Difference between revisions of "Minutes-11-14-2013"

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(Created page with "November 14, 2013 FDC meeting = Agenda = # Installation status[http://www.jlab.org/Hall-D/detector/fdc/installation/FDC_installation.pdf] # Engineering (Bill) #* FDC survey #* C...")
 
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= Minutes =
 
= Minutes =
  
Participants: Eugene, Fernando, Dave, Nick, Simon, Vlad, Beni, Bill(came later), and Lubomir.
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Participants: Eugene, Bill, Dave, Nick, Chris, Simon, Vlad, Beni, and Lubomir.
  
 
== Installation ==
 
== Installation ==
  
- FDC has been moved on the platform and inserted in the magnet last Friday. Inside the magnet a survey of the downstream and upstream side has been done. Also FDC has been moved inside the magnet, and re-surveyed. Repeatability was very good (except for z-direction translation). Once the reflectors are installed the FDC will be moved again to the floor to survey the reflectors w.r.t. the already surveyed points. The work on the mesh has not started yet.
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- Bill, Casey, and Dave glued the 16 reflectors to the gussets of the packages (four per package). The survey group started working on the new targets yesterday and they are working now. Preliminary findings: if looking along z they found distance between the first and last package to the be the same as the measured one within 0.5mm (measured with measuring tape?). They also
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- Bill received one reflector (made out of fused silica) and glued it to the holder. It has been tested then by the survey group: they found that it can be used at up to 6 m distance from the Fero unit with a resolution of 0.1 mm. The resolution was estimated from the repeatability of the measurements, keeping the positions the same. The new 16 reflectors (regular glass) have arrived and Bill will glue them to the holders. He will give one to the survey group for tests again, since the material is different. At the beginning of next week he will glue the holders to the gusset rings of the packages; there's a jig to fix their positions.
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- The chilled water system must be ready now. According to Bill it will take just several hours to connect the chiller to the FDC and the chilled water, then we can test the FDC for leakage.
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== Engineering ==
 
== Engineering ==
  
- Thickness of the packages: the thickness of a cell used so far in the simulation and data analyses was 2.1254 cm. By comparing the angles reconstructed from the Indiana chambers to those from the FDC, Lubomir estimated the thickness should be 2.15 +/- 0.1 cm (for the third package). This created some confusion that the nominal value may differ from the measured one due to the thickness of the glue on the cathodes that is not well controllable. However the problem was solved when Bill looked at the recent I-deas model and found the value there's 2.145 cm (after the meeting, xml file attached). He calculated also from the model the thickness of the full package: 14.42 cm and compared it to the results of the gusset flatness survey (attached) which gives 14.43 cmm for the first package: very good agreement! Bill is going to look at the other packages too.
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- Thickness of the packages: the thickness of a cell used so far in the simulation and data analyses was 2.1254 cm. By comparing the angles reconstructed from the Indiana chambers to those from the FDC, Lubomir estimated the thickness should be 2.15 +/- 0.1 cm (for the third package). This created some confusion that the nominal value may differ from the measured one due to the thickness of the glue on the cathodes that is not well controllable. However the problem was solved when Bill looked at the recent I-deas model and found the value there's 2.145 cm (after the meeting, xml file attached). He calculated also from the model the thickness of the full package: 14.42 cm and compared it to the results of the gusset flatness survey (attached) which gives 14.43 cm for the first package: very good agreement! Bill is going to look at the other packages too.
  
 
== Electronics ==
 
== Electronics ==

Revision as of 18:09, 14 November 2013

November 14, 2013 FDC meeting

Agenda

  1. Installation status[1]
  2. Engineering (Bill)
    • FDC survey
    • Cooling system
  3. Electronics (Chris, Nick)
  4. Mini-DAQ for FDC tests (Beni)
  5. Full electronics test analyses (Lubomir)
  6. Other