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Bielajew, Rahde Mohan anc Chen 85 // by Alex F. Bielajew, Rahde Mohan anc Chen-Shou Chui, PIRS-0203 81 // Ionizing Radiation Standards 86 // Ionizing Radiation Standards 82 // Institute for National Measurement Standa 87 // Institute for National Measurement Standards 83 // National Research Council of Canada 88 // National Research Council of Canada 84 // Departement of Medical Physics, Memorial 89 // Departement of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York 85 90 86 G4double energy = dp->GetTotalEnergy(); << 91 G4double theta = 0; 87 ratio = final_energy/energy; << 92 88 ratio1 = (1 + ratio)*(1 + ratio); << 93 G4double initialTotalEnergy = (initial_energy+electron_mass_c2)/electron_mass_c2; 89 ratio2 = 1 + ratio*ratio; << 94 G4double finalTotalEnergy = (final_energy+electron_mass_c2)/electron_mass_c2; >> 95 EnergyRatio = finalTotalEnergy/initialTotalEnergy; >> 96 G4double gMaxEnergy = (pi*initialTotalEnergy)*(pi*initialTotalEnergy); 90 97 91 G4double gamma = energy/electron_mass_c2; << 98 //G4double Zeff = std::sqrt(static_cast<G4double>(Z) * (static_cast<G4double>(Z) + 1.0)); 92 G4double beta = std::sqrt((gamma - 1)*(gamm << 99 //z = (0.00008116224*(std::pow(Zeff,0.3333333))); 93 100 94 // VI speadup 101 // VI speadup 95 fz = 0.00008116224*g4pow->Z13(Z)*g4pow->Z13( << 102 z = 0.00008116224*(g4pow->Z13(Z) + g4pow->Z13(Z+1)); 96 103 97 // majoranta << 104 // Rejection arguments 98 G4double ymax = 2*beta*(1 + beta)*gamma*gamm << 105 rejection_argument1 = (1.0+EnergyRatio*EnergyRatio); 99 G4double gMax = RejectionFunction(0.0); << 106 rejection_argument2 = - 2.0*EnergyRatio + 3.0*rejection_argument1; 100 gMax = std::max(gMax,RejectionFunction(ymax) << 107 rejection_argument3 = ((1-EnergyRatio)/(2.0*initialTotalEnergy*EnergyRatio))* >> 108 ((1-EnergyRatio)/(2.0*initialTotalEnergy*EnergyRatio)); >> 109 >> 110 // Calculate rejection function at 0, 1 and Emax >> 111 G4double gfunction0 = RejectionFunction(0.0); >> 112 G4double gfunction1 = RejectionFunction(1.0); >> 113 G4double gfunctionEmax = RejectionFunction(gMaxEnergy); >> 114 >> 115 // Calculate Maximum value >> 116 G4double gMaximum = std::max(gfunction0,gfunction1); >> 117 gMaximum = std::max(gMaximum,gfunctionEmax); 101 118 102 G4double y, gfun; << 119 G4double rand, gfunctionTest, randTest; 103 120 104 do{ 121 do{ 105 G4double q = G4UniformRand(); << 122 rand = G4UniformRand(); 106 y = q*ymax/(1 + ymax*(1 - q)); << 123 rand /= (1 - rand + 1.0/gMaxEnergy); 107 gfun = RejectionFunction(y); << 124 gfunctionTest = RejectionFunction(rand); 108 << 125 randTest = G4UniformRand(); 109 // violation point << 126 110 if(gfun > gMax && nwarn >= 20) { << 127 } while(randTest*gMaximum > gfunctionTest); 111 ++nwarn; << 112 G4cout << "### WARNING in G4Generator2BS << 113 << " Egamma(MeV)" << (energy - final_e << 114 << " gMax= " << gMax << " < " << gfun << 115 << " results are not reliable!" << 116 << G4endl; << 117 if(20 == nwarn) { << 118 G4cout << " WARNING in G4Generator2BS is c << 119 } << 120 } << 121 << 122 } while(G4UniformRand()*gMax > gfun || y > y << 123 << 124 G4double cost = 1 - 2*y/ymax; << 125 G4double sint = std::sqrt((1 - cost)*(1 + co << 126 G4double phi = twopi*G4UniformRand(); << 127 128 128 fLocalDirection.set(sint*std::cos(phi), sint << 129 theta = std::sqrt(rand)/initialTotalEnergy; 129 fLocalDirection.rotateUz(dp->GetMomentumDire << 130 130 131 return fLocalDirection; << 131 return theta; 132 } 132 } >> 133 >> 134 // 133 135 134 void G4Generator2BS::PrintGeneratorInformation 136 void G4Generator2BS::PrintGeneratorInformation() const 135 { 137 { 136 G4cout << "\n" << G4endl; 138 G4cout << "\n" << G4endl; 137 G4cout << "Bremsstrahlung Angular Generator 139 G4cout << "Bremsstrahlung Angular Generator is 2BS Generator " 138 << "from 2BS Koch & Motz distribution (Rev 140 << "from 2BS Koch & Motz distribution (Rev Mod Phys 31(4), 920 (1959))" << G4endl; 139 G4cout << "Sampling algorithm adapted from P 141 G4cout << "Sampling algorithm adapted from PIRS-0203" << G4endl; 140 G4cout << "\n" << G4endl; 142 G4cout << "\n" << G4endl; 141 } 143 } 142 144 143 145