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Geant4/examples/advanced/eRosita/physics/src/G4RDGenerator2BS.cc

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Differences between /examples/advanced/eRosita/physics/src/G4RDGenerator2BS.cc (Version 11.3.0) and /examples/advanced/eRosita/physics/src/G4RDGenerator2BS.cc (Version 10.6.p3)


  1 //                                                  1 //
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 19 // * technical work of the GEANT4 collaboratio     19 // * technical work of the GEANT4 collaboration.                      *
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 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 //                                                 26 //
 27 // -------------------------------------------     27 // -------------------------------------------------------------------
 28 //                                                 28 //
 29 // GEANT4 Class file                               29 // GEANT4 Class file
 30 //                                                 30 //
 31 //                                                 31 //
 32 // File name:     G4RDGenerator2BS                 32 // File name:     G4RDGenerator2BS
 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: 2 June 2003                      38 // Creation date: 2 June 2003
 39 //                                                 39 //
 40 // Modifications:                                  40 // Modifications: 
 41 // 02 Jun 2003                    First implem     41 // 02 Jun 2003                    First implementation acording with new design
 42 // 05 Nov 2003  MGP               Fixed std na     42 // 05 Nov 2003  MGP               Fixed std namespace
 43 // 17 Nov 2003  MGP               Fixed compil     43 // 17 Nov 2003  MGP               Fixed compilation problem on Windows                  
 44 //                                                 44 //
 45 // Class Description:                              45 // Class Description: 
 46 //                                                 46 //
 47 // Concrete base class for Bremsstrahlung Angu     47 // Concrete base class for Bremsstrahlung Angular Distribution Generation - 2BS Distribution
 48 //                                                 48 //
 49 // Class Description: End                          49 // Class Description: End 
 50 //                                                 50 //
 51 // -------------------------------------------     51 // -------------------------------------------------------------------
 52 //                                                 52 //
 53 //                                                 53 //    
 54                                                    54 
 55 #include "G4RDGenerator2BS.hh"                     55 #include "G4RDGenerator2BS.hh"
 56 #include "Randomize.hh"                            56 #include "Randomize.hh"
 57 #include "G4PhysicalConstants.hh"                  57 #include "G4PhysicalConstants.hh"
 58 //                                                 58 //    
 59                                                    59 
 60 G4RDGenerator2BS::G4RDGenerator2BS(const G4Str     60 G4RDGenerator2BS::G4RDGenerator2BS(const G4String& name):G4RDVBremAngularDistribution(name)
 61 {;}                                                61 {;}
 62                                                    62 
 63 //                                                 63 //    
 64                                                    64 
 65 G4RDGenerator2BS::~G4RDGenerator2BS()              65 G4RDGenerator2BS::~G4RDGenerator2BS() 
 66 {;}                                                66 {;}
 67                                                    67 
 68 //                                                 68 //
 69                                                    69 
 70 G4double G4RDGenerator2BS::PolarAngle(const G4     70 G4double G4RDGenerator2BS::PolarAngle(const G4double initial_energy,
 71             const G4double final_energy,           71             const G4double final_energy,
 72             const G4int Z)                         72             const G4int Z)
 73 {                                                  73 {
 74                                                    74 
 75   // Adapted from "Improved bremsstrahlung pho     75   // Adapted from "Improved bremsstrahlung photon angular sampling in the EGS4 code system"
 76   // by Alex F. Bielajew, Rahde Mohan anc Chen     76   // by Alex F. Bielajew, Rahde Mohan anc Chen-Shou Chui, PIRS-0203
 77   // Ionizing Radiation Standards                  77   // Ionizing Radiation Standards
 78   // Institute for National Measurement Standa     78   // Institute for National Measurement Standards 
 79   // National Research Council of Canada           79   // National Research Council of Canada
 80   // Departement of Medical Physics, Memorial      80   // Departement of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York
 81                                                    81 
 82                                                    82 
 83   G4double theta = 0;                              83   G4double theta = 0;
 84                                                    84 
 85   G4double initialTotalEnergy = (initial_energ     85   G4double initialTotalEnergy = (initial_energy+electron_mass_c2)/electron_mass_c2;
 86   G4double finalTotalEnergy = (final_energy+el     86   G4double finalTotalEnergy = (final_energy+electron_mass_c2)/electron_mass_c2;
 87   EnergyRatio = finalTotalEnergy/initialTotalE     87   EnergyRatio = finalTotalEnergy/initialTotalEnergy;
 88   G4double gMaxEnergy = (pi*initialTotalEnergy     88   G4double gMaxEnergy = (pi*initialTotalEnergy)*(pi*initialTotalEnergy);
 89                                                    89 
 90   G4double Zeff = std::sqrt(static_cast<G4doub     90   G4double Zeff = std::sqrt(static_cast<G4double>(Z) * (static_cast<G4double>(Z) + 1.0));
 91   z = (0.00008116224*(std::pow(Zeff,0.3333333)     91   z = (0.00008116224*(std::pow(Zeff,0.3333333)));
 92                                                    92 
 93   // Rejection arguments                           93   // Rejection arguments
 94   rejection_argument1 = (1.0+EnergyRatio*Energ     94   rejection_argument1 = (1.0+EnergyRatio*EnergyRatio); 
 95   rejection_argument2 = - 2.0*EnergyRatio + 3.     95   rejection_argument2 = - 2.0*EnergyRatio + 3.0*rejection_argument1;
 96   rejection_argument3 = ((1-EnergyRatio)/(2.0*     96   rejection_argument3 = ((1-EnergyRatio)/(2.0*initialTotalEnergy*EnergyRatio))*
 97     ((1-EnergyRatio)/(2.0*initialTotalEnergy*E     97     ((1-EnergyRatio)/(2.0*initialTotalEnergy*EnergyRatio));
 98                                                    98 
 99   // Calculate rejection function at 0, 1 and      99   // Calculate rejection function at 0, 1 and Emax
100   G4double gfunction0 = RejectionFunction(0);     100   G4double gfunction0 = RejectionFunction(0);
101   G4double gfunction1 = RejectionFunction(1);     101   G4double gfunction1 = RejectionFunction(1);
102   G4double gfunctionEmax = RejectionFunction(g    102   G4double gfunctionEmax = RejectionFunction(gMaxEnergy);
103                                                   103 
104                                                   104 
105   // Calculate Maximum value                      105   // Calculate Maximum value 
106   G4double gMaximum = std::max(gfunction0,gfun    106   G4double gMaximum = std::max(gfunction0,gfunction1);
107   gMaximum = std::max(gMaximum,gfunctionEmax);    107   gMaximum = std::max(gMaximum,gfunctionEmax);
108                                                   108 
109   G4double rand, gfunctionTest, randTest;         109   G4double rand, gfunctionTest, randTest;
110                                                   110 
111   do{                                             111   do{
112     rand = G4UniformRand();                       112     rand = G4UniformRand();
113     rand = rand/(1-rand+1.0/gMaxEnergy);          113     rand = rand/(1-rand+1.0/gMaxEnergy);
114     gfunctionTest = RejectionFunction(rand);      114     gfunctionTest = RejectionFunction(rand);
115     randTest = G4UniformRand();                   115     randTest = G4UniformRand();
116                                                   116 
117   }while(randTest > (gfunctionTest/gMaximum));    117   }while(randTest > (gfunctionTest/gMaximum));
118                                                   118 
119   theta = std::sqrt(rand)/initialTotalEnergy;     119   theta = std::sqrt(rand)/initialTotalEnergy;
120                                                   120 
121                                                   121 
122   return theta;                                   122   return theta;
123 }                                                 123 }
124 //                                                124 //
125                                                   125 
126 G4double G4RDGenerator2BS::RejectionFunction(G    126 G4double G4RDGenerator2BS::RejectionFunction(G4double value) const
127 {                                                 127 {
128                                                   128 
129   G4double argument = (1+value)*(1+value);        129   G4double argument = (1+value)*(1+value);
130                                                   130 
131   G4double gfunction = (4+std::log(rejection_a    131   G4double gfunction = (4+std::log(rejection_argument3+(z/argument)))*
132     ((4*EnergyRatio*value/argument)-rejection_    132     ((4*EnergyRatio*value/argument)-rejection_argument1)+rejection_argument2;
133                                                   133 
134   return gfunction;                               134   return gfunction;
135                                                   135 
136 }                                                 136 }
137                                                   137 
138 void G4RDGenerator2BS::PrintGeneratorInformati    138 void G4RDGenerator2BS::PrintGeneratorInformation() const
139 {                                                 139 {
140   G4cout << "\n" << G4endl;                       140   G4cout << "\n" << G4endl;
141   G4cout << "Bremsstrahlung Angular Generator     141   G4cout << "Bremsstrahlung Angular Generator is 2BS Generator from 2BS Koch & Motz distribution (Rev Mod Phys 31(4), 920 (1959))" << G4endl;
142   G4cout << "Sampling algorithm adapted from P    142   G4cout << "Sampling algorithm adapted from PIRS-0203" << G4endl;
143   G4cout << "\n" << G4endl;                       143   G4cout << "\n" << G4endl;
144 }                                                 144 } 
145                                                   145 
146                                                   146