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25 // 25 //
>> 26 // $Id: G4Generator2BS.cc,v 1.10 2010-10-14 14:01:02 vnivanch Exp $
>> 27 // GEANT4 tag $Name: not supported by cvs2svn $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4Generator2BS 34 // File name: G4Generator2BS
33 // 35 //
34 // Author: Andreia Trindade (andreia@li 36 // Author: Andreia Trindade (andreia@lip.pt)
35 // Pedro Rodrigues (psilva@lip 37 // Pedro Rodrigues (psilva@lip.pt)
36 // Luis Peralta (luis@lip.p 38 // Luis Peralta (luis@lip.pt)
37 // 39 //
38 // Creation date: 2 June 2003 40 // Creation date: 2 June 2003
39 // 41 //
40 // Modifications: 42 // Modifications:
41 // 02 Jun 2003 First implementat 43 // 02 Jun 2003 First implementation acording with new design
42 // 05 Nov 2003 MGP Fixed std namespa 44 // 05 Nov 2003 MGP Fixed std namespace
43 // 17 Nov 2003 MGP Fixed compilation 45 // 17 Nov 2003 MGP Fixed compilation problem on Windows
44 // 12 Oct 2010 V.Ivanchenko Moved RejectionFu 46 // 12 Oct 2010 V.Ivanchenko Moved RejectionFunction inline, use G4Pow to speadup
45 // 09 May 2011 L.Pandola Initialize privat 47 // 09 May 2011 L.Pandola Initialize private members, to avoid Coverity warning
46 // 48 //
47 // Class Description: 49 // Class Description:
48 // 50 //
49 // Concrete base class for Bremsstrahlung Angu 51 // Concrete base class for Bremsstrahlung Angular Distribution Generation
50 // 2BS Distribution 52 // 2BS Distribution
51 // 53 //
52 // Class Description: End 54 // Class Description: End
53 // 55 //
54 // ------------------------------------------- 56 // -------------------------------------------------------------------
55 // 57 //
56 58
57 #include "G4Generator2BS.hh" 59 #include "G4Generator2BS.hh"
58 #include "Randomize.hh" 60 #include "Randomize.hh"
59 #include "G4PhysicalConstants.hh" <<
60 #include "G4SystemOfUnits.hh" <<
61 #include "G4Pow.hh" 61 #include "G4Pow.hh"
62 62
>> 63 //
>> 64
63 G4Generator2BS::G4Generator2BS(const G4String& 65 G4Generator2BS::G4Generator2BS(const G4String&)
64 : G4VEmAngularDistribution("AngularGen2BS"), << 66 : G4VBremAngularDistribution("AngularGen2BS"),z(1),rejection_argument1(0),
65 ratio1(1.),ratio2(1.),delta(0.) << 67 rejection_argument2(0),rejection_argument3(0),EnergyRatio(1)
66 { 68 {
67 g4pow = G4Pow::GetInstance(); 69 g4pow = G4Pow::GetInstance();
68 nwarn = 0; <<
69 } 70 }
70 71
>> 72 //
>> 73
71 G4Generator2BS::~G4Generator2BS() 74 G4Generator2BS::~G4Generator2BS()
72 {} 75 {}
73 76
74 G4ThreeVector& G4Generator2BS::SampleDirection << 77 //
75 G4double final_energy, << 78
76 G4int Z, << 79 G4double G4Generator2BS::PolarAngle(const G4double initial_energy,
77 const G4Material*) << 80 const G4double final_energy,
>> 81 const G4int Z)
78 { 82 {
>> 83
79 // Adapted from "Improved bremsstrahlung pho 84 // Adapted from "Improved bremsstrahlung photon angular sampling in the EGS4 code system"
80 // by Alex F. 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