Difference between revisions of "Minutes-3-14-2013"

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- Dave (not at the meeting) prepared the Production Tracking: all cathodes foe the spare package are ready. We will built also one extra cathode that is tensioned now. Wire planes: Chris is coming tomorrow to Blue Crab to finish with the population of the last two wire planes. Then it will remain four wire planes (one will be extra spare) to be deadened and we are done with the spare parts.       
 
- Dave (not at the meeting) prepared the Production Tracking: all cathodes foe the spare package are ready. We will built also one extra cathode that is tensioned now. Wire planes: Chris is coming tomorrow to Blue Crab to finish with the population of the last two wire planes. Then it will remain four wire planes (one will be extra spare) to be deadened and we are done with the spare parts.       
  
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- On Friday package #1 was moved from 126 to Blue Crab and then package #2 - from Blue Crab to 126. After connecting #1 to Nitrogen it was found cell #5 is leaking; turned out the barb connector for the guage tube was loosely connected. These connectors are glued initially with super glue, but later on some of them (and not on this one) green epoxy was added. Casey was able to glue a new barb connector (not easy to reach the spacer ring  since you have only 5mm between the cathode and the wire frame) and fix the problem. Then green epoxy was added on all the connectors of packages #1 and #4 that didn't have it before (5 out of 12). Bill wants to try with Casey using shoe glue that better sticks to polyethylene.  
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- On Friday package #1 was moved from 126 to Blue Crab and then package #2 - from Blue Crab to 126. After connecting #1 to Nitrogen it was found cell #5 is leaking; turned out the barb connector for the guage tube was loosely connected. These connectors are glued initially with super glue, but later on some of them (and not on this one) green epoxy was added. Casey was able to glue a new barb connector (not easy to reach the spacer ring  since you have only 5mm between the cathode and the wire frame) and fixed the problem. Then green epoxy was added on all the connectors of packages #1 and #4 that didn't have it before (5 out of 12). Bill wants to try with Casey using shoe glue that better sticks to polyethylene.  
  
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- Package #3 repair: on Tuesday hubs were installed on the top side and the package put upside down on the installation table. To access cell #6 we had to remove only the end window and the bottom cathode (type-3). We found 1-2mm hair/lint on a field wire in HV sector 2, exactly where the HV problem was. After removing it we closed the package and started flushing it. It took only 4 people for two hours for this operation, but placing back the ground clips, pre-amps, cooling tube (all had to be removed) and restoring the HV connections will take much longer. The plan is to start testing the package tomorrow.
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== Rebaselining update ==
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- For all of the FDC activities there are links in the above html file, explaining the scope, resources and bases for estimates. Within these links for some of the items there are additional links to documents used for these estimations. There are some items we were not sure about like: 25211210 (materials for cooling), 25211215 (materials for alignment/fiducials), 25211216 (materials for HV connectors). Bill thinks all the materials for the first two have been ordered. As for the HV connectors, we have all the connectors that we need for the FDC (Nick).
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== Installation ==
 
== Installation ==
  
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- Starting with this meeting we will have discussions about the FDC installations. The installation schedule linked above was made with FastTrack using the rebaseline-d schedule. Items not for FDC, but related/needed for the FDC installation (predecessors) are also included.
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- First, it's not clear when we have to move out from Blue Crab. It was decided end of last year that the lease will be extended by one month (till Sep.23), but whether this will be done and how much time facilities need to remove everything from there is not clear. For now we plan to stay there (at least to keep the FDC packages) till Aug. 23. If this is not the case we have to find a good temporary place for the FDC. We were talking also about what will happen with the clean room; everybody says destroying it will be wasting of a lot of money. We also have to find space for all the equipment/tooling so that we will be able to do fixes later if needed. Chris proposed to bring the most valuable tooling to 117.
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- The rails on the platform have to be installed before the FDC appears in the Hall. So far there's no timing issue with that but it's tight. There's maybe a contradiction between BCAL installation and rail mounting that Tim has to address. We depend also on the cable preparations that will be finished just before we start connecting the cables. In any case the schedule as it is, looks fragile
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and we may have to find temporary place for the FDC if there are delays.
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- The timing of the crate installation also contradicts with the timing of the cabling. The crates/modules have to be there, for the cables to be connected, routed and service loops made. Now the crate installation finishes at the same time when the cable installation finishes; we are not sure if and how this will work.
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- The insertion of the FDC is planned for middle of November, and before that (from middle of October) we will be testing the packages extensively. No fixes can be done after the FDC is inserted. Beni listed the main items needed for the tests: trigger from scintillators (possibly  a pair of paddles for each package, or just two that we will move). We need to work with up to 8 crates and Beni thinks this is the limit when using the modules that are in these crates only (ROCs, TIs). Another trigger option will be to have self-triggering from the fADC125s and F1TDCs; Fernando promised to look if this is possible. We expect the gas system to be ready by that time.
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== Engineering ==
 
== Engineering ==

Revision as of 17:43, 14 March 2013

March 14, 2013 FDC meeting

Agenda

  1. Production Construction Tracking (Dave)
    • Spare parts
    • Package #3 repair
  2. Installation schedule (last week), schedule (this week)(Lubomir)
  3. Engineering (Bill)
  4. Electronics (Chris, Nick)
  5. Tests at EEL126 FDC E-log (Beni)
  6. Other


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