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27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class file 29 // GEANT4 Class file
30 // 30 //
31 // 31 //
32 // File name: G4ModifiedTsai 32 // File name: G4ModifiedTsai
33 // 33 //
34 // Author: Andreia Trindade (andreia@li 34 // Author: Andreia Trindade (andreia@lip.pt)
35 // Pedro Rodrigues (psilva@lip 35 // Pedro Rodrigues (psilva@lip.pt)
36 // Luis Peralta (luis@lip.p 36 // Luis Peralta (luis@lip.pt)
37 // 37 //
38 // Creation date: 21 March 2003 38 // Creation date: 21 March 2003
39 // 39 //
40 // Modifications: 40 // Modifications:
41 // 21 Mar 2003 A.Trindade First implementation 41 // 21 Mar 2003 A.Trindade First implementation acording with new design
42 // 24 Mar 2003 A.Trindade Fix in Tsai generato 42 // 24 Mar 2003 A.Trindade Fix in Tsai generator in order to prevent theta
43 // generation above pi 43 // generation above pi
44 // 13 Oct 2010 V.Ivanchenko Moved to standar 44 // 13 Oct 2010 V.Ivanchenko Moved to standard and improved comment
45 // 26.04.2011 V.Grichine Clean-up of Pola 45 // 26.04.2011 V.Grichine Clean-up of PolarAngle method
46 // 46 //
47 // Class Description: 47 // Class Description:
48 // 48 //
49 // Bremsstrahlung Angular Distribution Generat 49 // Bremsstrahlung Angular Distribution Generation
50 // suggested by L.Urban (Geant3 manual (1993) 50 // suggested by L.Urban (Geant3 manual (1993) Phys211)
51 // Derived from Tsai distribution (Rev Mod Phy 51 // Derived from Tsai distribution (Rev Mod Phys 49,421(1977))
52 // 52 //
53 // Class Description: End 53 // Class Description: End
54 // 54 //
55 // ------------------------------------------- 55 // -------------------------------------------------------------------
56 // 56 //
57 57
58 #include "G4ModifiedTsai.hh" 58 #include "G4ModifiedTsai.hh"
59 #include "Randomize.hh" 59 #include "Randomize.hh"
60 #include "G4Log.hh" 60 #include "G4Log.hh"
61 #include <CLHEP/Units/PhysicalConstants.h> 61 #include <CLHEP/Units/PhysicalConstants.h>
62 62
63 //....oooOO0OOooo........oooOO0OOooo........oo 63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64 64
65 G4ModifiedTsai::G4ModifiedTsai(const G4String& 65 G4ModifiedTsai::G4ModifiedTsai(const G4String&)
66 : G4VEmAngularDistribution("ModifiedTsai") 66 : G4VEmAngularDistribution("ModifiedTsai")
67 {} 67 {}
68 68
69 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
70 70
71 G4ModifiedTsai::~G4ModifiedTsai() = default; << 71 G4ModifiedTsai::~G4ModifiedTsai()
>> 72 {}
72 73
73 //....oooOO0OOooo........oooOO0OOooo........oo 74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
74 75
75 G4ThreeVector& 76 G4ThreeVector&
76 G4ModifiedTsai::SampleDirection(const G4Dynami 77 G4ModifiedTsai::SampleDirection(const G4DynamicParticle* dp,
77 G4double, G4in 78 G4double, G4int, const G4Material*)
78 { 79 {
79 // Sample gamma angle (Z - axis along the pa 80 // Sample gamma angle (Z - axis along the parent particle).
80 G4double cost = SampleCosTheta(dp->GetKineti 81 G4double cost = SampleCosTheta(dp->GetKineticEnergy());
81 G4double sint = std::sqrt((1 - cost)*(1 + co 82 G4double sint = std::sqrt((1 - cost)*(1 + cost));
82 G4double phi = CLHEP::twopi*G4UniformRand() 83 G4double phi = CLHEP::twopi*G4UniformRand();
83 84
84 fLocalDirection.set(sint*std::cos(phi), sint 85 fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi), cost);
85 fLocalDirection.rotateUz(dp->GetMomentumDire 86 fLocalDirection.rotateUz(dp->GetMomentumDirection());
86 87
87 return fLocalDirection; 88 return fLocalDirection;
88 } 89 }
89 90
90 //....oooOO0OOooo........oooOO0OOooo........oo 91 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
91 92
92 G4double G4ModifiedTsai::SampleCosTheta(G4doub 93 G4double G4ModifiedTsai::SampleCosTheta(G4double kinEnergy)
93 { 94 {
94 // Universal distribution suggested by L. Ur 95 // Universal distribution suggested by L. Urban (Geant3 manual (1993)
95 // Phys211) derived from Tsai distribution ( 96 // Phys211) derived from Tsai distribution (Rev Mod Phys 49,421(1977))
96 97
97 G4double uMax = 2*(1. + kinEnergy/CLHEP::ele 98 G4double uMax = 2*(1. + kinEnergy/CLHEP::electron_mass_c2);
98 99
99 static const G4double a1 = 1.6; 100 static const G4double a1 = 1.6;
100 static const G4double a2 = a1/3.; 101 static const G4double a2 = a1/3.;
101 static const G4double border = 0.25; 102 static const G4double border = 0.25;
102 G4double u; 103 G4double u;
103 CLHEP::HepRandomEngine* rndmEngine = G4Rando 104 CLHEP::HepRandomEngine* rndmEngine = G4Random::getTheEngine();
104 105
105 do { 106 do {
106 G4double uu = -G4Log(rndmEngine->flat()*rn 107 G4double uu = -G4Log(rndmEngine->flat()*rndmEngine->flat());
107 u = (border > rndmEngine->flat()) ? uu*a1 108 u = (border > rndmEngine->flat()) ? uu*a1 : uu*a2;
108 109
109 // Loop checking, 03-Aug-2015, Vladimir Iv 110 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
110 } while(u > uMax); 111 } while(u > uMax);
111 112
112 return 1.0 - 2.0*u*u/(uMax*uMax); 113 return 1.0 - 2.0*u*u/(uMax*uMax);
113 } 114 }
114 115
115 //....oooOO0OOooo........oooOO0OOooo........oo 116 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
116 117
117 void G4ModifiedTsai::SamplePairDirections(cons 118 void G4ModifiedTsai::SamplePairDirections(const G4DynamicParticle* dp,
118 G4double elecKinEnergy, 119 G4double elecKinEnergy,
119 G4double posiKinEnergy, 120 G4double posiKinEnergy,
120 G4ThreeVector& dirElectron, 121 G4ThreeVector& dirElectron,
121 G4ThreeVector& dirPositron, 122 G4ThreeVector& dirPositron,
122 G4int, const G4Material*) 123 G4int, const G4Material*)
123 { 124 {
124 G4double phi = CLHEP::twopi * G4UniformRand 125 G4double phi = CLHEP::twopi * G4UniformRand();
125 G4double sinp = std::sin(phi); 126 G4double sinp = std::sin(phi);
126 G4double cosp = std::cos(phi); 127 G4double cosp = std::cos(phi);
127 128
128 G4double cost = SampleCosTheta(elecKinEnergy 129 G4double cost = SampleCosTheta(elecKinEnergy);
129 G4double sint = std::sqrt((1. - cost)*(1. + 130 G4double sint = std::sqrt((1. - cost)*(1. + cost));
130 131
131 dirElectron.set(sint*cosp, sint*sinp, cost); 132 dirElectron.set(sint*cosp, sint*sinp, cost);
132 dirElectron.rotateUz(dp->GetMomentumDirectio 133 dirElectron.rotateUz(dp->GetMomentumDirection());
133 134
134 cost = SampleCosTheta(posiKinEnergy); 135 cost = SampleCosTheta(posiKinEnergy);
135 sint = std::sqrt((1. - cost)*(1. + cost)); 136 sint = std::sqrt((1. - cost)*(1. + cost));
136 137
137 dirPositron.set(-sint*cosp, -sint*sinp, cost 138 dirPositron.set(-sint*cosp, -sint*sinp, cost);
138 dirPositron.rotateUz(dp->GetMomentumDirectio 139 dirPositron.rotateUz(dp->GetMomentumDirection());
139 } 140 }
140 141
141 //....oooOO0OOooo........oooOO0OOooo........oo 142 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
142 143
143 void G4ModifiedTsai::PrintGeneratorInformation 144 void G4ModifiedTsai::PrintGeneratorInformation() const
144 { 145 {
145 G4cout << "\n" << G4endl; 146 G4cout << "\n" << G4endl;
146 G4cout << "Bremsstrahlung Angular Generator 147 G4cout << "Bremsstrahlung Angular Generator is Modified Tsai" << G4endl;
147 G4cout << "Distribution suggested by L.Urban 148 G4cout << "Distribution suggested by L.Urban (Geant3 manual (1993) Phys211)"
148 << G4endl; 149 << G4endl;
149 G4cout << "Derived from Tsai distribution (R 150 G4cout << "Derived from Tsai distribution (Rev Mod Phys 49,421(1977)) \n"
150 << G4endl; 151 << G4endl;
151 } 152 }
152 153
153 //....oooOO0OOooo........oooOO0OOooo........oo 154 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
154 155