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Bielajew, Rahde Mohan anc Chen 75 // by Alex F. Bielajew, Rahde Mohan anc Chen-Shou Chui, PIRS-0203 81 // Ionizing Radiation Standards 76 // Ionizing Radiation Standards 82 // Institute for National Measurement Standa 77 // Institute for National Measurement Standards 83 // National Research Council of Canada 78 // National Research Council of Canada 84 // Departement of Medical Physics, Memorial 79 // Departement of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York 85 80 86 G4double energy = dp->GetTotalEnergy(); << 87 ratio = final_energy/energy; << 88 ratio1 = (1 + ratio)*(1 + ratio); << 89 ratio2 = 1 + ratio*ratio; << 90 << 91 G4double gamma = energy/electron_mass_c2; << 92 G4double beta = std::sqrt((gamma - 1)*(gamm << 93 << 94 // VI speadup << 95 fz = 0.00008116224*g4pow->Z13(Z)*g4pow->Z13( << 96 << 97 // majoranta << 98 G4double ymax = 2*beta*(1 + beta)*gamma*gamm << 99 G4double gMax = RejectionFunction(0.0); << 100 gMax = std::max(gMax,RejectionFunction(ymax) << 101 81 102 G4double y, gfun; << 82 G4double theta = 0; >> 83 >> 84 G4double initialTotalEnergy = (initial_energy+electron_mass_c2)/electron_mass_c2; >> 85 G4double finalTotalEnergy = (final_energy+electron_mass_c2)/electron_mass_c2; >> 86 EnergyRatio = finalTotalEnergy/initialTotalEnergy; >> 87 G4double gMaxEnergy = (pi*initialTotalEnergy)*(pi*initialTotalEnergy); >> 88 >> 89 G4double Zeff = std::sqrt(static_cast<G4double>(Z) * (static_cast<G4double>(Z) + 1.0)); >> 90 z = (0.00008116224*(std::pow(Zeff,0.3333333))); >> 91 >> 92 // Rejection arguments >> 93 rejection_argument1 = (1.0+EnergyRatio*EnergyRatio); >> 94 rejection_argument2 = - 2.0*EnergyRatio + 3.0*rejection_argument1; >> 95 rejection_argument3 = ((1-EnergyRatio)/(2.0*initialTotalEnergy*EnergyRatio))* >> 96 ((1-EnergyRatio)/(2.0*initialTotalEnergy*EnergyRatio)); >> 97 >> 98 // Calculate rejection function at 0, 1 and Emax >> 99 G4double gfunction0 = RejectionFunction(0); >> 100 G4double gfunction1 = RejectionFunction(1); >> 101 G4double gfunctionEmax = RejectionFunction(gMaxEnergy); >> 102 >> 103 >> 104 // Calculate Maximum value >> 105 G4double gMaximum = std::max(gfunction0,gfunction1); >> 106 gMaximum = std::max(gMaximum,gfunctionEmax); >> 107 >> 108 G4double rand, gfunctionTest, randTest; 103 109 104 do{ 110 do{ 105 G4double q = G4UniformRand(); << 111 rand = G4UniformRand(); 106 y = q*ymax/(1 + ymax*(1 - q)); << 112 rand = rand/(1-rand+1.0/gMaxEnergy); 107 gfun = RejectionFunction(y); << 113 gfunctionTest = RejectionFunction(rand); 108 << 114 randTest = G4UniformRand(); 109 // violation point << 115 110 if(gfun > gMax && nwarn >= 20) { << 116 }while(randTest > (gfunctionTest/gMaximum)); 111 ++nwarn; << 117 112 G4cout << "### WARNING in G4Generator2BS << 118 theta = std::sqrt(rand)/initialTotalEnergy; 113 << " Egamma(MeV)" << (energy - final_e << 119 114 << " gMax= " << gMax << " < " << gfun << 120 115 << " results are not reliable!" << 121 return theta; 116 << G4endl; << 122 } 117 if(20 == nwarn) { << 123 // 118 G4cout << " WARNING in G4Generator2BS is c << 124 119 } << 125 G4double G4Generator2BS::RejectionFunction(G4double value) const 120 } << 126 { 121 << 127 122 } while(G4UniformRand()*gMax > gfun || y > y << 128 G4double argument = (1+value)*(1+value); 123 << 129 124 G4double cost = 1 - 2*y/ymax; << 130 G4double gfunction = (4+std::log(rejection_argument3+(z/argument)))* 125 G4double sint = std::sqrt((1 - cost)*(1 + co << 131 ((4*EnergyRatio*value/argument)-rejection_argument1)+rejection_argument2; 126 G4double phi = twopi*G4UniformRand(); << 127 132 128 fLocalDirection.set(sint*std::cos(phi), sint << 133 return gfunction; 129 fLocalDirection.rotateUz(dp->GetMomentumDire << 130 134 131 return fLocalDirection; << 132 } 135 } 133 136 134 void G4Generator2BS::PrintGeneratorInformation 137 void G4Generator2BS::PrintGeneratorInformation() const 135 { 138 { 136 G4cout << "\n" << G4endl; 139 G4cout << "\n" << G4endl; 137 G4cout << "Bremsstrahlung Angular Generator << 140 G4cout << "Bremsstrahlung Angular Generator is 2BS Generator from 2BS Koch & Motz distribution (Rev Mod Phys 31(4), 920 (1959))" << G4endl; 138 << "from 2BS Koch & Motz distribution (Rev << 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