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26 // 26 //
27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class file 29 // GEANT4 Class file
30 // 30 //
31 // 31 //
32 // File name: G4Generator2BS 32 // File name: G4Generator2BS
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 implementat 41 // 02 Jun 2003 First implementation acording with new design
42 // 05 Nov 2003 MGP Fixed std namespa 42 // 05 Nov 2003 MGP Fixed std namespace
43 // 17 Nov 2003 MGP Fixed compilation 43 // 17 Nov 2003 MGP Fixed compilation problem on Windows
44 // 12 Oct 2010 V.Ivanchenko Moved RejectionFu 44 // 12 Oct 2010 V.Ivanchenko Moved RejectionFunction inline, use G4Pow to speadup
45 // 09 May 2011 L.Pandola Initialize privat 45 // 09 May 2011 L.Pandola Initialize private members, to avoid Coverity warning
46 // 46 //
47 // Class Description: 47 // Class Description:
48 // 48 //
49 // Concrete base class for Bremsstrahlung Angu 49 // Concrete base class for Bremsstrahlung Angular Distribution Generation
50 // 2BS Distribution 50 // 2BS Distribution
51 // 51 //
52 // Class Description: End 52 // Class Description: End
53 // 53 //
54 // ------------------------------------------- 54 // -------------------------------------------------------------------
55 // 55 //
56 56
57 #include "G4Generator2BS.hh" 57 #include "G4Generator2BS.hh"
58 #include "Randomize.hh" 58 #include "Randomize.hh"
59 #include "G4PhysicalConstants.hh" 59 #include "G4PhysicalConstants.hh"
60 #include "G4SystemOfUnits.hh" 60 #include "G4SystemOfUnits.hh"
61 #include "G4Pow.hh" 61 #include "G4Pow.hh"
62 62
63 G4Generator2BS::G4Generator2BS(const G4String& 63 G4Generator2BS::G4Generator2BS(const G4String&)
64 : G4VEmAngularDistribution("AngularGen2BS"), 64 : G4VEmAngularDistribution("AngularGen2BS"),fz(1.),ratio(1.),
65 ratio1(1.),ratio2(1.),delta(0.) 65 ratio1(1.),ratio2(1.),delta(0.)
66 { 66 {
67 g4pow = G4Pow::GetInstance(); 67 g4pow = G4Pow::GetInstance();
68 nwarn = 0; 68 nwarn = 0;
69 } 69 }
70 70
71 G4Generator2BS::~G4Generator2BS() 71 G4Generator2BS::~G4Generator2BS()
72 {} 72 {}
73 73
74 G4ThreeVector& G4Generator2BS::SampleDirection 74 G4ThreeVector& G4Generator2BS::SampleDirection(const G4DynamicParticle* dp,
75 G4double final_energy, 75 G4double final_energy,
76 G4int Z, 76 G4int Z,
77 const G4Material*) 77 const G4Material*)
78 { 78 {
79 // Adapted from "Improved bremsstrahlung pho 79 // Adapted from "Improved bremsstrahlung photon angular sampling in the EGS4 code system"
80 // by Alex F. Bielajew, Rahde Mohan anc Chen 80 // by Alex F. Bielajew, Rahde Mohan anc Chen-Shou Chui, PIRS-0203
81 // Ionizing Radiation Standards 81 // Ionizing Radiation Standards
82 // Institute for National Measurement Standa 82 // Institute for National Measurement Standards
83 // National Research Council of Canada 83 // National Research Council of Canada
84 // Departement of Medical Physics, Memorial 84 // Departement of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York
85 85
86 G4double energy = dp->GetTotalEnergy(); 86 G4double energy = dp->GetTotalEnergy();
87 ratio = final_energy/energy; 87 ratio = final_energy/energy;
88 ratio1 = (1 + ratio)*(1 + ratio); 88 ratio1 = (1 + ratio)*(1 + ratio);
89 ratio2 = 1 + ratio*ratio; 89 ratio2 = 1 + ratio*ratio;
90 90
91 G4double gamma = energy/electron_mass_c2; 91 G4double gamma = energy/electron_mass_c2;
92 G4double beta = std::sqrt((gamma - 1)*(gamm 92 G4double beta = std::sqrt((gamma - 1)*(gamma + 1))/gamma;
93 93
94 // VI speadup 94 // VI speadup
95 fz = 0.00008116224*g4pow->Z13(Z)*g4pow->Z13( 95 fz = 0.00008116224*g4pow->Z13(Z)*g4pow->Z13(Z+1);
96 96
97 // majoranta 97 // majoranta
98 G4double ymax = 2*beta*(1 + beta)*gamma*gamm 98 G4double ymax = 2*beta*(1 + beta)*gamma*gamma;
99 G4double gMax = RejectionFunction(0.0); 99 G4double gMax = RejectionFunction(0.0);
100 gMax = std::max(gMax,RejectionFunction(ymax) 100 gMax = std::max(gMax,RejectionFunction(ymax));
101 101
102 G4double y, gfun; 102 G4double y, gfun;
103 103
104 do{ 104 do{
105 G4double q = G4UniformRand(); 105 G4double q = G4UniformRand();
106 y = q*ymax/(1 + ymax*(1 - q)); 106 y = q*ymax/(1 + ymax*(1 - q));
107 gfun = RejectionFunction(y); 107 gfun = RejectionFunction(y);
108 108
109 // violation point 109 // violation point
110 if(gfun > gMax && nwarn >= 20) { 110 if(gfun > gMax && nwarn >= 20) {
111 ++nwarn; 111 ++nwarn;
112 G4cout << "### WARNING in G4Generator2BS 112 G4cout << "### WARNING in G4Generator2BS: Etot(MeV)= " << energy/MeV
113 << " Egamma(MeV)" << (energy - final_e 113 << " Egamma(MeV)" << (energy - final_energy)/MeV
114 << " gMax= " << gMax << " < " << gfun 114 << " gMax= " << gMax << " < " << gfun
115 << " results are not reliable!" 115 << " results are not reliable!"
116 << G4endl; 116 << G4endl;
117 if(20 == nwarn) { 117 if(20 == nwarn) {
118 G4cout << " WARNING in G4Generator2BS is c 118 G4cout << " WARNING in G4Generator2BS is closed" << G4endl;
119 } 119 }
120 } 120 }
121 121
122 } while(G4UniformRand()*gMax > gfun || y > y 122 } while(G4UniformRand()*gMax > gfun || y > ymax);
123 123
124 G4double cost = 1 - 2*y/ymax; 124 G4double cost = 1 - 2*y/ymax;
125 G4double sint = std::sqrt((1 - cost)*(1 + co 125 G4double sint = std::sqrt((1 - cost)*(1 + cost));
126 G4double phi = twopi*G4UniformRand(); 126 G4double phi = twopi*G4UniformRand();
127 127
128 fLocalDirection.set(sint*std::cos(phi), sint 128 fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi),cost);
129 fLocalDirection.rotateUz(dp->GetMomentumDire 129 fLocalDirection.rotateUz(dp->GetMomentumDirection());
130 130
131 return fLocalDirection; 131 return fLocalDirection;
132 } 132 }
133 133
134 void G4Generator2BS::PrintGeneratorInformation 134 void G4Generator2BS::PrintGeneratorInformation() const
135 { 135 {
136 G4cout << "\n" << G4endl; 136 G4cout << "\n" << G4endl;
137 G4cout << "Bremsstrahlung Angular Generator 137 G4cout << "Bremsstrahlung Angular Generator is 2BS Generator "
138 << "from 2BS Koch & Motz distribution (Rev 138 << "from 2BS Koch & Motz distribution (Rev Mod Phys 31(4), 920 (1959))" << G4endl;
139 G4cout << "Sampling algorithm adapted from P 139 G4cout << "Sampling algorithm adapted from PIRS-0203" << G4endl;
140 G4cout << "\n" << G4endl; 140 G4cout << "\n" << G4endl;
141 } 141 }
142 142
143 143