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25 // 25 //
>> 26 // $Id: G4eBremsstrahlungRelModel.hh 75582 2013-11-04 12:13:01Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class header file 30 // GEANT4 Class header file
30 // 31 //
31 // 32 //
32 // File name: G4eBremsstrahlungRelModel 33 // File name: G4eBremsstrahlungRelModel
33 // extention of standard G4eBre 34 // extention of standard G4eBremsstrahlungModel
34 // 35 //
35 // Author: Andreas Schaelicke << 36 // Author: Andreas Schaelicke
36 // 37 //
37 // Creation date: 28.03.2008 38 // Creation date: 28.03.2008
38 // 39 //
39 // Modifications: 40 // Modifications:
40 // 41 //
41 // 15.07.18 introduced data structures to sto <<
42 // dent data for faster run-time com <<
43 // 42 //
44 // Class Description: 43 // Class Description:
45 // 44 //
46 // Implementation of energy loss for gamma emi 45 // Implementation of energy loss for gamma emission by electrons and
47 // positrons including an improved version of 46 // positrons including an improved version of the LPM effect
48 47
49 // ------------------------------------------- 48 // -------------------------------------------------------------------
50 // 49 //
51 50
52 #ifndef G4eBremsstrahlungRelModel_h 51 #ifndef G4eBremsstrahlungRelModel_h
53 #define G4eBremsstrahlungRelModel_h 1 52 #define G4eBremsstrahlungRelModel_h 1
54 53
55 #include "G4VEmModel.hh" 54 #include "G4VEmModel.hh"
56 #include <memory> << 55 #include "G4NistManager.hh"
>> 56 #include "G4Exp.hh"
>> 57 #include "G4Log.hh"
57 58
58 class G4ParticleChangeForLoss; 59 class G4ParticleChangeForLoss;
>> 60 class G4PhysicsVector;
59 61
60 class G4eBremsstrahlungRelModel : public G4VEm << 62 class G4eBremsstrahlungRelModel : public G4VEmModel
>> 63 {
61 64
62 public: 65 public:
63 66
64 explicit G4eBremsstrahlungRelModel(const G4P << 67 G4eBremsstrahlungRelModel(const G4ParticleDefinition* p = 0,
65 const G4S << 68 const G4String& nam = "eBremLPM");
66 69
67 ~G4eBremsstrahlungRelModel() override; << 70 virtual ~G4eBremsstrahlungRelModel();
68 71
69 void Initialise(const G4ParticleDefinition*, << 72 virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
>> 73
>> 74 virtual void InitialiseLocal(const G4ParticleDefinition*,
>> 75 G4VEmModel* masterModel);
>> 76
>> 77 virtual G4double ComputeDEDXPerVolume(const G4Material*,
>> 78 const G4ParticleDefinition*,
>> 79 G4double kineticEnergy,
>> 80 G4double cutEnergy);
>> 81
>> 82 virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
>> 83 G4double tkin,
>> 84 G4double Z, G4double,
>> 85 G4double cutEnergy,
>> 86 G4double maxEnergy = DBL_MAX);
>> 87
>> 88 virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
>> 89 const G4MaterialCutsCouple*,
>> 90 const G4DynamicParticle*,
>> 91 G4double cutEnergy,
>> 92 G4double maxEnergy);
>> 93
>> 94 virtual void SetupForMaterial(const G4ParticleDefinition*,
>> 95 const G4Material*,G4double);
>> 96
>> 97 virtual G4double MinPrimaryEnergy(const G4Material*,
>> 98 const G4ParticleDefinition*,
>> 99 G4double cut);
>> 100
>> 101 inline void SetLPMconstant(G4double val);
>> 102 inline G4double LPMconstant() const;
>> 103
>> 104 inline void SetLowestKinEnergy(G4double);
>> 105 inline G4double LowestKinEnergy() const;
70 106
71 void InitialiseLocal(const G4ParticleDefinit <<
72 G4VEmModel* masterModel <<
73 <<
74 G4double ComputeDEDXPerVolume(const G4Materi <<
75 const G4Partic <<
76 G4double ekin, <<
77 G4double cutEn <<
78 <<
79 G4double ComputeCrossSectionPerAtom(const G4 <<
80 G4double <<
81 G4double <<
82 G4double <<
83 G4double <<
84 G4double <<
85 <<
86 void SampleSecondaries(std::vector<G4Dynamic <<
87 const G4MaterialCutsC <<
88 const G4DynamicPartic <<
89 G4double cutEnergy, <<
90 G4double maxEnergy) o <<
91 <<
92 void SetupForMaterial(const G4ParticleDefini <<
93 const G4Material*, G4d <<
94 <<
95 G4double MinPrimaryEnergy(const G4Material*, <<
96 const G4ParticleDe <<
97 G4double cutEnergy <<
98 107
99 protected: 108 protected:
100 109
101 virtual G4double ComputeDXSectionPerAtom(G4d 110 virtual G4double ComputeDXSectionPerAtom(G4double gammaEnergy);
102 111
103 void SetParticle(const G4ParticleDefinition* << 112 // * fast inline functions *
>> 113 inline void SetCurrentElement(const G4double);
104 114
105 private: 115 private:
106 116
>> 117 void InitialiseConstants();
>> 118
>> 119 void CalcLPMFunctions(G4double gammaEnergy);
>> 120
107 G4double ComputeBremLoss(G4double cutEnergy) 121 G4double ComputeBremLoss(G4double cutEnergy);
108 122
109 G4double ComputeXSectionPerAtom(G4double cut 123 G4double ComputeXSectionPerAtom(G4double cutEnergy);
110 124
111 G4double ComputeRelDXSectionPerAtom(G4double 125 G4double ComputeRelDXSectionPerAtom(G4double gammaEnergy);
112 126
113 // init special data per element i.e. per Z << 127 void SetParticle(const G4ParticleDefinition* p);
114 void InitialiseElementData(); <<
115 128
116 // methods for initialisation and run-time e << 129 inline G4double Phi1(G4double,G4double);
117 void InitLPMFunctions(); << 130 inline G4double Phi1M2(G4double,G4double);
>> 131 inline G4double Psi1(G4double,G4double);
>> 132 inline G4double Psi1M2(G4double,G4double);
>> 133
>> 134 // hide assignment operator
>> 135 G4eBremsstrahlungRelModel & operator=(const G4eBremsstrahlungRelModel &right);
>> 136 G4eBremsstrahlungRelModel(const G4eBremsstrahlungRelModel&);
118 137
119 void ComputeLPMfunctions(G4double& funcXiS, << 138 protected:
120 G4double& funcGS, <<
121 G4double& funcPhiS, <<
122 const G4double egam <<
123 <<
124 void GetLPMFunctions(G4double& lpmGs, <<
125 G4double& lpmPhis, <<
126 const G4double ss); <<
127 <<
128 void ComputeLPMGsPhis(G4double& funcGS, <<
129 G4double& funcPhiS, <<
130 const G4double varShat <<
131 <<
132 // for evaluating screening related function <<
133 void ComputeScreeningFunctions(G4double& phi <<
134 G4double& phi <<
135 G4double& psi <<
136 G4double& psi <<
137 const G4doubl <<
138 const G4doubl <<
139 // hide assignment operator and cctr <<
140 G4eBremsstrahlungRelModel& operator= <<
141 (const G4eBremsstrahlungRelModel& right) = d <<
142 G4eBremsstrahlungRelModel(const G4eBremsstr <<
143 139
144 private: << 140 G4NistManager* nist;
>> 141 const G4ParticleDefinition* particle;
>> 142 G4ParticleDefinition* theGamma;
>> 143 G4ParticleChangeForLoss* fParticleChange;
145 144
146 G4bool fIsUseCompleteSc << 145 G4double bremFactor;
147 G4bool fIsInitializer = <<
148 G4bool fUseLPM = true; <<
149 146
150 protected: <<
151 <<
152 G4bool fIsElectron = tr <<
153 G4bool fIsScatOffElectr <<
154 G4bool fIsLPMActive = f <<
155 // <<
156 G4int fCurrentIZ = 0; <<
157 const G4ParticleDefinition* fPrimaryParticle <<
158 G4ParticleDefinition* fGammaParticle = <<
159 G4ParticleChangeForLoss* fParticleChange <<
160 // cash 147 // cash
161 G4double fPrimaryParticle << 148 G4double particleMass;
162 G4double fPrimaryKinEnerg << 149 G4double kinEnergy;
163 G4double fPrimaryTotalEne << 150 G4double totalEnergy;
164 G4double fDensityFactor = << 151 G4double currentZ;
165 G4double fDensityCorr = 0 << 152 G4double densityFactor;
166 G4double fLowestKinEnergy << 153 G4double densityCorr;
167 // scattering off electrons << 154
168 G4double fNucTerm = 0.; << 155 G4bool isElectron;
169 G4double fSumTerm = 0.; <<
170 156
171 private: 157 private:
172 158
173 // LPM related members << 159 static const G4double xgi[8], wgi[8];
174 G4double fLPMEnergyThresh << 160 static const G4double Fel_light[5];
175 G4double fLPMEnergy; << 161 static const G4double Finel_light[5];
>> 162
>> 163 // consts
>> 164 G4double lowestKinEnergy;
>> 165 G4double fMigdalConstant;
>> 166 G4double fLPMconstant;
>> 167 G4double energyThresholdLPM;
>> 168 G4double facFel, facFinel;
>> 169 G4double preS1,logTwo;
176 170
177 protected: << 171 // cash
>> 172 G4double z13, z23, lnZ;
>> 173 G4double Fel, Finel, fCoulomb, fMax;
178 174
179 static const G4double gBremFactor; << 175 // LPM effect
180 static const G4double gMigdalConstant; << 176 G4double lpmEnergy;
>> 177 G4PhysicsVector *fXiLPM, *fPhiLPM, *fGLPM;
>> 178 G4double xiLPM, phiLPM, gLPM;
>> 179
>> 180 // critical gamma energies
>> 181 G4double klpm, kp;
>> 182
>> 183 // flags
>> 184 G4bool use_completescreening;
>> 185 G4bool isInitialised;
>> 186 };
181 187
182 private: << 188 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 189
>> 190 inline void G4eBremsstrahlungRelModel::SetCurrentElement(const G4double Z)
>> 191 {
>> 192 if(Z != currentZ) {
>> 193 currentZ = Z;
>> 194
>> 195 G4int iz = G4int(Z);
>> 196 z13 = nist->GetZ13(iz);
>> 197 z23 = z13*z13;
>> 198 lnZ = nist->GetLOGZ(iz);
>> 199
>> 200 if (iz <= 4) {
>> 201 Fel = Fel_light[iz];
>> 202 Finel = Finel_light[iz] ;
>> 203 }
>> 204 else {
>> 205 Fel = facFel - lnZ/3. ;
>> 206 Finel = facFinel - 2.*lnZ/3. ;
>> 207 }
>> 208
>> 209 fCoulomb = GetCurrentElement()->GetfCoulomb();
>> 210 fMax = Fel-fCoulomb + Finel/currentZ + (1.+1./currentZ)/12.;
>> 211 }
>> 212 }
>> 213
>> 214 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 215
>> 216
>> 217 inline G4double G4eBremsstrahlungRelModel::Phi1(G4double gg, G4double)
>> 218 {
>> 219 // Thomas-Fermi FF from Tsai, eq.(3.38) for Z>=5
>> 220 return 20.863 - 2.*G4Log(1. + sqr(0.55846*gg) )
>> 221 - 4.*( 1. - 0.6*G4Exp(-0.9*gg) - 0.4*G4Exp(-1.5*gg) );
>> 222 }
>> 223
>> 224 inline G4double G4eBremsstrahlungRelModel::Phi1M2(G4double gg, G4double)
>> 225 {
>> 226 // Thomas-Fermi FF from Tsai, eq. (3.39) for Z>=5
>> 227 // return Phi1(gg,Z) -
>> 228 return 2./(3.*(1. + 6.5*gg +6.*gg*gg) );
>> 229 }
>> 230
>> 231 inline G4double G4eBremsstrahlungRelModel::Psi1(G4double eps, G4double)
>> 232 {
>> 233 // Thomas-Fermi FF from Tsai, eq.(3.40) for Z>=5
>> 234 return 28.340 - 2.*G4Log(1. + sqr(3.621*eps) )
>> 235 - 4.*( 1. - 0.7*G4Exp(-8*eps) - 0.3*G4Exp(-29.*eps) );
>> 236 }
>> 237
>> 238 inline G4double G4eBremsstrahlungRelModel::Psi1M2(G4double eps, G4double)
>> 239 {
>> 240 // Thomas-Fermi FF from Tsai, eq. (3.41) for Z>=5
>> 241 return 2./(3.*(1. + 40.*eps +400.*eps*eps) );
>> 242 }
>> 243
>> 244 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 245
>> 246 inline
>> 247 void G4eBremsstrahlungRelModel::SetLPMconstant(G4double val)
>> 248 {
>> 249 fLPMconstant = val;
>> 250 }
>> 251
>> 252 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 253
>> 254 inline
>> 255 G4double G4eBremsstrahlungRelModel::LPMconstant() const
>> 256 {
>> 257 return fLPMconstant;
>> 258 }
>> 259
>> 260 inline void G4eBremsstrahlungRelModel::SetLowestKinEnergy(G4double val)
>> 261 {
>> 262 lowestKinEnergy = val;
>> 263 }
>> 264
>> 265 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 266
>> 267 inline G4double G4eBremsstrahlungRelModel::LowestKinEnergy() const
>> 268 {
>> 269 return lowestKinEnergy;
>> 270 }
>> 271
>> 272 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
183 273
184 static const G4int gMaxZet; <<
185 // <<
186 static const G4double gLPMconstant; <<
187 // <<
188 static const G4double gXGL[8]; <<
189 static const G4double gWGL[8]; <<
190 static const G4double gFelLowZet[8]; <<
191 static const G4double gFinelLowZet[8]; <<
192 // <<
193 struct ElementData { <<
194 /** @brief \f$ \ln(Z) \f$ */ <<
195 G4double fLogZ; <<
196 /** @brief \f$ \ln(Z)/3 + f_c \f$ */ <<
197 G4double fFz; <<
198 /** @brief \f$ ((Fel-fc)+Finel*invZ)\f$ * <<
199 G4double fZFactor1; <<
200 /** @brief \f$ (Fel-fc)\f$ */ <<
201 G4double fZFactor11; <<
202 /** @brief \f$ (1.0+invZ)/12 \f$ */ <<
203 G4double fZFactor2; <<
204 // LPM variables <<
205 G4double fVarS1; <<
206 G4double fILVarS1; <<
207 G4double fILVarS1Cond; <<
208 // constant factors to the screening funct <<
209 G4double fGammaFactor; <<
210 G4double fEpsilonFactor; <<
211 }; <<
212 // <<
213 struct LPMFuncs { <<
214 LPMFuncs() : fIsInitialized(false), fISDel <<
215 G4bool fIsInitialized; <<
216 G4double fISDelta; <<
217 G4double fSLimit; <<
218 std::vector<G4double> fLPMFuncG; <<
219 std::vector<G4double> fLPMFuncPhi; <<
220 }; <<
221 // <<
222 static std::shared_ptr<LPMFuncs> gLPMFuncs() <<
223 static std::shared_ptr<std::vector<ElementDa <<
224 std::shared_ptr<LPMFuncs> fLPMFuncs; <<
225 std::shared_ptr<std::vector<ElementData*>> f <<
226 }; <<
227 274
228 #endif 275 #endif
229 276