Difference between revisions of "Minutes-6-28-2012"

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Left and right sides are symmetric. Two bundles run on the floor turn below the platform and go up through openings to the racks. The other two bundles will run over hangers attached to the racks and installation cards.  
 
Left and right sides are symmetric. Two bundles run on the floor turn below the platform and go up through openings to the racks. The other two bundles will run over hangers attached to the racks and installation cards.  
  
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- The lenght of the bundles in the drawing is biggest for the initial position. While the FDC is moved into the magnet, the top sections of the carts will be removed and the lower bundles will be lifted (there's enough slack) over the lower part of the carts. According to Tom this will be the most difficult part: the bundles have to be well supported to avoid deformation of the mesh cylinder. During this operation the bent position of the bundles will cahnge all the time. Despite  
+
- The lenght of the bundles in the drawing is biggest for the initial position. While the FDC is being moved into the magnet, the top sections of the carts will be removed and the lower bundles will be lifted (there's enough slack) over the lower part of the carts. According to Tom this will be the most difficult part: the bundles have to be well supported to avoid deformation of the mesh cylinder. During this operation the bent position of the bundles will cahnge all the time. Despite  
 
the sitffness of the bundle this will be possible (Tim, Tom). In the final position the lenght of the bundled section will be smallest, in reality the bundle length will not change, which means we have to find place for service loops. There will be additional loops of the individual cables eigher inside the bundles or close to the elctronics.
 
the sitffness of the bundle this will be possible (Tim, Tom). In the final position the lenght of the bundled section will be smallest, in reality the bundle length will not change, which means we have to find place for service loops. There will be additional loops of the individual cables eigher inside the bundles or close to the elctronics.
  
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- Dave showed the scheme (linked above) for the package refurbishment. As we did with the third and fourth packages we will install and test them in two halves. Techs working on the last two spare cathodes and preparing the last two spare wire frames for testing.  
 
- Dave showed the scheme (linked above) for the package refurbishment. As we did with the third and fourth packages we will install and test them in two halves. Techs working on the last two spare cathodes and preparing the last two spare wire frames for testing.  
  
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- Chris will order  
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- Chris will submit PR for four PCB sets. We need to build (so far) one wire frame and for that we have a spare laminated G10 frame. If more frames are needed we will have to order more G10 frames, as well.
  
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- Today the first package was moved back from EEL126 to Blue Crab for refurbishment. We are preparing for the  
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- Today the first package was moved back from EEL126 to Blue Crab for refurbishment. We are preparing for the installation of the subsytem on the third package. Will try to print the pre-amp lables from file and put them on the cards before the installation.
  
 
== Engineering update ==  
 
== Engineering update ==  
  
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- Without Bill we discussed the grounding hardware: if we want to use Rohacell or the rubber material suggested by Bill for filling the void between wire and cathode frames. Since we will have of the order of 100 such blocks per package, Simon said it's too much material and we better use Rohacell.  
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- Eugene aksed us before if we can use water for cooling instead of Fluorinert and if there are examples for that. At ATLAS all the cooling systems that are not servicable use some type of Fluorinert, while for the outer system woter cooling is used as well.
 +
 
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- We discussed what will happen in case of water leakage and if there's a way to put containers below the manifolds.
  
 
== Electronics update ==
 
== Electronics update ==
  
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- Nick: no news, waiting for different parts, grounding clips, LV stuff, to come.  
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- Chris: delay with the gorunding clips, they were supposed to be ready by today, but the company answered they will send us first article sometimes next week.
  
 
== Cable assignment ==
 
== Cable assignment ==
  
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- Vlad showed the new scheme linked above. First, wire/strip pre-amp cards are classified according to their rate levels. Wires: level 1 for the side connectors 1 and 4, and level 2 for the central connectors 2 and 3. Every F1TDC module (two connectors) has always one level 1 and one level 2 card. Strips: level 1 for connectors 1 and 8, level 2 for 2 and 7, level 3 for 3 and 6 and level 4/4' for 4,5/9 (the three central sectors). Each fADC125 (three connectors) is connected to either 4-1-3 card levels or 4'-2-2. In addition cards from different packages are combined already on module level to equalize the rate difference in the different packages, the latter estimated to be ~20%.  
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- Vlad: final scheme linked above. Same logic for distributing the loads within a package, but this time the packages are separated, i.e no mixture of cables from different packages.
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+
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- The presented scheme obviously confused many on the meeting since already on module/crate level you have mixture of crates, cells, sectors. Eugene insisted that if the package variation is relatively small we better have some order with respect to package/cell number when assigning modules/crates for them. The advantage of such scheme is also that we have better chances to keep the cables bundled up to the electronics, since cables from the different packages will end at different distances. Vlad will modify the scheme by assigning the cables from a package to a group of modules close together. 
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- Related to the cabling we discussed how the installation will be done in such a way that the cables will stay connected to the electronics. Without Tom, Tim or Bill our discussion was not very efficient. It was not clear for us how much extra cable will be needed during the installation and where will it go after that, how the installation carts will be removed minimazing the probability to damage the cables and so on. We will invite Tom/Tim for the next meeting to discuss this. What was clear for us is that mixing cables from different packages will make the installation even more difficult.
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== Gas system ==
 
== Gas system ==
  
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- Beni: Narciso is working on the system; expect specialized meeting soon soon.
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- Beni: Narciso has a preliminary scheme and scheduled a meeting beginning of next month.  
  
 
== Test set-up at 126 ==
 
== Test set-up at 126 ==
  
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- Beni: Elliot is working on CODA-Light for the two-crate system.
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- Beni: working on CODA-Light for the two-crate system, will move to Linux ROCs. Eugene: why not to use real CODA?
  
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- Vlad tested so far the cathodes of 3.5 cells on the first package. One bad pin on a LV connector found.
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- Vlad tested the cathodes of five cells (the 55Fe source is not strong enough for the sixth cell). All channels working, but same complains as before: need to fix the cooling tubes somehow to the cahmber. We will attach them to the holes at the perimeter of the frames with cable ties. Problems with the pins of two LV connectors.
  
 
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Revision as of 18:27, 28 June 2012

June 28, 2012 FDC meeting

Agenda

  1. FDC installation and cable routing (Tom Carstens)
  2. Production Construction Tracking (Dave)
    • Production status
    • Other: package transportation, subsystem installations
  3. Engineering update
    • Cooling system
  4. Electronics update (Chris)
  5. Cable assignment (Vlad)
  6. Gas system (Beni)
  7. Test set-up in 126 (Beni)
    • Cathode tests of the first package (Vlad)
  8. Other


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