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Ur 75 // Universal distribution suggested by L. Urban (Geant3 manual (1993) 95 // Phys211) derived from Tsai distribution ( 76 // Phys211) derived from Tsai distribution (Rev Mod Phys 49,421(1977)) 96 77 97 G4double uMax = 2*(1. + kinEnergy/CLHEP::ele << 78 G4double uMax = 2*(1. + dp->GetKineticEnergy()/electron_mass_c2); 98 79 99 static const G4double a1 = 1.6; << 80 const G4double a1 = 0.625; 100 static const G4double a2 = a1/3.; << 81 const G4double a2 = 1.875; 101 static const G4double border = 0.25; << 82 const G4double border = 0.25; 102 G4double u; 83 G4double u; 103 CLHEP::HepRandomEngine* rndmEngine = G4Rando << 104 84 105 do { 85 do { 106 G4double uu = -G4Log(rndmEngine->flat()*rn << 86 u = - std::log(G4UniformRand()*G4UniformRand()); 107 u = (border > rndmEngine->flat()) ? uu*a1 << 87 >> 88 if ( border > G4UniformRand() ) { u /= a1; } >> 89 else { u /= a2; } 108 90 109 // Loop checking, 03-Aug-2015, Vladimir Iv << 110 } while(u > uMax); 91 } while(u > uMax); 111 92 112 return 1.0 - 2.0*u*u/(uMax*uMax); << 93 G4double cost = 1.0 - 2*u*u/(uMax*uMax); 113 } << 94 G4double sint = std::sqrt((1 - cost)*(1 + cost)); 114 << 95 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 96 134 cost = SampleCosTheta(posiKinEnergy); << 97 fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi), cost); 135 sint = std::sqrt((1. - cost)*(1. + cost)); << 98 fLocalDirection.rotateUz(dp->GetMomentumDirection()); 136 99 137 dirPositron.set(-sint*cosp, -sint*sinp, cost << 100 return fLocalDirection; 138 dirPositron.rotateUz(dp->GetMomentumDirectio << 139 } 101 } 140 102 141 //....oooOO0OOooo........oooOO0OOooo........oo << 142 << 143 void G4ModifiedTsai::PrintGeneratorInformation 103 void G4ModifiedTsai::PrintGeneratorInformation() const 144 { 104 { 145 G4cout << "\n" << G4endl; 105 G4cout << "\n" << G4endl; 146 G4cout << "Bremsstrahlung Angular Generator 106 G4cout << "Bremsstrahlung Angular Generator is Modified Tsai" << G4endl; 147 G4cout << "Distribution suggested by L.Urban 107 G4cout << "Distribution suggested by L.Urban (Geant3 manual (1993) Phys211)" 148 << G4endl; << 108 << G4endl; 149 G4cout << "Derived from Tsai distribution (R 109 G4cout << "Derived from Tsai distribution (Rev Mod Phys 49,421(1977)) \n" 150 << G4endl; << 110 << G4endl; 151 } 111 } 152 << 153 //....oooOO0OOooo........oooOO0OOooo........oo << 154 112