleaning/testing/replacing the caps on the boards before the lamination.
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| | == Engineering == | | == Engineering == |
Revision as of 15:26, 25 August 2011
August 25, 2011 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Engineering (Bill)
- Electronics update (Chris)
- Chamber testing at EEL126 (cell#2) (Beni)
- Results with new gas mixture: [6]
- Other: how to assemble a package
![[1]](http://www.jlab.org/Hall-D/detector/fdc/images/P8220381.JPG){kind=link}
![[2]](http://www.jlab.org/Hall-D/detector/fdc/images/P8220383.JPG){kind=link}
![[3]](http://www.jlab.org/Hall-D/detector/fdc/images/P8220385.JPG){kind=link}
![[4]](http://www.jlab.org/Hall-D/detector/fdc/images/P8220373.JPG){kind=link}
![[5]](http://www.jlab.org/Hall-D/detector/fdc/images/P8220375.JPG){kind=link}