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>> 26 // $Id: G4Generator2BS.cc 66241 2012-12-13 18:34:42Z gunter $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4Generator2BS 33 // File name: G4Generator2BS
33 // 34 //
34 // Author: Andreia Trindade (andreia@li 35 // Author: Andreia Trindade (andreia@lip.pt)
35 // Pedro Rodrigues (psilva@lip 36 // Pedro Rodrigues (psilva@lip.pt)
36 // Luis Peralta (luis@lip.p 37 // Luis Peralta (luis@lip.pt)
37 // 38 //
38 // Creation date: 2 June 2003 39 // Creation date: 2 June 2003
39 // 40 //
40 // Modifications: 41 // Modifications:
41 // 02 Jun 2003 First implementat 42 // 02 Jun 2003 First implementation acording with new design
42 // 05 Nov 2003 MGP Fixed std namespa 43 // 05 Nov 2003 MGP Fixed std namespace
43 // 17 Nov 2003 MGP Fixed compilation 44 // 17 Nov 2003 MGP Fixed compilation problem on Windows
44 // 12 Oct 2010 V.Ivanchenko Moved RejectionFu 45 // 12 Oct 2010 V.Ivanchenko Moved RejectionFunction inline, use G4Pow to speadup
45 // 09 May 2011 L.Pandola Initialize privat 46 // 09 May 2011 L.Pandola Initialize private members, to avoid Coverity warning
46 // 47 //
47 // Class Description: 48 // Class Description:
48 // 49 //
49 // Concrete base class for Bremsstrahlung Angu 50 // Concrete base class for Bremsstrahlung Angular Distribution Generation
50 // 2BS Distribution 51 // 2BS Distribution
51 // 52 //
52 // Class Description: End 53 // Class Description: End
53 // 54 //
54 // ------------------------------------------- 55 // -------------------------------------------------------------------
55 // 56 //
56 57
57 #include "G4Generator2BS.hh" 58 #include "G4Generator2BS.hh"
58 #include "Randomize.hh" 59 #include "Randomize.hh"
59 #include "G4PhysicalConstants.hh" 60 #include "G4PhysicalConstants.hh"
60 #include "G4SystemOfUnits.hh" 61 #include "G4SystemOfUnits.hh"
61 #include "G4Pow.hh" 62 #include "G4Pow.hh"
62 63
63 G4Generator2BS::G4Generator2BS(const G4String& 64 G4Generator2BS::G4Generator2BS(const G4String&)
64 : G4VEmAngularDistribution("AngularGen2BS"), << 65 : G4VEmAngularDistribution("AngularGen2BS"),fz(1),ratio(1),
65 ratio1(1.),ratio2(1.),delta(0.) << 66 ratio1(1),ratio2(1),delta(0)
66 { 67 {
67 g4pow = G4Pow::GetInstance(); 68 g4pow = G4Pow::GetInstance();
68 nwarn = 0; 69 nwarn = 0;
69 } 70 }
70 71
71 G4Generator2BS::~G4Generator2BS() 72 G4Generator2BS::~G4Generator2BS()
72 {} 73 {}
73 74
74 G4ThreeVector& G4Generator2BS::SampleDirection 75 G4ThreeVector& G4Generator2BS::SampleDirection(const G4DynamicParticle* dp,
75 G4double final_energy, 76 G4double final_energy,
76 G4int Z, 77 G4int Z,
77 const G4Material*) 78 const G4Material*)
78 { 79 {
>> 80
79 // Adapted from "Improved bremsstrahlung pho 81 // Adapted from "Improved bremsstrahlung photon angular sampling in the EGS4 code system"
80 // by Alex F. Bielajew, Rahde Mohan anc Chen 82 // by Alex F. Bielajew, Rahde Mohan anc Chen-Shou Chui, PIRS-0203
81 // Ionizing Radiation Standards 83 // Ionizing Radiation Standards
82 // Institute for National Measurement Standa 84 // Institute for National Measurement Standards
83 // National Research Council of Canada 85 // National Research Council of Canada
84 // Departement of Medical Physics, Memorial 86 // Departement of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York
85 87
86 G4double energy = dp->GetTotalEnergy(); 88 G4double energy = dp->GetTotalEnergy();
87 ratio = final_energy/energy; 89 ratio = final_energy/energy;
88 ratio1 = (1 + ratio)*(1 + ratio); 90 ratio1 = (1 + ratio)*(1 + ratio);
89 ratio2 = 1 + ratio*ratio; 91 ratio2 = 1 + ratio*ratio;
90 92
91 G4double gamma = energy/electron_mass_c2; 93 G4double gamma = energy/electron_mass_c2;
92 G4double beta = std::sqrt((gamma - 1)*(gamm 94 G4double beta = std::sqrt((gamma - 1)*(gamma + 1))/gamma;
93 95
>> 96 //G4double Zeff = std::sqrt(static_cast<G4double>(Z) * (static_cast<G4double>(Z) + 1.0));
>> 97 //z = (0.00008116224*(std::pow(Zeff,0.3333333)));
>> 98
94 // VI speadup 99 // VI speadup
95 fz = 0.00008116224*g4pow->Z13(Z)*g4pow->Z13( 100 fz = 0.00008116224*g4pow->Z13(Z)*g4pow->Z13(Z+1);
96 101
97 // majoranta 102 // majoranta
98 G4double ymax = 2*beta*(1 + beta)*gamma*gamm 103 G4double ymax = 2*beta*(1 + beta)*gamma*gamma;
99 G4double gMax = RejectionFunction(0.0); 104 G4double gMax = RejectionFunction(0.0);
100 gMax = std::max(gMax,RejectionFunction(ymax) 105 gMax = std::max(gMax,RejectionFunction(ymax));
101 106
102 G4double y, gfun; 107 G4double y, gfun;
103 108
104 do{ 109 do{
105 G4double q = G4UniformRand(); 110 G4double q = G4UniformRand();
106 y = q*ymax/(1 + ymax*(1 - q)); 111 y = q*ymax/(1 + ymax*(1 - q));
107 gfun = RejectionFunction(y); 112 gfun = RejectionFunction(y);
108 113
109 // violation point 114 // violation point
110 if(gfun > gMax && nwarn >= 20) { 115 if(gfun > gMax && nwarn >= 20) {
111 ++nwarn; 116 ++nwarn;
112 G4cout << "### WARNING in G4Generator2BS 117 G4cout << "### WARNING in G4Generator2BS: Etot(MeV)= " << energy/MeV
113 << " Egamma(MeV)" << (energy - final_e 118 << " Egamma(MeV)" << (energy - final_energy)/MeV
114 << " gMax= " << gMax << " < " << gfun 119 << " gMax= " << gMax << " < " << gfun
115 << " results are not reliable!" 120 << " results are not reliable!"
116 << G4endl; 121 << G4endl;
117 if(20 == nwarn) { 122 if(20 == nwarn) {
118 G4cout << " WARNING in G4Generator2BS is c 123 G4cout << " WARNING in G4Generator2BS is closed" << G4endl;
119 } 124 }
120 } 125 }
121 126
122 } while(G4UniformRand()*gMax > gfun || y > y 127 } while(G4UniformRand()*gMax > gfun || y > ymax);
>> 128
123 129
124 G4double cost = 1 - 2*y/ymax; 130 G4double cost = 1 - 2*y/ymax;
125 G4double sint = std::sqrt((1 - cost)*(1 + co 131 G4double sint = std::sqrt((1 - cost)*(1 + cost));
126 G4double phi = twopi*G4UniformRand(); 132 G4double phi = twopi*G4UniformRand();
127 133
128 fLocalDirection.set(sint*std::cos(phi), sint 134 fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi),cost);
129 fLocalDirection.rotateUz(dp->GetMomentumDire 135 fLocalDirection.rotateUz(dp->GetMomentumDirection());
130 136
131 return fLocalDirection; 137 return fLocalDirection;
132 } 138 }
133 139
134 void G4Generator2BS::PrintGeneratorInformation 140 void G4Generator2BS::PrintGeneratorInformation() const
135 { 141 {
136 G4cout << "\n" << G4endl; 142 G4cout << "\n" << G4endl;
137 G4cout << "Bremsstrahlung Angular Generator 143 G4cout << "Bremsstrahlung Angular Generator is 2BS Generator "
138 << "from 2BS Koch & Motz distribution (Rev 144 << "from 2BS Koch & Motz distribution (Rev Mod Phys 31(4), 920 (1959))" << G4endl;
139 G4cout << "Sampling algorithm adapted from P 145 G4cout << "Sampling algorithm adapted from PIRS-0203" << G4endl;
140 G4cout << "\n" << G4endl; 146 G4cout << "\n" << G4endl;
141 } 147 }
142 148
143 149