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28 // 28 //
29 // 21.03.17 V. Grichine based on G4hBremsstrah 29 // 21.03.17 V. Grichine based on G4hBremsstrahlungModel
30 // 30 //
31 // Class Description: 31 // Class Description:
32 // 32 //
33 // Implementation of energy loss for LDMPhoton 33 // Implementation of energy loss for LDMPhoton emission by hadrons
34 // 34 //
35 35
36 //....oooOO0OOooo........oooOO0OOooo........oo 36 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
37 37
38 #include "G4LDMBremModel.hh" 38 #include "G4LDMBremModel.hh"
39 <<
40 #include "TestParameters.hh" <<
41 <<
42 #include "G4LDMPhoton.hh" <<
43 #include "G4Log.hh" <<
44 #include "G4ParticleChangeForLoss.hh" <<
45 #include "G4PhysicalConstants.hh" 39 #include "G4PhysicalConstants.hh"
46 #include "G4SystemOfUnits.hh" 40 #include "G4SystemOfUnits.hh"
>> 41 #include "G4Log.hh"
>> 42 #include "G4LDMPhoton.hh"
>> 43 #include "G4ParticleChangeForLoss.hh"
>> 44 #include "TestParameters.hh"
47 45
48 //....oooOO0OOooo........oooOO0OOooo........oo 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49 47
50 using namespace std; 48 using namespace std;
51 49
52 G4LDMBremModel::G4LDMBremModel(const G4Particl << 50 G4LDMBremModel::G4LDMBremModel(const G4ParticleDefinition* p,
>> 51 const G4String& nam)
53 : G4MuBremsstrahlungModel(p, nam) 52 : G4MuBremsstrahlungModel(p, nam)
54 { 53 {
55 fEpsilon = TestParameters::GetPointer()->Get 54 fEpsilon = TestParameters::GetPointer()->GetAlphaFactor();
56 theLDMPhoton = G4LDMPhoton::LDMPhoton(); 55 theLDMPhoton = G4LDMPhoton::LDMPhoton();
57 fLDMPhotonMass = theLDMPhoton->GetPDGMass(); 56 fLDMPhotonMass = theLDMPhoton->GetPDGMass();
58 minThreshold = 1.2 * fLDMPhotonMass; << 57 minThreshold = 1.2*fLDMPhotonMass;
59 } 58 }
60 59
61 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
62 61
63 G4LDMBremModel::~G4LDMBremModel() {} << 62 G4LDMBremModel::~G4LDMBremModel()
>> 63 {}
64 64
65 //....oooOO0OOooo........oooOO0OOooo........oo 65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
66 66
67 G4double G4LDMBremModel::ComputeDEDXPerVolume( << 67 G4double G4LDMBremModel::ComputeDEDXPerVolume(const G4Material*,
>> 68 const G4ParticleDefinition*,
68 69 G4double, G4double)
69 { 70 {
70 return 0.0; 71 return 0.0;
71 } 72 }
72 73
73 //....oooOO0OOooo........oooOO0OOooo........oo 74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
74 75
75 G4double G4LDMBremModel::ComputeDMicroscopicCr << 76 G4double G4LDMBremModel::ComputeDMicroscopicCrossSection(
76 << 77 G4double tkin,
>> 78 G4double Z,
>> 79 G4double gammaEnergy)
77 // differential cross section 80 // differential cross section
78 { 81 {
79 G4double dxsection = 0.; 82 G4double dxsection = 0.;
80 83
81 if (gammaEnergy > tkin || tkin < minThreshol << 84 if( gammaEnergy > tkin || tkin < minThreshold) return dxsection;
82 /* 85 /*
83 G4cout << "G4LDMBremModel m= " << mass << 86 G4cout << "G4LDMBremModel m= " << mass
84 << " " << particle->GetParticleName( << 87 << " " << particle->GetParticleName()
85 << " Egamma(GeV)= " << gammaEnergy/G << 88 << " Egamma(GeV)= " << gammaEnergy/GeV
86 << " Ekin(GeV)= " << tkin/GeV << G4e 89 << " Ekin(GeV)= " << tkin/GeV << G4endl;
87 */ 90 */
88 G4double E = tkin + mass; << 91 G4double E = tkin + mass ;
89 G4double v = gammaEnergy / E; << 92 G4double v = gammaEnergy/E ;
90 G4double delta = 0.5 * mass * mass * v / (E << 93 G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
91 G4double rab0 = delta * sqrte; << 94 G4double rab0=delta*sqrte ;
92 95
93 G4int iz = std::max(1, std::min(G4lrint(Z), << 96 G4int iz = std::max(1,std::min(G4lrint(Z),99));
94 97
95 G4double z13 = 1.0 / nist->GetZ13(iz); << 98 G4double z13 = 1.0/nist->GetZ13(iz);
96 G4double dn = mass * nist->GetA27(iz) / (70. << 99 G4double dn = mass*nist->GetA27(iz)/(70.*MeV);
97 100
98 G4double b = btf; << 101 G4double b = btf;
99 if (1 == iz) b = bh; << 102 if(1 == iz) b = bh;
100 103
101 // nucleus contribution logarithm 104 // nucleus contribution logarithm
102 G4double rab1 = b * z13; << 105 G4double rab1=b*z13;
103 G4double fn = << 106 G4double fn=G4Log(rab1/(dn*(electron_mass_c2+rab0*rab1))*
104 G4Log(rab1 / (dn * (electron_mass_c2 + rab << 107 (mass+delta*(dn*sqrte-2.))) ;
105 if (fn < 0.) fn = 0.; << 108 if(fn <0.) fn = 0. ;
106 109
107 G4double x = 1.0 - v; 110 G4double x = 1.0 - v;
108 111
109 if (particle->GetPDGSpin() != 0) { << 112 if(particle->GetPDGSpin() != 0) { x += 0.75*v*v; }
110 x += 0.75 * v * v; <<
111 } <<
112 113
113 dxsection = coeff * x * Z * Z * fn / gammaEn << 114 dxsection = coeff*x*Z*Z*fn/gammaEnergy;
114 return dxsection; 115 return dxsection;
115 } 116 }
116 117
117 //....oooOO0OOooo........oooOO0OOooo........oo 118 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
118 119
119 G4double G4LDMBremModel::ComputeCrossSectionPe << 120 G4double G4LDMBremModel::ComputeCrossSectionPerAtom(
120 << 121 const G4ParticleDefinition*,
121 << 122 G4double kineticEnergy,
>> 123 G4double Z, G4double,
>> 124 G4double cutEnergy,
>> 125 G4double maxEnergy)
122 { 126 {
123 G4double cross = 0.0; 127 G4double cross = 0.0;
124 << 128
125 if (kineticEnergy <= lowestKinEnergy) return 129 if (kineticEnergy <= lowestKinEnergy) return cross;
126 130
127 G4double tmax = std::min(maxEnergy, kineticE 131 G4double tmax = std::min(maxEnergy, kineticEnergy);
128 G4double cut = std::min(cutEnergy, kineticEn << 132 G4double cut = std::min(cutEnergy, kineticEnergy);
129 << 133
130 cut = std::max(cut, minThreshold); 134 cut = std::max(cut, minThreshold);
131 if (cut >= tmax) return cross; 135 if (cut >= tmax) return cross;
132 136
133 cross = ComputeMicroscopicCrossSection(kinet << 137 cross = ComputeMicroscopicCrossSection (kineticEnergy, Z, cut);
134 138
135 if (tmax < kineticEnergy) { << 139 if(tmax < kineticEnergy)
>> 140 {
136 cross -= ComputeMicroscopicCrossSection(ki 141 cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
137 } 142 }
138 cross *= fEpsilon * fEpsilon; << 143 cross *= fEpsilon*fEpsilon;
139 144
140 return cross; 145 return cross;
141 } 146 }
142 147
143 //....oooOO0OOooo........oooOO0OOooo........oo 148 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
144 149
145 void G4LDMBremModel::SampleSecondaries(std::ve << 150 void G4LDMBremModel::SampleSecondaries(
146 const G << 151 std::vector<G4DynamicParticle*>* vdp,
147 const G << 152 const G4MaterialCutsCouple* couple,
148 G4doubl << 153 const G4DynamicParticle* dp,
>> 154 G4double minEnergy,
>> 155 G4double maxEnergy)
149 { 156 {
150 G4double kineticEnergy = dp->GetKineticEnerg 157 G4double kineticEnergy = dp->GetKineticEnergy();
151 // check against insufficient energy 158 // check against insufficient energy
152 G4double tmax = std::min(kineticEnergy, maxE 159 G4double tmax = std::min(kineticEnergy, maxEnergy);
153 G4double tmin = std::min(kineticEnergy, minE 160 G4double tmin = std::min(kineticEnergy, minEnergy);
154 tmin = std::max(tmin, minThreshold); 161 tmin = std::max(tmin, minThreshold);
155 if (tmin >= tmax) return; << 162 if(tmin >= tmax) return;
156 163
157 // ===== sampling of energy transfer ====== 164 // ===== sampling of energy transfer ======
158 165
159 G4ParticleMomentum partDirection = dp->GetMo 166 G4ParticleMomentum partDirection = dp->GetMomentumDirection();
160 167
161 // select randomly one element constituing t 168 // select randomly one element constituing the material
162 const G4Element* anElement = SelectRandomAto << 169 const G4Element* anElement = SelectRandomAtom(couple,particle,kineticEnergy);
163 G4double Z = anElement->GetZ(); 170 G4double Z = anElement->GetZ();
164 171
165 G4double totalEnergy = kineticEnergy + mass; << 172 G4double totalEnergy = kineticEnergy + mass;
166 G4double totalMomentum = sqrt(kineticEnergy << 173 G4double totalMomentum = sqrt(kineticEnergy*(kineticEnergy + 2.0*mass));
167 174
168 G4double func1 = tmin * ComputeDMicroscopicC << 175 G4double func1 = tmin*
>> 176 ComputeDMicroscopicCrossSection(kineticEnergy,Z,tmin);
169 177
170 G4double lnepksi, epksi; 178 G4double lnepksi, epksi;
171 G4double func2; 179 G4double func2;
172 180
173 G4double xmin = G4Log(tmin / MeV); << 181 G4double xmin = G4Log(tmin/MeV);
174 G4double xmax = G4Log(tmax / tmin); << 182 G4double xmax = G4Log(tmax/tmin);
175 183
176 do { << 184 do
177 lnepksi = xmin + G4UniformRand() * xmax; << 185 {
178 epksi = MeV * G4Exp(lnepksi); << 186 lnepksi = xmin + G4UniformRand()*xmax;
179 func2 = epksi * ComputeDMicroscopicCrossSe << 187 epksi = MeV*G4Exp(lnepksi);
>> 188 func2 = epksi*ComputeDMicroscopicCrossSection(kineticEnergy,Z,epksi);
180 189
181 // Loop checking, 03-Aug-2015, Vladimir Iv 190 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
182 } while (func2 < func1 * G4UniformRand()); << 191 } while(func2 < func1*G4UniformRand());
183 192
184 G4double gEnergy = std::max(epksi, fLDMPhoto 193 G4double gEnergy = std::max(epksi, fLDMPhotonMass);
185 G4double gMomentum = std::sqrt((epksi - fLDM << 194 G4double gMomentum =
>> 195 std::sqrt((epksi - fLDMPhotonMass)*(epksi + fLDMPhotonMass));
186 196
187 // ===== sample angle ===== 197 // ===== sample angle =====
188 198
189 G4double gam = totalEnergy / mass; << 199 G4double gam = totalEnergy/mass;
190 G4double rmax = gam * std::min(1.0, totalEne << 200 G4double rmax = gam*std::min(1.0, totalEnergy/gEnergy - 1.0);
191 G4double rmax2 = rmax * rmax; << 201 G4double rmax2= rmax*rmax;
192 G4double x = G4UniformRand() * rmax2 / (1.0 << 202 G4double x = G4UniformRand()*rmax2/(1.0 + rmax2);
193 << 203
194 G4double theta = std::sqrt(x / (1.0 - x)) / << 204 G4double theta = std::sqrt(x/(1.0 - x))/gam;
195 G4double sint = std::sin(theta); << 205 G4double sint = std::sin(theta);
196 G4double phi = twopi * G4UniformRand(); << 206 G4double phi = twopi * G4UniformRand() ;
197 G4double dirx = sint * cos(phi), diry = sint << 207 G4double dirx = sint*cos(phi), diry = sint*sin(phi), dirz = cos(theta) ;
198 208
199 G4ThreeVector gDirection(dirx, diry, dirz); 209 G4ThreeVector gDirection(dirx, diry, dirz);
200 gDirection.rotateUz(partDirection); 210 gDirection.rotateUz(partDirection);
201 211
202 partDirection *= totalMomentum; 212 partDirection *= totalMomentum;
203 partDirection -= gMomentum * gDirection; << 213 partDirection -= gMomentum*gDirection;
204 partDirection = partDirection.unit(); 214 partDirection = partDirection.unit();
205 215
206 // primary change 216 // primary change
207 217
208 kineticEnergy -= gEnergy; 218 kineticEnergy -= gEnergy;
209 219
210 fParticleChange->SetProposedKineticEnergy(ki 220 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
211 fParticleChange->SetProposedMomentumDirectio 221 fParticleChange->SetProposedMomentumDirection(partDirection);
212 222
213 // save secondary 223 // save secondary
214 G4DynamicParticle* aLDMPhoton = new G4Dynami << 224 G4DynamicParticle* aLDMPhoton =
>> 225 new G4DynamicParticle(theLDMPhoton,gDirection,gEnergy);
215 vdp->push_back(aLDMPhoton); 226 vdp->push_back(aLDMPhoton);
216 } 227 }
217 228
218 //....oooOO0OOooo........oooOO0OOooo........oo 229 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
219 230