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26 /////////////////////////////////////////////////////////////////////////////////
27 // Class: G4AdjointAlongStepWeightCorrection
28 // Author: L. Desorgher
29 // Organisation: SpaceIT GmbH
30 /////////////////////////////////////////////////////////////////////////////////
31 //
32 // Documentation:
33 //
34 // Continuous processes act on adjoint particles to continuously correct their
35 // weight during the adjoint reverse tracking. This process is needed when
36 // the adjoint cross sections are not scaled such that the total adjoint cross
37 // section matches the total forward cross section. By default the mode where
38 // the total adjoint cross section is equal to the total forward cross section
39 // is used and therefore this along step weightcorrection factor is 1. However
40 // in some cases (some energy ranges) the total forward cross section or the
41 // total adjoint cross section can be zero. In this case the along step weight
42 // correction is needed and is given by exp(-(Sigma_tot_adj-Sigma_tot_fwd).dx)
43 //
44 //-------------------------------------------------------------
45
46 #ifndef G4AdjointAlongStepWeightCorrection_h
47 #define G4AdjointAlongStepWeightCorrection_h 1
48
49 #include "globals.hh"
50 #include "G4VContinuousProcess.hh"
51
52 class G4AdjointCSManager;
53 class G4MaterialCutsCouple;
54 class G4ParticleDefinition;
55 class G4ParticleChange;
56 class G4Step;
57 class G4Track;
58
59 class G4AdjointAlongStepWeightCorrection : public G4VContinuousProcess
60 {
61 public:
62 explicit G4AdjointAlongStepWeightCorrection(
63 const G4String& name = "ContinuousWeightCorrection",
64 G4ProcessType type = fElectromagnetic);
65
66 ~G4AdjointAlongStepWeightCorrection() override;
67
68 G4VParticleChange* AlongStepDoIt(const G4Track&, const G4Step&) override;
69
70 void ProcessDescription(std::ostream&) const override;
71 void DumpInfo() const override { ProcessDescription(G4cout); };
72
73 G4AdjointAlongStepWeightCorrection(G4AdjointAlongStepWeightCorrection&) =
74 delete;
75 G4AdjointAlongStepWeightCorrection& operator=(
76 const G4AdjointAlongStepWeightCorrection& right) = delete;
77
78 protected:
79 G4double GetContinuousStepLimit(const G4Track& track,
80 G4double previousStepSize,
81 G4double currentMinimumStep,
82 G4double& currentSafety) override;
83
84 private:
85 void DefineMaterial(const G4MaterialCutsCouple* couple);
86
87 const G4MaterialCutsCouple* fCurrentCouple = nullptr;
88 G4AdjointCSManager* fCSManager = nullptr;
89 G4ParticleChange* fParticleChange;
90
91 G4double fPreStepKinEnergy = 1.;
92 };
93
94 inline void G4AdjointAlongStepWeightCorrection::DefineMaterial(
95 const G4MaterialCutsCouple* couple)
96 {
97 if(couple != fCurrentCouple)
98 {
99 fCurrentCouple = couple;
100 }
101 }
102
103 #endif
104