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25 // 25 //
26 /// \file eventgenerator/particleGun/src/Prima 26 /// \file eventgenerator/particleGun/src/PrimaryGeneratorAction2.cc
27 /// \brief Implementation of the PrimaryGenera 27 /// \brief Implementation of the PrimaryGeneratorAction2 class
28 // 28 //
29 // 29 //
30 // << 30 // $Id$
>> 31 //
31 //....oooOO0OOooo........oooOO0OOooo........oo 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 //....oooOO0OOooo........oooOO0OOooo........oo 33 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
33 34
34 #include "PrimaryGeneratorAction2.hh" 35 #include "PrimaryGeneratorAction2.hh"
35 <<
36 #include "PrimaryGeneratorAction.hh" 36 #include "PrimaryGeneratorAction.hh"
37 37
38 #include "G4Event.hh" 38 #include "G4Event.hh"
39 #include "G4ParticleDefinition.hh" <<
40 #include "G4ParticleGun.hh" 39 #include "G4ParticleGun.hh"
41 #include "G4ParticleTable.hh" 40 #include "G4ParticleTable.hh"
>> 41 #include "G4ParticleDefinition.hh"
42 #include "G4PhysicalConstants.hh" 42 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh" 43 #include "G4SystemOfUnits.hh"
44 #include "Randomize.hh" 44 #include "Randomize.hh"
45 45
46 //....oooOO0OOooo........oooOO0OOooo........oo 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
47 47
48 PrimaryGeneratorAction2::PrimaryGeneratorActio << 48 PrimaryGeneratorAction2::PrimaryGeneratorAction2(G4ParticleGun* gun)
49 { << 49 : fParticleGun(gun)
>> 50 {
50 // energy distribution 51 // energy distribution
51 // 52 //
52 InitFunction(); 53 InitFunction();
53 } 54 }
54 55
55 //....oooOO0OOooo........oooOO0OOooo........oo 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56 57
>> 58 PrimaryGeneratorAction2::~PrimaryGeneratorAction2()
>> 59 { }
>> 60
>> 61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 62
57 void PrimaryGeneratorAction2::GeneratePrimarie 63 void PrimaryGeneratorAction2::GeneratePrimaries(G4Event* anEvent)
58 { 64 {
59 // uniform solid angle << 65 //cosAlpha uniform in [cos(0), cos(pi)]
60 G4double cosAlpha = 1. - 2 * G4UniformRand() << 66 G4double cosAlpha = 1. - 2*G4UniformRand();
61 G4double sinAlpha = std::sqrt(1. - cosAlpha << 67 G4double sinAlpha = std::sqrt(1. - cosAlpha*cosAlpha);
62 G4double psi = twopi * G4UniformRand(); // << 68 G4double psi = twopi*G4UniformRand(); //psi uniform in [0, 2*pi]
63 G4ThreeVector dir(sinAlpha * std::cos(psi), << 69 G4ThreeVector dir(sinAlpha*std::cos(psi),sinAlpha*std::sin(psi),cosAlpha);
64 70
65 fParticleGun->SetParticleMomentumDirection(d 71 fParticleGun->SetParticleMomentumDirection(dir);
66 << 72
67 // set energy from a tabulated distribution << 73 //set energy from a tabulated distribution
68 // 74 //
69 // G4double energy = RejectAccept(); << 75 //G4double energy = RejectAccept();
70 G4double energy = InverseCumul(); << 76 G4double energy = InverseCumul();
71 fParticleGun->SetParticleEnergy(energy); << 77 fParticleGun->SetParticleEnergy(energy);
72 78
73 // create vertex << 79 //create vertex
74 // << 80 //
75 fParticleGun->GeneratePrimaryVertex(anEvent) 81 fParticleGun->GeneratePrimaryVertex(anEvent);
76 } 82 }
77 //....oooOO0OOooo........oooOO0OOooo........oo 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78 84
79 void PrimaryGeneratorAction2::InitFunction() 85 void PrimaryGeneratorAction2::InitFunction()
80 { 86 {
81 // tabulated function << 87 // tabulated function
82 // Y is assumed positive, linear per segment 88 // Y is assumed positive, linear per segment, continuous
83 // 89 //
84 fNPoints = 16; 90 fNPoints = 16;
85 const G4double xx[] = {37 * keV, 39 * keV, << 91 const G4double xx[] =
86 71 * keV, 75 * keV, << 92 { 37*keV, 39*keV, 45*keV, 51*keV, 57*keV, 69*keV, 71*keV, 75*keV,
87 125 * keV, 145 * keV, << 93 83*keV, 91*keV, 97*keV, 107*keV, 125*keV, 145*keV, 159*keV, 160*keV };
88 << 94
89 const G4double yy[] = {0.000, 0.077, 0.380 << 95 const G4double yy[] =
90 17.644, 18.518, 17.77 << 96 { 0.000, 0.077, 0.380, 2.044, 5.535, 15.077, 12.443, 14.766,
91 << 97 17.644, 18.518, 17.772, 14.776, 8.372, 3.217, 0.194, 0.000 };
92 // copy arrays in std::vector and compute fM << 98
>> 99 //copy arrays in std::vector and compute fMax
93 // 100 //
94 fX.resize(fNPoints); << 101 fX.resize(fNPoints); fY.resize(fNPoints);
95 fY.resize(fNPoints); <<
96 fYmax = 0.; 102 fYmax = 0.;
97 for (G4int j = 0; j < fNPoints; j++) { << 103 for (G4int j=0; j<fNPoints; j++) {
98 fX[j] = xx[j]; << 104 fX[j] = xx[j]; fY[j] = yy[j];
99 fY[j] = yy[j]; <<
100 if (fYmax < fY[j]) fYmax = fY[j]; 105 if (fYmax < fY[j]) fYmax = fY[j];
101 }; 106 };
102 << 107
103 // compute slopes << 108 //compute slopes
104 // 109 //
105 fSlp.resize(fNPoints); 110 fSlp.resize(fNPoints);
106 for (G4int j = 0; j < fNPoints - 1; j++) { << 111 for (G4int j=0; j<fNPoints-1; j++) {
107 fSlp[j] = (fY[j + 1] - fY[j]) / (fX[j + 1] << 112 fSlp[j] = (fY[j+1] - fY[j])/(fX[j+1] - fX[j]);
108 }; 113 };
109 << 114
110 // compute cumulative function << 115 //compute cumulative function
111 // 116 //
112 fYC.resize(fNPoints); << 117 fYC.resize(fNPoints);
113 fYC[0] = 0.; 118 fYC[0] = 0.;
114 for (G4int j = 1; j < fNPoints; j++) { << 119 for (G4int j=1; j<fNPoints; j++) {
115 fYC[j] = fYC[j - 1] + 0.5 * (fY[j] + fY[j << 120 fYC[j] = fYC[j-1] + 0.5*(fY[j] + fY[j-1])*(fX[j] - fX[j-1]);
116 }; << 121 };
117 } 122 }
118 123
119 //....oooOO0OOooo........oooOO0OOooo........oo 124 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
120 125
121 G4double PrimaryGeneratorAction2::RejectAccept 126 G4double PrimaryGeneratorAction2::RejectAccept()
122 { 127 {
123 // tabulated function << 128 // tabulated function
124 // Y is assumed positive, linear per segment 129 // Y is assumed positive, linear per segment, continuous
125 // (see Particle Data Group: pdg.lbl.gov --> << 130 //
126 // <<
127 G4double Xrndm = 0., Yrndm = 0., Yinter = -1 131 G4double Xrndm = 0., Yrndm = 0., Yinter = -1.;
128 << 132
129 while (Yrndm > Yinter) { 133 while (Yrndm > Yinter) {
130 // choose a point randomly << 134 //choose a point randomly
131 Xrndm = fX[0] + G4UniformRand() * (fX[fNPo << 135 Xrndm = fX[0] + G4UniformRand()*(fX[fNPoints-1] - fX[0]);
132 Yrndm = G4UniformRand() * fYmax; << 136 Yrndm = G4UniformRand()*fYmax;
133 // find bin << 137 //find bin
134 G4int j = fNPoints - 2; << 138 G4int j = fNPoints-2;
135 while ((fX[j] > Xrndm) && (j > 0)) << 139 while ((fX[j] > Xrndm) && (j > 0)) j--;
136 j--; << 140 //compute Y(x_rndm) by linear interpolation
137 // compute Y(x_rndm) by linear interpolati << 141 Yinter = fY[j] + fSlp[j]*(Xrndm - fX[j]);
138 Yinter = fY[j] + fSlp[j] * (Xrndm - fX[j]) <<
139 }; 142 };
140 return Xrndm; 143 return Xrndm;
141 } 144 }
142 145
143 //....oooOO0OOooo........oooOO0OOooo........oo 146 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
144 147
145 G4double PrimaryGeneratorAction2::InverseCumul 148 G4double PrimaryGeneratorAction2::InverseCumul()
146 { 149 {
147 // tabulated function 150 // tabulated function
148 // Y is assumed positive, linear per segment << 151 // Y is assumed positive, linear per segment, continuous
149 // --> cumulative function is second order p 152 // --> cumulative function is second order polynomial
150 // (see Particle Data Group: pdg.lbl.gov --> << 153
151 << 154 //choose y randomly
152 // choose y randomly << 155 G4double Yrndm = G4UniformRand()*fYC[fNPoints-1];
153 G4double Yrndm = G4UniformRand() * fYC[fNPoi << 156 //find bin
154 // find bin << 157 G4int j = fNPoints-2;
155 G4int j = fNPoints - 2; << 158 while ((fYC[j] > Yrndm) && (j > 0)) j--;
156 while ((fYC[j] > Yrndm) && (j > 0)) << 159 //y_rndm --> x_rndm : fYC(x) is second order polynomial
157 j--; <<
158 // y_rndm --> x_rndm : fYC(x) is second ord <<
159 G4double Xrndm = fX[j]; 160 G4double Xrndm = fX[j];
160 G4double a = fSlp[j]; 161 G4double a = fSlp[j];
161 if (a != 0.) { 162 if (a != 0.) {
162 G4double b = fY[j] / a, c = 2 * (Yrndm - f << 163 G4double b = fY[j]/a, c = 2*(Yrndm - fYC[j])/a;
163 G4double delta = b * b + c; << 164 G4double delta = b*b + c;
164 G4int sign = 1; << 165 G4int sign = 1; if (a < 0.) sign = -1;
165 if (a < 0.) sign = -1; << 166 Xrndm += sign*std::sqrt(delta) - b;
166 Xrndm += sign * std::sqrt(delta) - b; << 167 } else if (fY[j] > 0.) {
167 } << 168 Xrndm += (Yrndm - fYC[j])/fY[j];
168 else if (fY[j] > 0.) { <<
169 Xrndm += (Yrndm - fYC[j]) / fY[j]; <<
170 }; 169 };
171 return Xrndm; 170 return Xrndm;
172 } 171 }
173 172
174 //....oooOO0OOooo........oooOO0OOooo........oo 173 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
175 174