Pion Meeting July 9 2021 11AM ET

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• Bluejeans link: 420 107 252
• Dial-in: 408-740-7256 (US), 888-240-2560 (US Toll Free), 408-317-9253 (Alternate number)

Agenda

1. Updates on pion detector studies (Elham) [1]
2. Beam generator simulations (Raj)

Attendance

David, Elham, Jim, Julia, Raj, Wouter

Minutes

• Pion detector studies (David)
  • Rate weighting does not make a difference [2]
  • Light into lucite comes from corners, and reducing lucite size increases pi/e ratio by about factor of two [3]
• Pion detector studies (Elham)
  • Changing angles of lead donut or phi acceptance of lucite doesn't affect pi/e ratio much [4]
    • pions illuminate front face of lucite uniformly, significant reduction of high energy electrons
    • why are there so many photoelectrons from low energy electrons and why is it independent of lucite size?
      • TODO: which events cause most photoelectrons?
        • plot the position of events in lucite 8001 for events which have number of photoelectrons in 8000 above a certain threshold
        • plot the number of photoelectrons in 8000 for events which have a momentum in lucite 8001 above versus below 2 MeV
        • define low-energy for electrons as the ones that are below 2 MeV but ALSO above Cerenkov threshold
• Pion detector studies II (David)
  • Showermax leakage [5]
    • primary electrons lose 3.5 GeV in showermax, but leakage primary electrons lose a lot less
    • most electrons that cause leakage are at sin(phi) = 0.06 or ~3.4 degrees
    • some electrons generated at small angles, not sure where they come from
  • Primaries exiting showermax [6]
• Pion detector studies II (Elham)
  • Tilted showermax [7]
    • Pions shouldn't change since they don't care about showermax, so likely factor 10 division needed
    • High energy pions unchanged, high energy electrons reduced by factor 2
    • Low energy pions statistically zero, low energy electrons reduced slightly
      • TODO:
        • repeat with 5M events to avoid having inconsistent rate conversions