Difference between revisions of "Minutes-9-13-2012"

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(Created page with "September 13, 2012 FDC meeting = Agenda = # Production [http://www.jlab.org/Hall-D/detector/fdc/production/FDC_Construction_September_13_2012.xlsx Construction Tracking] (Dave) ...")
 
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= Minutes =
 
= Minutes =
  
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Participants: Eugene, Bill, Dave, Simon, Vlad, Beni, and Lubomir
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Participants: Eugene, Bill, Dave, Simon, Chris, Vlad, Beni, and Lubomir
  
 
== Production ==
 
== Production ==
  
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- Dave: Need to put the cards on another two cathodes and we will be ready with the first three cells that will go in package #1. Chris put the resistors on one PCB set and Casey started today making the PCB ring for wire frame #28. It will be laminated beginning of next week and Anatoly will put and test the HV caps before the end of the next week.  
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- Dave: 7 cathodes ready, another 5 need daughter cards to be glued. Will have 200 new cards (Lubomir) beginning of next month, we better use them for the rest of the cathodes; so far we have 3 cathodes with refurbished daughter cards. One new wire frame (#29) is ready for stringing, Anatoly just put HV caps and tested it.  
  
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- Eugene: in order to expedite the solenoid testing, the plan so far is that three of our techs will be taken from us for two months, October and November. Dave and Anatoly will still work on the FDC. In case we need somebody for a short time, like half a shift, we should discuss this with Tim and Tom in advance.
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- Lubomir: we may try to fix the wire frames #27 and #28 that are drawing high current. Suspect the via of the HV trace that connects the bottom trace just against the Rohacell.  
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- Just for the record: starting about Sunday evening or Monday morning (09/02-03) the humidity in the clean room was above 60%. On Tuesday it was 63% all day. A faulty fan was found that was replaced on Wednesday before lunch; in the afternoon the humidity returned back to normal for the season, 47-49%. In the clean room we have only the fourth package with four cell assembled being flushed with Nitrogen.
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- Vlad updated the grounding scheme including the ~100 additional grounds, that is linked above.
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== Cathode corrosion ==
 
== Cathode corrosion ==
  
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- Another test with Viton+Apiezon was done in the vacuum chamber, this time using a spacer ring to have the right pressure on the O-ring applied with a lead brick. This time the lamps were kept on continuously over the holiday weekend; one of them burned on Monday. The copper changed color (picture attached). Unlike the previous test (with higher pressure) we could see only tiny holes through the copper using microscope and it's not not clear if they are a result of mechanical or chemical reaction.
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- On Monday we started a test with a cathode (the demo one) one side coated 
  
 
- Olga analyzed the sample from the previous test, Viton+Apiezon at high pressure, and this time there's no sulfur visible, except at one place outside of the O-ring and Apiezon area, most likely pollution.
 
- Olga analyzed the sample from the previous test, Viton+Apiezon at high pressure, and this time there's no sulfur visible, except at one place outside of the O-ring and Apiezon area, most likely pollution.

Revision as of 17:11, 13 September 2012

September 13, 2012 FDC meeting

Agenda

  1. Production Construction Tracking (Dave)
  2. Cathode corrosion
    • Recent tests
  3. Engineering (Bill)
  4. Electronics (Chris, Nick)
  5. Third package tests FDC E-log (Beni)
  6. TDR, pages 132-145 (Lubomir)
  7. Other


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