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1 //
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24 // ********************************************************************
25 // ********************************************************************
26 // *********************************************************************
27 // | |
28 // | G4LowEPPolarizedComptonModel-- Geant4 Monash University |
29 // | polarised low energy Compton scattering model. |
30 // | J. M. C. Brown, Monash University, Australia |
31 // | |
32 // | |
33 // *********************************************************************
34 // | |
35 // | The following is a Geant4 class to simulate the process of |
36 // | bound electron Compton scattering. General code structure is |
37 // | based on G4LowEnergyCompton.cc and |
38 // | G4LivermorePolarizedComptonModel.cc. |
39 // | Algorithms for photon energy, and ejected Compton electron |
40 // | direction taken from: |
41 // | |
42 // | J. M. C. Brown, M. R. Dimmock, J. E. Gillam and D. M. Paganin, |
43 // | "A low energy bound atomic electron Compton scattering model |
44 // | for Geant4", NIMB, Vol. 338, 77-88, 2014. |
45 // | |
46 // | The author acknowledges the work of the Geant4 collaboration |
47 // | in developing the following algorithms that have been employed |
48 // | or adapeted for the present software: |
49 // | |
50 // | # sampling of photon scattering angle, |
51 // | # target element selection in composite materials, |
52 // | # target shell selection in element, |
53 // | # and sampling of bound electron momentum from Compton profiles. |
54 // | |
55 // *********************************************************************
56 // | |
57 // | History: |
58 // | -------- |
59 // | |
60 // | Jan. 2015 JMCB - 1st Version based on G4LowEPComptonModel |
61 // | Feb. 2016 JMCB - Geant4 10.2 FPE fix for bug 1676 |
62 // | Nov. 2016 JMCB - Polarisation tracking fix in collaboration |
63 // | of Dr. Merlin Reynaard Kole, |
64 // | University of Geneva |
65 // | |
66 // *********************************************************************
67
68 #ifndef G4LowEPPolarizedComptonModel_h
69 #define G4LowEPPolarizedComptonModel_h 1
70
71 #include "G4VEmModel.hh"
72 #include "G4PhysicsFreeVector.hh"
73 #include <limits>
74 #include "G4Electron.hh"
75 #include "G4ParticleChangeForGamma.hh"
76 #include "G4LossTableManager.hh"
77 #include "G4VAtomDeexcitation.hh"
78 #include "G4AtomicShell.hh"
79 #include "G4Gamma.hh"
80 #include "G4ShellData.hh"
81 #include "G4DopplerProfile.hh"
82 #include "G4Log.hh"
83 #include "G4Exp.hh"
84 #include "G4ForceCondition.hh"
85
86 class G4ParticleChangeForGamma;
87 class G4VAtomDeexcitation;
88 class G4ShellData;
89 class G4DopplerProfile;
90
91 class G4LowEPPolarizedComptonModel : public G4VEmModel
92 {
93 public:
94 explicit G4LowEPPolarizedComptonModel(const G4ParticleDefinition* p = nullptr,
95 const G4String& nam = "LowEPComptonModel");
96 virtual ~G4LowEPPolarizedComptonModel();
97
98 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
99
100 void InitialiseLocal(const G4ParticleDefinition*,
101 G4VEmModel* masterModel) override;
102
103 void InitialiseForElement(const G4ParticleDefinition*, G4int Z) override;
104
105 G4double ComputeCrossSectionPerAtom( const G4ParticleDefinition*,
106 G4double kinEnergy,
107 G4double Z,
108 G4double A=0,
109 G4double cut=0,
110 G4double emax=DBL_MAX ) override;
111
112 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
113 const G4MaterialCutsCouple*,
114 const G4DynamicParticle*,
115 G4double tmin,
116 G4double maxEnergy) override;
117
118 G4LowEPPolarizedComptonModel & operator=(const G4LowEPPolarizedComptonModel &right) = delete;
119 G4LowEPPolarizedComptonModel(const G4LowEPPolarizedComptonModel&) = delete;
120
121 private:
122 void ReadData(size_t Z, const char* path = 0);
123
124 G4double ComputeScatteringFunction(G4double x, G4int Z);
125 G4ThreeVector GetRandomPolarization(G4ThreeVector& direction0); // Random Polarization
126 G4ThreeVector GetPerpendicularPolarization(const G4ThreeVector& direction0, const G4ThreeVector& polarization0) const;
127 G4ThreeVector SetNewPolarization(G4double LowEPPCepsilon, G4double sinT2,
128 G4double phi, G4double cosTheta);
129 G4double SetPhi(G4double, G4double);
130
131 void SystemOfRefChange(G4ThreeVector& direction0, G4ThreeVector& direction1,
132 G4ThreeVector& polarization0, G4ThreeVector& polarization1);
133
134 void SystemOfRefChangeElect(G4ThreeVector& pdirection, G4ThreeVector& edirection,
135 G4ThreeVector& ppolarization);
136
137 G4ThreeVector SetPerpendicularVector(G4ThreeVector& a);
138
139 G4ParticleChangeForGamma* fParticleChange;
140 G4VAtomDeexcitation* fAtomDeexcitation;
141
142 static G4ShellData* shellData;
143 static G4DopplerProfile* profileData;
144
145 static const G4int maxZ = 99;
146 static G4PhysicsFreeVector* data[100];
147 static const G4double ScatFuncFitParam[101][9];
148
149 G4int verboseLevel;
150 G4bool isInitialised;
151 };
152
153 //****************************************************************************
154
155 #endif
156