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26 ////////////////////////////////////////////////////////////////////////////////
27 // Class: G4AdjointBremsstrahlungModel
28 // Author: L. Desorgher
29 // Organisation: SpaceIT GmbH
30 ////////////////////////////////////////////////////////////////////////////////
31 //
32 // Adjoint Model for e- Bremsstrahlung.Adapted from G4eBremsstrahlungModel
33 // Use of a simple biased differential cross section (C(Z)/Egamma) allowing a
34 // rapid computation of adjoint CS and rapid sampling of adjoint secondaries.
35 // In this way cross section matrices are not used anymore, avoiding a long
36 // computation of adjoint brem cross section matrices for each material
37 // at initialisation. This mode can be switched on/off by selecting
38 // SetUseMatrix(false)/ SetUseMatrix(true) in the constructor.
39 //
40 //-------------------------------------------------------------
41
42 #ifndef G4AdjointBremsstrahlungModel_h
43 #define G4AdjointBremsstrahlungModel_h 1
44
45 #include "globals.hh"
46 #include "G4VEmAdjointModel.hh"
47
48 class G4AdjointCSManager;
49 class G4EmModelManager;
50 class G4ParticleDefinition;
51
52 class G4AdjointBremsstrahlungModel : public G4VEmAdjointModel
53 {
54 public:
55 explicit G4AdjointBremsstrahlungModel(G4VEmModel* aModel);
56
57 G4AdjointBremsstrahlungModel();
58
59 ~G4AdjointBremsstrahlungModel() override;
60
61 void SampleSecondaries(const G4Track& aTrack, G4bool isScatProjToProj,
62 G4ParticleChange* fParticleChange) override;
63
64 void RapidSampleSecondaries(const G4Track& aTrack, G4bool isScatProjToProj,
65 G4ParticleChange* fParticleChange);
66
67 G4double DiffCrossSectionPerVolumePrimToSecond(
68 const G4Material* aMaterial,
69 G4double kinEnergyProj, // kinetic energy of the primary particle before
70 // the interaction
71 G4double kinEnergyProd // kinetic energy of the secondary particle
72 ) override;
73
74 G4double AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
75 G4double primEnergy,
76 G4bool isScatProjToProj) override;
77
78 G4AdjointBremsstrahlungModel(G4AdjointBremsstrahlungModel&) = delete;
79 G4AdjointBremsstrahlungModel& operator=(
80 const G4AdjointBremsstrahlungModel& right) = delete;
81
82 private:
83 void Initialize();
84
85 G4EmModelManager* fEmModelManagerForFwdModels;
86 G4AdjointCSManager* fCSManager;
87 G4ParticleDefinition* fElectron;
88 G4ParticleDefinition* fGamma;
89
90 G4double fLastCZ = 0.;
91
92 G4bool fIsDirectModelInitialised = false;
93 };
94
95 #endif
96