More electromagnetic physics

As this example is intended to be used as an interactive support to detector lessons we are going to play more with the calorimeter example.

Changing gun energy

You can do that with :

Compared to results in "First run", now the positrons are more quickly stopped by the lead. Good part of the energy is abosrbed in the first and second plate (whilst it was in the third plate with 1 GeV). You should see something as :

calo_em_positron_100.png

Shooting protons

GUI steps :

In general proton go straight by only depositing energy through "multiple scattering" with atoms in lead and liquid argon. The histogram is more flat than with eletrons or positrons but with a slight descending slope. From time to time a proton do a nuclear interaction with an atom producing a picture as the below :

calo_em_proton_1000.png

Shooting muons

GUI steps :

Muons go straight by only depositing energy through multiple scattering and emitting photons by bremsstrahlung. The histogram is even more flat than with protons :

calo_em_muon_1000.png

Changing the material of plates

GUI steps :

Positrons of 1 GeV are shooted and we see (comparing to "First run") that now most energy is deposited in the second plate (and not the third as in lead). This is due to the higher density of uranium compared to lead.

calo_em_positron_1000_uranium.png

With aluminium (very light material) we have :

calo_em_positron_1000_aluminium.png