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25 // 25 //
>> 26 // $Id: G4eBremsstrahlungRelModel.hh,v 1.10 2008/11/14 09:25:19 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-02-patch-04 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class header file 31 // GEANT4 Class header file
30 // 32 //
31 // 33 //
32 // File name: G4eBremsstrahlungRelModel 34 // File name: G4eBremsstrahlungRelModel
33 // extention of standard G4eBre 35 // extention of standard G4eBremsstrahlungModel
34 // 36 //
35 // Author: Andreas Schaelicke << 37 // Author: Andreas Schaelicke
36 // 38 //
37 // Creation date: 28.03.2008 39 // Creation date: 28.03.2008
38 // 40 //
39 // Modifications: 41 // Modifications:
40 // 42 //
41 // 15.07.18 introduced data structures to sto <<
42 // dent data for faster run-time com <<
43 // 43 //
44 // Class Description: 44 // Class Description:
45 // 45 //
46 // Implementation of energy loss for gamma emi 46 // Implementation of energy loss for gamma emission by electrons and
47 // positrons including an improved version of 47 // positrons including an improved version of the LPM effect
48 48
49 // ------------------------------------------- 49 // -------------------------------------------------------------------
50 // 50 //
51 51
52 #ifndef G4eBremsstrahlungRelModel_h 52 #ifndef G4eBremsstrahlungRelModel_h
53 #define G4eBremsstrahlungRelModel_h 1 53 #define G4eBremsstrahlungRelModel_h 1
54 54
55 #include "G4VEmModel.hh" 55 #include "G4VEmModel.hh"
56 #include <memory> << 56 #include "G4NistManager.hh"
57 57
58 class G4ParticleChangeForLoss; 58 class G4ParticleChangeForLoss;
>> 59 class G4PhysicsVector;
59 60
60 class G4eBremsstrahlungRelModel : public G4VEm << 61 class G4eBremsstrahlungRelModel : public G4VEmModel
>> 62 {
61 63
62 public: 64 public:
63 65
64 explicit G4eBremsstrahlungRelModel(const G4P << 66 G4eBremsstrahlungRelModel(const G4ParticleDefinition* p = 0,
65 const G4S << 67 const G4String& nam = "eBremRel");
66 68
67 ~G4eBremsstrahlungRelModel() override; << 69 virtual ~G4eBremsstrahlungRelModel();
68 70
69 void Initialise(const G4ParticleDefinition*, << 71 virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
70 72
71 void InitialiseLocal(const G4ParticleDefinit << 73 G4double MinEnergyCut(const G4ParticleDefinition*,
72 G4VEmModel* masterModel << 74 const G4MaterialCutsCouple*);
73 << 75
74 G4double ComputeDEDXPerVolume(const G4Materi << 76 virtual G4double ComputeDEDXPerVolume(const G4Material*,
75 const G4Partic << 77 const G4ParticleDefinition*,
76 G4double ekin, << 78 G4double kineticEnergy,
77 G4double cutEn << 79 G4double cutEnergy);
78 << 80
79 G4double ComputeCrossSectionPerAtom(const G4 << 81 virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
80 G4double << 82 G4double tkin,
81 G4double << 83 G4double Z, G4double,
82 G4double << 84 G4double cutEnergy,
83 G4double << 85 G4double maxEnergy = DBL_MAX);
84 G4double << 86
85 << 87 virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
86 void SampleSecondaries(std::vector<G4Dynamic << 88 const G4MaterialCutsCouple*,
87 const G4MaterialCutsC << 89 const G4DynamicParticle*,
88 const G4DynamicPartic << 90 G4double cutEnergy,
89 G4double cutEnergy, << 91 G4double maxEnergy);
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 92
99 protected: << 93 virtual void SetupForMaterial(const G4ParticleDefinition*,
>> 94 const G4Material*,G4double);
100 95
101 virtual G4double ComputeDXSectionPerAtom(G4d << 96 inline void SetLPMconstant(G4double val);
>> 97 inline G4double LPMconstant() const;
102 98
103 void SetParticle(const G4ParticleDefinition* << 99 protected:
>> 100
>> 101 inline G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
>> 102 G4double kineticEnergy);
104 103
105 private: 104 private:
106 105
>> 106 void InitialiseConstants();
>> 107
>> 108 void CalcLPMFunctions(G4double gammaEnergy);
>> 109
107 G4double ComputeBremLoss(G4double cutEnergy) 110 G4double ComputeBremLoss(G4double cutEnergy);
108 111
109 G4double ComputeXSectionPerAtom(G4double cut 112 G4double ComputeXSectionPerAtom(G4double cutEnergy);
110 113
>> 114 G4double ComputeDXSectionPerAtom(G4double gammaEnergy);
>> 115
111 G4double ComputeRelDXSectionPerAtom(G4double 116 G4double ComputeRelDXSectionPerAtom(G4double gammaEnergy);
112 117
113 // init special data per element i.e. per Z << 118 void SetParticle(const G4ParticleDefinition* p);
114 void InitialiseElementData(); <<
115 119
116 // methods for initialisation and run-time e << 120 // * fast inline functions *
117 void InitLPMFunctions(); << 121 inline void SetCurrentElement(const G4double);
118 122
119 void ComputeLPMfunctions(G4double& funcXiS, << 123 inline G4double Phi1(G4double,G4double);
120 G4double& funcGS, << 124 inline G4double Phi1M2(G4double,G4double);
121 G4double& funcPhiS, << 125 inline G4double Psi1(G4double,G4double);
122 const G4double egam << 126 inline G4double Psi1M2(G4double,G4double);
123 << 127
124 void GetLPMFunctions(G4double& lpmGs, << 128 // hide assignment operator
125 G4double& lpmPhis, << 129 G4eBremsstrahlungRelModel & operator=(const G4eBremsstrahlungRelModel &right);
126 const G4double ss); << 130 G4eBremsstrahlungRelModel(const G4eBremsstrahlungRelModel&);
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 <<
143 131
144 private: << 132 protected:
145 133
146 G4bool fIsUseCompleteSc << 134 G4NistManager* nist;
147 G4bool fIsInitializer = << 135 const G4ParticleDefinition* particle;
148 G4bool fUseLPM = true; << 136 G4ParticleDefinition* theGamma;
>> 137 G4ParticleChangeForLoss* fParticleChange;
>> 138
>> 139 static const G4double xgi[8], wgi[8];
>> 140 static const G4double Fel_light[5];
>> 141 static const G4double Finel_light[5];
149 142
150 protected: << 143 G4double minThreshold;
151 144
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 145 // cash
161 G4double fPrimaryParticle << 146 G4double particleMass;
162 G4double fPrimaryKinEnerg << 147 G4double kinEnergy;
163 G4double fPrimaryTotalEne << 148 G4double totalEnergy;
164 G4double fDensityFactor = << 149 G4double currentZ;
165 G4double fDensityCorr = 0 << 150 G4double z13, z23, lnZ;
166 G4double fLowestKinEnergy << 151 G4double Fel, Finel, fCoulomb, fMax;
167 // scattering off electrons << 152 G4double densityFactor;
168 G4double fNucTerm = 0.; << 153 G4double densityCorr;
169 G4double fSumTerm = 0.; << 154
>> 155 // LPM effect
>> 156 G4double lpmEnergy;
>> 157 G4PhysicsVector *fXiLPM, *fPhiLPM, *fGLPM;
>> 158 G4double xiLPM, phiLPM, gLPM;
>> 159
>> 160 // critical gamma energies
>> 161 G4double klpm, kp;
>> 162
>> 163 G4bool isElectron;
170 164
171 private: 165 private:
>> 166 // consts
>> 167 G4double highKinEnergy;
>> 168 G4double lowKinEnergy;
>> 169 G4double fMigdalConstant;
>> 170 G4double fLPMconstant;
>> 171 G4double bremFactor;
>> 172 G4double energyThresholdLPM;
>> 173 G4double facFel, facFinel;
>> 174 G4double preS1,logTwo;
172 175
173 // LPM related members << 176 G4bool use_completescreening;
174 G4double fLPMEnergyThresh <<
175 G4double fLPMEnergy; <<
176 177
177 protected: << 178 G4bool isInitialised;
>> 179 };
178 180
179 static const G4double gBremFactor; << 181 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
180 static const G4double gMigdalConstant; <<
181 182
182 private: << 183 inline void G4eBremsstrahlungRelModel::SetCurrentElement(const G4double Z)
>> 184 {
>> 185 if(Z != currentZ) {
>> 186 currentZ = Z;
>> 187
>> 188 G4int iz = G4int(Z);
>> 189 z13 = nist->GetZ13(iz);
>> 190 z23 = z13*z13;
>> 191 lnZ = nist->GetLOGZ(iz);
>> 192
>> 193 if (iz <= 4) {
>> 194 Fel = Fel_light[iz];
>> 195 Finel = Finel_light[iz] ;
>> 196 }
>> 197 else {
>> 198 Fel = facFel - lnZ/3. ;
>> 199 Finel = facFinel - 2.*lnZ/3. ;
>> 200 }
>> 201
>> 202 fCoulomb=GetCurrentElement()->GetfCoulomb();
>> 203 fMax = Fel-fCoulomb + Finel/currentZ + (1.+1./currentZ)/12.;
>> 204 }
>> 205 }
>> 206
>> 207 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 208
>> 209 inline G4double
>> 210 G4eBremsstrahlungRelModel::MaxSecondaryEnergy(const G4ParticleDefinition*,
>> 211 G4double kineticEnergy)
>> 212 {
>> 213 return kineticEnergy;
>> 214 }
>> 215
>> 216 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 217
>> 218
>> 219 inline G4double G4eBremsstrahlungRelModel::Phi1(G4double gg, G4double)
>> 220 {
>> 221 // Thomas-Fermi FF from Tsai, eq.(3.38) for Z>=5
>> 222 return 20.863 - 2.*std::log(1. + sqr(0.55846*gg) )
>> 223 - 4.*( 1. - 0.6*std::exp(-0.9*gg) - 0.4*std::exp(-1.5*gg) );
>> 224 }
>> 225
>> 226 inline G4double G4eBremsstrahlungRelModel::Phi1M2(G4double gg, G4double)
>> 227 {
>> 228 // Thomas-Fermi FF from Tsai, eq. (3.39) for Z>=5
>> 229 // return Phi1(gg,Z) -
>> 230 return 2./(3.*(1. + 6.5*gg +6.*gg*gg) );
>> 231 }
>> 232
>> 233 inline G4double G4eBremsstrahlungRelModel::Psi1(G4double eps, G4double)
>> 234 {
>> 235 // Thomas-Fermi FF from Tsai, eq.(3.40) for Z>=5
>> 236 return 28.340 - 2.*std::log(1. + sqr(3.621*eps) )
>> 237 - 4.*( 1. - 0.7*std::exp(-8*eps) - 0.3*std::exp(-29.*eps) );
>> 238 }
>> 239
>> 240 inline G4double G4eBremsstrahlungRelModel::Psi1M2(G4double eps, G4double)
>> 241 {
>> 242 // Thomas-Fermi FF from Tsai, eq. (3.41) for Z>=5
>> 243 return 2./(3.*(1. + 40.*eps +400.*eps*eps) );
>> 244 }
>> 245
>> 246 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 247
>> 248 inline
>> 249 void G4eBremsstrahlungRelModel::SetLPMconstant(G4double val)
>> 250 {
>> 251 fLPMconstant = val;
>> 252 }
>> 253
>> 254 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 255
>> 256 inline
>> 257 G4double G4eBremsstrahlungRelModel::LPMconstant() const
>> 258 {
>> 259 return fLPMconstant;
>> 260 }
>> 261
>> 262 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
183 263
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 }; <<
227 264
228 #endif 265 #endif
229 266