Π polarizability Meeting May 5, 2021

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Meeting Time And Location

09:00 EST (JLab time) Electronics Discussion

REMOTE during Covid-19

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Action Items

Agenda (Electronics Discussion) 09:00 am

  1. Announcements
  2. Previous CPP Electronics meeting: Feb 3, 2021
  3. Previous CPP: Apr 28, 2021
  4. CPP and NPP Readiness Review
  5. FADC cables
  6. LV supplies/cable
  7. HV supply/cable
  8. Slow Controls
  9. Heating of electronics
  10. draft TOSP for testing in EEL 126(TOSP # 115501)
  11. Next meeting

Minutes

Attending: Albert, Fernando, Beni, Chris, Hovanes, Mark, Rory, Tim, Elton, Alex, Ilya

  1. Announcements
    • We have submitted our response to the ERR. Stepan and Patrizia have acknowledged receipt.
  2. Previous CPP Electronics meeting: Feb 3, 2021
  3. CPP and NPP Readiness Review
  4. FADC cables
    • Chris has ordered a short section of a new cable that should work. He has not had time to put on the connectors.
    • We need to confirm length of cables with Stephanie, which we can do tomorrow at the CPP design meeting (Elton)
    • We can use the cables used for the prototype to get the first MWPCs working in the EEL. Need to put our hands on them. (Check with Mark Stevens)
  5. LV supplies/cable
    • Recall: Each chamber requires two +5 and two -5 supplies: Rory: Each supply draws 1 A, i.e. 2x2=4 A per chamber -> 20 W/chamber
    • Fernando: Each MPOD channel delivers 5 A -> can channel supplies one chamber -> need six channels.
    • Discussion about removing banana plugs from chamber and connecting chamber to an appropriate connector that can be used to plug into a "L" transition piece to the D-sub connector to MPODs. Final determination will be made when the first shipment of chambers comes to JLab.
    • Rory: the LV on the chamber is separated into a right and left side; both sides need connections to +/-5 V.
    • The MPODs will be located in the DIRC/CCAL LV crate.
  6. HV supply/cable
    • There is a CAEN HV crate on the upstream south rack and has sufficient space, presently used for CCAL. There is a Drift Chamber card, but it takes the Radial connector (not SHV)
    • We require a single SHV connection per MWPC plane.
    • Ideally we can add a noise filtering box on the output of the HV supplies before transition to the SHV connector.
    • Beni will check to see if the HV on the CDC is segmented by quadrants so we could potentially borrow one of the existing filtering boxes for the MWPCs.
  7. Slow Controls:
    • Hovanes: Once the hardware has been defined, CPP (Beni) should present requirements to the Slow Controls meeting, so that responsibilities can be assigned and the software can be developed
    • Hovanes: Does the Ar/CO2 gas stratify in the premixed bottles? (Rory will inquire)
    • Systems: HV, LV, gas, heat monitoring in enclosure
  8. Heating of electronics
    • Rory: Plan to add a swage connector for gas that could be used to supply dry nitrogen to each enclosure.
  9. draft TOSP for testing in EEL 126(TOSP # 115501)
  10. Next meeting
    • We will reconvene once the first shipment of chambers have arrived and we have had time to evaluate connections.

Action Items for next meeting

  1. Obtain lengths of cables (Elton)
  2. Check with Mark Stevens about the location of cables used for prototype (Chris Stanislav)
  3. Check mapping of HV on the CDC to see if they map onto a single quadrant (Beni)
  4. Add swage gas connection to MWPC electronic enclosures (Rory)
  5. Investigate if settling (stratification) of Ar/CO2 is a problem in premixed bottles (Rory)
  6. Feedback to draft TSOP developed by Beni (Rory, Fernando, Elton)
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