Pion Meeting March 26 2021 11AM ET

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Agenda

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

Attendance

David, Elham, Raj, Jim, Wouter

Minutes

  • Elham: pion detector simulations with moller and pion generator
    • Effect of moving lucite detector inwards has a smaller effect than increasing donut outer radius on the pi/e photo-electron rate
      • Combination of 26 cm lead donut, with shorter (6cm) and shifted lucite (same inner edge of lucite) gives good result
    • Changing concrete and lead radial and longitudinal thickness independently:
      • lead has most impact, but thinner lead at larger radial extent is also good
      • looks like weight can be relatively constant in optimization
    • Showermax mirror box bug fixed and wall thickness reduced
      • no effect on ratios
    • Reduce thickness off donut support flanges from 0.75" to 0.01"
      • no effect on ratios
  • Raj: pion detector simulations with beam generator
    • rates consistent with moller generator results from Elham
    • but photo-electron rates appear consistent with zero and much smaller than the results from Elham
  • TODO
    • verify how st.d. is defined: uncertainty on rmv or is there an additional factor sqrt(n) required?
    • how does geant4 treat primary electrons in moller scattering? is one electron still primary?
    • is moller scattering turned on for geant4? verify physics list
    • verify uncertainties on moller rates and moller photo-electron rates with 'chunking' method
    • run moller simulation on electroweak, store random state, reproduce visualization for events with charged particles in lucite
    • Elham will run beam generator to compare with Raj
  • Vacuum levels in beam pipe
    • can we run at 1 Torr He in beamline?
    • TODO Wouter to work with Cip on implementing
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