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>> 26 // $Id: G4ModifiedTsai.cc 74581 2013-10-15 12:03:25Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4ModifiedTsai 33 // File name: G4ModifiedTsai
33 // 34 //
34 // Author: Andreia Trindade (andreia@li 35 // Author: Andreia Trindade (andreia@lip.pt)
35 // Pedro Rodrigues (psilva@lip 36 // Pedro Rodrigues (psilva@lip.pt)
36 // Luis Peralta (luis@lip.p 37 // Luis Peralta (luis@lip.pt)
37 // 38 //
38 // Creation date: 21 March 2003 39 // Creation date: 21 March 2003
39 // 40 //
40 // Modifications: 41 // Modifications:
41 // 21 Mar 2003 A.Trindade First implementation 42 // 21 Mar 2003 A.Trindade First implementation acording with new design
42 // 24 Mar 2003 A.Trindade Fix in Tsai generato 43 // 24 Mar 2003 A.Trindade Fix in Tsai generator in order to prevent theta
43 // generation above pi 44 // generation above pi
44 // 13 Oct 2010 V.Ivanchenko Moved to standar 45 // 13 Oct 2010 V.Ivanchenko Moved to standard and improved comment
45 // 26.04.2011 V.Grichine Clean-up of Pola 46 // 26.04.2011 V.Grichine Clean-up of PolarAngle method
46 // 47 //
47 // Class Description: 48 // Class Description:
48 // 49 //
49 // Bremsstrahlung Angular Distribution Generat 50 // Bremsstrahlung Angular Distribution Generation
50 // suggested by L.Urban (Geant3 manual (1993) 51 // suggested by L.Urban (Geant3 manual (1993) Phys211)
51 // Derived from Tsai distribution (Rev Mod Phy 52 // Derived from Tsai distribution (Rev Mod Phys 49,421(1977))
52 // 53 //
53 // Class Description: End 54 // Class Description: End
54 // 55 //
55 // ------------------------------------------- 56 // -------------------------------------------------------------------
56 // 57 //
57 58
58 #include "G4ModifiedTsai.hh" 59 #include "G4ModifiedTsai.hh"
>> 60 #include "G4PhysicalConstants.hh"
59 #include "Randomize.hh" 61 #include "Randomize.hh"
60 #include "G4Log.hh" 62 #include "G4Log.hh"
61 #include <CLHEP/Units/PhysicalConstants.h> <<
62 <<
63 //....oooOO0OOooo........oooOO0OOooo........oo <<
64 63
65 G4ModifiedTsai::G4ModifiedTsai(const G4String& 64 G4ModifiedTsai::G4ModifiedTsai(const G4String&)
66 : G4VEmAngularDistribution("ModifiedTsai") << 65 : G4VEmAngularDistribution("AngularGenUrban")
67 {} 66 {}
68 67
69 //....oooOO0OOooo........oooOO0OOooo........oo << 68 G4ModifiedTsai::~G4ModifiedTsai()
70 << 69 {}
71 G4ModifiedTsai::~G4ModifiedTsai() = default; <<
72 <<
73 //....oooOO0OOooo........oooOO0OOooo........oo <<
74 70
75 G4ThreeVector& 71 G4ThreeVector&
76 G4ModifiedTsai::SampleDirection(const G4Dynami 72 G4ModifiedTsai::SampleDirection(const G4DynamicParticle* dp,
77 G4double, G4in << 73 G4double, G4int, const G4Material*)
78 { 74 {
79 // Sample gamma angle (Z - axis along the pa 75 // Sample gamma angle (Z - axis along the parent particle).
80 G4double cost = SampleCosTheta(dp->GetKineti <<
81 G4double sint = std::sqrt((1 - cost)*(1 + co <<
82 G4double phi = CLHEP::twopi*G4UniformRand() <<
83 <<
84 fLocalDirection.set(sint*std::cos(phi), sint <<
85 fLocalDirection.rotateUz(dp->GetMomentumDire <<
86 <<
87 return fLocalDirection; <<
88 } <<
89 <<
90 //....oooOO0OOooo........oooOO0OOooo........oo <<
91 <<
92 G4double G4ModifiedTsai::SampleCosTheta(G4doub <<
93 { <<
94 // Universal distribution suggested by L. Ur 76 // Universal distribution suggested by L. Urban (Geant3 manual (1993)
95 // Phys211) derived from Tsai distribution ( 77 // Phys211) derived from Tsai distribution (Rev Mod Phys 49,421(1977))
96 78
97 G4double uMax = 2*(1. + kinEnergy/CLHEP::ele << 79 G4double uMax = 2*(1. + dp->GetKineticEnergy()/electron_mass_c2);
98 80
99 static const G4double a1 = 1.6; << 81 static const G4double a1 = 0.625;
100 static const G4double a2 = a1/3.; << 82 static const G4double a2 = 1.875;
101 static const G4double border = 0.25; 83 static const G4double border = 0.25;
102 G4double u; 84 G4double u;
103 CLHEP::HepRandomEngine* rndmEngine = G4Rando <<
104 85
105 do { 86 do {
106 G4double uu = -G4Log(rndmEngine->flat()*rn << 87 u = - G4Log(G4UniformRand()*G4UniformRand());
107 u = (border > rndmEngine->flat()) ? uu*a1 << 88
>> 89 if ( border > G4UniformRand() ) { u /= a1; }
>> 90 else { u /= a2; }
108 91
109 // Loop checking, 03-Aug-2015, Vladimir Iv <<
110 } while(u > uMax); 92 } while(u > uMax);
111 93
112 return 1.0 - 2.0*u*u/(uMax*uMax); << 94 G4double cost = 1.0 - 2*u*u/(uMax*uMax);
113 } << 95 G4double sint = std::sqrt((1 - cost)*(1 + cost));
114 << 96 G4double phi = CLHEP::twopi*G4UniformRand();
115 //....oooOO0OOooo........oooOO0OOooo........oo <<
116 <<
117 void G4ModifiedTsai::SamplePairDirections(cons <<
118 G4double elecKinEnergy, <<
119 G4double posiKinEnergy, <<
120 G4ThreeVector& dirElectron, <<
121 G4ThreeVector& dirPositron, <<
122 G4int, const G4Material*) <<
123 { <<
124 G4double phi = CLHEP::twopi * G4UniformRand <<
125 G4double sinp = std::sin(phi); <<
126 G4double cosp = std::cos(phi); <<
127 <<
128 G4double cost = SampleCosTheta(elecKinEnergy <<
129 G4double sint = std::sqrt((1. - cost)*(1. + <<
130 <<
131 dirElectron.set(sint*cosp, sint*sinp, cost); <<
132 dirElectron.rotateUz(dp->GetMomentumDirectio <<
133 97
134 cost = SampleCosTheta(posiKinEnergy); << 98 fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi), cost);
135 sint = std::sqrt((1. - cost)*(1. + cost)); << 99 fLocalDirection.rotateUz(dp->GetMomentumDirection());
136 100
137 dirPositron.set(-sint*cosp, -sint*sinp, cost << 101 return fLocalDirection;
138 dirPositron.rotateUz(dp->GetMomentumDirectio <<
139 } 102 }
140 103
141 //....oooOO0OOooo........oooOO0OOooo........oo <<
142 <<
143 void G4ModifiedTsai::PrintGeneratorInformation 104 void G4ModifiedTsai::PrintGeneratorInformation() const
144 { 105 {
145 G4cout << "\n" << G4endl; 106 G4cout << "\n" << G4endl;
146 G4cout << "Bremsstrahlung Angular Generator 107 G4cout << "Bremsstrahlung Angular Generator is Modified Tsai" << G4endl;
147 G4cout << "Distribution suggested by L.Urban 108 G4cout << "Distribution suggested by L.Urban (Geant3 manual (1993) Phys211)"
148 << G4endl; << 109 << G4endl;
149 G4cout << "Derived from Tsai distribution (R 110 G4cout << "Derived from Tsai distribution (Rev Mod Phys 49,421(1977)) \n"
150 << G4endl; << 111 << G4endl;
151 } 112 }
152 <<
153 //....oooOO0OOooo........oooOO0OOooo........oo <<
154 113