Difference between revisions of "Minutes-10-18-2012"

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# Other
 
# Other
  
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= Minutes =
 
= Minutes =
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== Engineering ==
 
== Engineering ==
  
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- Bill made proposes an off-shell Temperature Control Unit 
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- Bill made ANSYS analyses of the cooling (document attached). Conclusion: the parallel supply as was designed before is good enough. The flows through different loops differ at most few percents. The temperature difference along one loop is less tha 2degC. Bill will go ahead with purchasing the Temperature Control Unit. He submitted also a PR for the fiducial hardware.   
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- What will happen if the Unit fails? Fernando: the voltage regulator on the pre-amp card has over-current and over-temperature protection, i.e. it will shut off the power to the card. In addition the control system should shut off the LV if the Temperature Control Unit doesn't work.
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== Electronics ==
 
== Electronics ==
  
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- Nick checked the board that was noisy at Blue Crab, couldn't see the noise, just one channel had on offset; will test it again at Blue Crab.
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- Chris: PR for the ground clips went through, it will take a month from now to get the clips. PR for the daughter card population not awarded yet, will have all the parts by tomorrow, the turn around
  
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- Fernando initiated discussion about the plans for the FDC and CDC testing (at the end of the meeting). According to the contract we are suppose to have first article (10 units initially, but later not specified in the contract) fADC125 in January, then 2 weeks to approve, then the full production will go till end of March/April. 
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- The plan for the FDC is to do partial testing of all the packages at 126 connecting all the wires to TDCs, but using only two fADC125 to test the cathodes. The full test of the packages (need 36 fADCs) is scheduled to start in April and, assuming one month per package, will finish by August. Then the packages will be installed on the cart at Blue Crab and moved to the Hall in the fall.
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- Fernando: what if there's a delay with the fADCs? We decided that we can test the first package(s) with half of the fADCs (18) and use 36 fADCS   
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when we have them, for the rest of the packages. At least one has to be tested with all the fADCs. For that Fernando will talk to the company to have 20 fADCs as first article.
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- fADC firmware: should not rely on that for the tests, except we should be able to change the addresses of the modules, now hard-coded. We should make contract with Gerard to develop the firmware.
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== Third package tests ==
 
== Third package tests ==

Revision as of 18:44, 18 October 2012

October 11, 2012 FDC meeting

Agenda

  1. Production Construction Tracking (Dave)
  2. Corrosion tests (Vlad)
  3. Engineering Ansys analyses of the cooling (Bill)
  4. Electronics (Chris, Nick)
  5. Third package tests FDC E-log (Beni)
  6. Other


Minutes

Participants: Eugene, Bill, Dave, Chris, Nick, Vlad, Simon, Beni, and Lubomir.

Production

- Dave: The the first package was assembled completely on Friday. Due to delays with the bas bottles (again GTS company), we started flushing with Nitrogen. Will have the bottles by the end of the next week hopefully. Anatoly is working on the cathodes for package #4. All but one are ready. Wire frame #29 will be deadened on Monday. Need Casey and Mike for several hours to string wire frame #30. These frames are neede for package #4 as well. PO for the foils was issued yesterday, expect them Nov 15, then Anatoly will start testing them. We need the foils for package #2 sometime in December.

- Vlad started applying HV on the new cells: could not reach more than ~1800V on two of the new cells. We suspect that the limitation comes from the gas, Nitrogen. We will try the same on a cell that worked before.

Cathode corrosion

- Vlad showed new results of the tests in the vacuum chamber at high temperature (~100degC), high humidity (~100%) in air. One of the samples showed >1MOhm after 4 days, while the other two are OK after 11 days. We have three samples, EPDM, Viton, and Viton+Apiezon, but the experiment was blinded, so we don't know which is which.

Engineering

- Bill made ANSYS analyses of the cooling (document attached). Conclusion: the parallel supply as was designed before is good enough. The flows through different loops differ at most few percents. The temperature difference along one loop is less tha 2degC. Bill will go ahead with purchasing the Temperature Control Unit. He submitted also a PR for the fiducial hardware.

Electronics

- Chris: PR for the ground clips went through, it will take a month from now to get the clips. PR for the daughter card population not awarded yet, will have all the parts by tomorrow, the turn around


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