include/Geant4/G4CoherentPairProductionPhysics.hh

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0025 //
0026 // Author:      Alexei Sytov
0027
0028 #ifndef G4CoherentPairProductionPhysics_h
0029 #define G4CoherentPairProductionPhysics_h 1
0030
0031 #include "G4VPhysicsConstructor.hh"
0032 #include "G4CoherentPairProduction.hh"
0033
0034 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0035
0036 class G4CoherentPairProductionPhysics : public G4VPhysicsConstructor
0037 {
0038 public:
0039     G4CoherentPairProductionPhysics(const G4String& name =
0040                                     "Coherent Pair Production Physics");
0041
0042     ~G4CoherentPairProductionPhysics() = default;
0043
0044     void ConstructParticle() override;
0045     void ConstructProcess() override;
0046
0047     ///activate incoherent scattering
0048     ///(standard gamma conversion should be switched off in physics list)
0049     void ActivateIncoherentScattering(){fIncoherentScattering = true;}
0050
0051     ///set functions
0052
0053     ///set name of G4ChannelingFastSimModel from which an auto input should be performed
0054     void SetNameChannelingModel(const G4String& nameChannelingModel)
0055     {fNameChannelingModel=nameChannelingModel;}
0056
0057     ///set name of G4Region to where the G4ChannelingFastSimModel is active
0058     void SetNameG4Region(const G4String& nameG4Region)
0059     {fNameRegion=nameG4Region;}
0060
0061     void SetLowEnergyLimit(G4double energy){fLowEnergyLimit=energy;}
0062     void SetHighAngleLimit(G4double angle) {fHighAngleLimit=angle;}
0063     void SetPPKineticEnergyCut(G4double kineticEnergyCut) {fPPKineticEnergyCut=kineticEnergyCut;}
0064
0065     /// set the number of pairs in sampling of Baier-Katkov Integral
0066     /// (MC integration by e+- energy and angles <=> e+- momentum)
0067     void SetSamplingPairsNumber(G4int nPairs){fNMCPairs = nPairs;}
0068
0069     /// set the number of particle angles 1/gamma in pair production
0070     /// defining the width of the angular distribution of pair sampling
0071     /// in the Baier-Katkov Integral
0072     void SetChargeParticleAngleFactor(G4double chargeParticleAngleFactor)
0073     {fChargeParticleAngleFactor = chargeParticleAngleFactor;}
0074
0075     /// set number of trajectory steps of a single particle (e- or e+)
0076     void SetNTrajectorySteps(G4int nTrajectorySteps)
0077     {fNTrajectorySteps = nTrajectorySteps;}
0078
0079 private:
0080
0081     ///flag of simulation of incoherent scattering
0082     G4bool fIncoherentScattering = false;
0083
0084     ///name of G4ChannelingFastSimModel from which an auto input should be performed
0085     G4String fNameChannelingModel = "ChannelingModel";
0086
0087     ///name of G4Region to where the G4ChannelingFastSimModel is active
0088     G4String fNameRegion = "Crystal";
0089
0090     G4double fLowEnergyLimit = 1*CLHEP::GeV;
0091     G4double fHighAngleLimit = 50*CLHEP::mrad;
0092
0093     ///minimal kinetic energy of a charged particle produced
0094     G4double fPPKineticEnergyCut = 1*CLHEP::MeV;
0095
0096     ///Monte Carlo statistics of e+- pair sampling in Baier-Katkov for 1 photon
0097     G4int fNMCPairs = 150;
0098
0099     G4double fChargeParticleAngleFactor = 4; // number of particle angles 1/gamma:
0100         // more fChargeParticleAngleFactor => higher paramParticleAngle
0101
0102     ///number of trajectory steps of a single particle (e- or e+)
0103     G4int fNTrajectorySteps=250;
0104
0105 };
0106
0107 #endif