CountingDaq 210623

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Meeting information

 Meeting time:  3:00pm Eastern
   
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Agenda

• Follow-up from collaboration meeting discussions
  • Keep the amplifiers in the plan, but shift them to the SBS bunker. All PMT signals will be routed from detectors, to detector-side patch-panels, to long cables, to bunker-side patch panels (?), then to the amplifiers. Will then just need short patch cables from amplifiers to FADC.
  • Numbers of MPD boards. Nilanga recommends planning for 1 MPD per GEM module, for a total of 30. Splitting them into two crates would give either 16+14 (with 4 septants in one, and three septants plus the pion GEMS in the other) or 18+12 (if the pion gems are instrumented in the crate supporting four septants). If the pion GEM cables can't reach, we'd need three crates with 16+12+2 boards.
  • Mitigation of radiation hazard to MPDs
    • I (Paul) am confused about the radiation hazard to the MPDs. The current simulation with the downstream bunker design (DocDB 759) gives 7.5e10 NIEL/cm2. Previously we've indicated commercial electronic components are generally robust to 1e13 NIEL/cm2. What is Paul missing? Or is it that we want to apply ALARA principles to the electronics dose, which does make sense.
    • A concept proposed in emails or the chat during the meeting would be to disconnect the MPDs during production running and keep them in the SBS bunker (each crate would be on a wheeled cart to allow "quick" movement). The simulation of the SBS bunker gives 1e9 NIEL/cm2. Each MPD has up to 4 analog HDMI, 1 digital HDMI, and one optical cable.
      • We should check the robustness and reproducibility of the HDMI cable connections into the MPD.
        • How many times would we expect to go to tracking mode per run period (and altogether)?
        • Maybe need an extra patch panel next to the crate to allow us to easily swap a damaged cable (the patch panel end should stay connected)? Does that change noise, robustness, or reproducibility?
      • Need to think about what tests are needed each time to verify we've got everything connected correctly, and likelihood of needing multiple accesses to swap/reseat cables
      • If we only have the MPDs near the detectors during tracking, can we avoid having them in mini-bunkers? Should simulate an unshielded dose at low beam current
      • Should think about personnel exposure during installation/removal of the crates. Think about the likely path we'd need to take to get the crates between SBS bunker and detector location and the work time at the detector location
• Tests we should do
  • Single FADC readout
    • Include tests with long cables and preamplifier? Coordinate with Michael to test with prototype base & PMT?
  • Setting up a single element trigger with FADC & VTP
  • Setting up a coincidence element trigger with FADC & VTP
  • Combining triggers from two VTP crates
  • Robustness/reproducibility of HDMI connection to MPD
  • Noise variation with HDMI cable length
  • Readout of GEM through VTP
• Activity updates
  • Restarting the counting mode daq design document on JLab OneDrive: [1]
• General discussion

Minutes

Meeting recording on BlueJeans.com:

Participants: