Start Counter Background Studies

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  • Seema and Sasha's Old Background Study: [1]
  • Sasha's Howto [2]

Pure EM Background

  • Generated 100K dummy events using
$ genphoton -M 100000 -Pmax 0.00001 -Pmin 0.000005 -Thetamin 0. -Thetamax 0.001 -o file_out.ascii
  • Convert the ascii events into HDDM format and smear the z-vertex across the entire 30cm long target

NB: This step is not necessary as HDGEANT automatically smears the vertex across all three dimensions

$ genr8_2_hddm -V"0 0 50 80" file_out.ascii 
  • Use the following control.in file to process the events through HDGEANT (from latest sim-recon version) [3]
    • The minimum energy for the photon beam was lowered to 1.2 MeV to look at hits contribution in SC from 50 MeV photons: BEAM 12. 9. 0.0012
    • The background rate or flux for this minimum energy is 2.2e9 photons/s: BGRATE 2.2
    • The photon pileup window is set to 100ns: BGGATE 0. 100.
    • The following EM processes are turned on:
      • Compton Scattering: COMP 1
      • Pair Production: PAIR 1
      • Energy Loss: LOSS 1
  • Additional cuts in HDGEANT:
    • The energy threshold in for hits in SC is 150 MeV
    • The time window for two hit resolution is 25 ns
  • The hits are then smeared using mcsmear
  • Plots
    • Rates [4]
    • Hit Multiplicity [5]
    • R vs Z hit [6]
    • Y vs X hit [7]