Difference between revisions of "Minutes-4-11-2013"

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- Dave for the spare package: Two wire planes (#2 and #3) have been deadened, two more remaining. The filed wire on #2 was fixed (broke during deadening). It turned out we don't have enough HV cables (short cables with male connectors) that are soldered on the wired frames, and we have order them. This is because we originally planned for 4 spare cells.   
 
- Dave for the spare package: Two wire planes (#2 and #3) have been deadened, two more remaining. The filed wire on #2 was fixed (broke during deadening). It turned out we don't have enough HV cables (short cables with male connectors) that are soldered on the wired frames, and we have order them. This is because we originally planned for 4 spare cells.   
  
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- Package #3 repair: the three field wires on the wire frame of cell #6 were fixed and on Monday we install the sixth cell on the package upside-down. We ended up holding the spacer ring with fingers  
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- Package #3 repair: the three field wires on the wire frame of cell #6 were fixed and on Monday we installed the sixth cell on the package upside-down. We ended up holding the spacer ring with fingers (taping to polyethylene didn't work) when installing it together with the wire frame, but it was successful: no gas leakage was found. Since Monday we are flushing the package with gas, oxygen went down to 700ppm and today we applied 2000V/-500V so far without problems. We will continue testing it till Monday, but already tomorrow we can start replacing the cooling tubes - they have to be positioned in a different way as for the other packages. Next week we plan to finish also with the grounding connections, HV connections and with the installation of the manifolds. Then we will move it (during the week of 22-26 of April) to 126 for testing with the full electronics. Fernando: by that time we will have 30 fADC125 ready to be used (3 will go to CMU). 
  
 
== Installation ==
 
== Installation ==
  
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- Yesterday, there was a "FDC cable installation" meeting on which Rich Getz presented his new plan shown on the three pictures attached above. Important change: the cables coming from the back of the installation cart don't have to run to the front of the magnet to reach the cable trays. This is possible because of the new openings in the floor  next to the rails for the carts. These openings are just on the top of a new cable tray. To support the cables on the top, there will be a temporary movable frame. Beni suggested how to organize the cables on the top to make the insertion easier. Bill explained how the cables will be attached in between the packages and how the strain relief will be provided: using carbon tubes at the periphery.  
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- The channel assignment schemes are attached above. Fernando explained how to use the first one, the channels/cables are ordered according the their rack, crate, slot numbers. The other two files (Vlad's) represent the view from the detector side, separately for the signal and LV cables. The cables are ordered in increasing azimuthal angle, started from the top counterclockwise when looking from the upstream side.  
  
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- Everybody thinks this is a very good solution for the FDC cabling. Another important feature: the CDC cables  will use a separate cable tray at the bottom below the platform. Thus, the installations of the FDC and CDC cables become independent.  
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- The schedule for the FDC installation and related activities (linked above) was updated from the recent version 3 of the rebaselined schedule. There are important changes related to the electronics: the installation of the fADC125s in the racks is postponed by ~8 weeks, starts Nov 23. If this is the case, the FDC installation has to be postponed as well. Eugene: this was done because of the manpower spike for this period of time.  
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-  LV cabling: in the current scheme all the FDC LV cables (140) are connected to one rack. Fernando advocated to keep this scheme and bring half of the LV cables from one side to the other somehow at the front of the magnet. Doing this directly on the mesh might be problematic due to the small distance to BCAL, but Bill will look at this. Attaching additional support ring at the front of the magnet for the CDC cables (Bill) may help.  
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- We discussed possible practicing at Blue Crab with the following configuration. We will use two installation carts, going downstream, one for one half of the mesh cylinder, and the other for one FDC package and the mock-up. The idea is to prototype one quadrant of the signal cables (132). The cables for that quadrant will come from the FDC package and the rest will be attached to the mock-up representing the other three packages. The cables will be attached up to the end of the mesh running between the rails. We have all the major parts to do this. The bearings on the mesh have to be installed. Will move also 132 signal cables from 117 to Blue Crab.
 
- We discussed possible practicing at Blue Crab with the following configuration. We will use two installation carts, going downstream, one for one half of the mesh cylinder, and the other for one FDC package and the mock-up. The idea is to prototype one quadrant of the signal cables (132). The cables for that quadrant will come from the FDC package and the rest will be attached to the mock-up representing the other three packages. The cables will be attached up to the end of the mesh running between the rails. We have all the major parts to do this. The bearings on the mesh have to be installed. Will move also 132 signal cables from 117 to Blue Crab.

Revision as of 16:59, 11 April 2013

April 11, 2013 FDC meeting

Agenda

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


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