Ran two simulations to check the background for the Neven's new collimator design.
The theta angle range is between 3 to 16 degree, and phi range is between -15.5 to
15.5 degree. The simulation used Richard Jones's gukine.F (including internal
Bremsstrahlung and energy loss upstream of the vertex), Neven's euclid file and
Juliette's bash file (both got from Juliette). Each simulation was done with 100k event.


• In the first simulation, only the primary e- and secondary photon were tracked.
  For the photon hitting Cerenkov bar at Z=530 cm (302< x <318 cm, -105< y < 105 cm)
  with energy > 1 MeV, the photon rate is 80.63 MHz, and the mean Q^2 = 0.0239 GeV^2.
  Below are a few tomographic plots showing the origin of these photons.
  
  1. Origin of the photons hitting the Z=530 cm plane (X vs. Z)
  
  
  
  
  
  2. Origin of the photons hitting the Z=530 cm plane (Y vs. Z)
  
  
  
  
  
  3. Origin of the photons (energy > 1 MeV) hitting the bar at Z=530 cm (X vs. Z)
  
  
  
  
  
  4. Origin of the photons (energy > 1 MeV) hitting the bar at Z=530 cm (Y vs. Z)
  
  
  
  
  
  





• In the second simulation, the primary e- and ALL secondary particles were tracked.
  For the photon hitting Cerenkov bar at Z=530 cm (302< x <318 cm, -105< y < 105 cm)
  with energy > 1 MeV, the photon rate is 100.2 MHz, and the mean Q^2 = 0.02252
  GeV^2. For the secondary positron hitting the bar with energy > 1 MeV, the positron
  rate is 0.75 MHz, and the mean Q^2 = 0.01608 GeV^2. For the electrons hitting the bar
  with energy > 1000 MeV, the electron rate is 563.9 MHz, and the mean Q^2 = 0.02372
  GeV^2. Below are a few tomographic plots showing the origin of these particles.
  
  1. Origin of the photons hitting the Z=530 cm plane (X vs. Z)
  
  
  
  
  
  2. Origin of the photons hitting the Z=530 cm plane (Y vs. Z)
  
  
  
  
  
  3. Origin of the photons (energy > 1 MeV) hitting the bar at Z=530 cm (X vs. Z)
  
  
  
  
  
  4. Origin of the photons (energy > 1 MeV) hitting the bar at Z=530 cm (Y vs. Z)
  
  
  
  
  
  




5. Origin of the positrons (energy > 1 MeV) hitting the bar at Z=530 cm (X vs. Z)





6. Origin of the positrons (energy > 1 MeV) hitting the bar at Z=530 cm (Y vs. Z)









7. Origin of the electrons (energy > 1000 MeV) hitting the bar at Z=530 cm (X vs. Z)





8. Origin of the electrons (energy > 1000 MeV) hitting the bar at Z=530 cm (Y vs. Z)