In G4ParticleWithCuts::SetCuts() method,

1. CalcEnergyCuts()

• As for each material
  • build a range table as a function of kinetic energy
  • convert the given range to kinetic energy
    
  2. BuildPhyicsTable()
• As for each process in the process manager
  make its physics table by G4VProcess::BuildPhysicsTable()
  
  • PhysicsTable is a collection of cross sections (G4PhysicsVector) for all materials

In Geant4 each particle type has only one cut value in terms of range

• (In Geant3 cut value is defined in kinetic energy)

Kinetic energy corresponding to the range cut is calculated for each material

These functions are implemented in G4ParticleWithCuts class

• void SetCuts(G4double) set the cut value in range
• G4double GetLengthCuts() get the cut value in range
• G4double* GetEnergyCuts() get a array of energy cut values

G4Track

• has position, time and other information for tracking
  • (G4Step, G4VTouchable etc.)
• has G4DynamicParticle

G4DynamicParticle

• has momentum, energy, polarization etc.
• has G4ParticleDefinition

G4ParticleDefintion

• has name, mass, charge, decay table etc.
• has a process manager
• has cut values

G4ProcessManager has

• a list of all applicable processes
• 6 process vectors which are lists of processes invoked in GPIL/DoIt loops with ordering

Ordering parameters

• G4int AddProcess(G4VProcess * aProcess,
  G4int ordAtRestDoIt,
  G4int ordAlongSteptDoIt,
  G4int ordPostStepDoIt );
• a process with smaller ordering parameter will be invoked earlier in corresponding DoIt loop.
• a process with negative ordering parameter will never be invoked.

to get the current G4Event object pointer

const G4Event* evt =

fpEventManager->get_const_currentEvent();
G4Event* evt =
fpEventManager->get_nonconst_currentEvent();