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27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // 29 //
30 // GEANT4 Class header file 30 // GEANT4 Class header file
31 // 31 //
32 // 32 //
33 // File name: G4UrbanMscModel 33 // File name: G4UrbanMscModel
34 // 34 //
35 // Author: Laszlo Urban 35 // Author: Laszlo Urban
36 // 36 //
37 // Creation date: 19.02.2013 37 // Creation date: 19.02.2013
38 // 38 //
39 // Created from G4UrbanMscModel96 39 // Created from G4UrbanMscModel96
40 // 40 //
41 // New parametrization for theta0 41 // New parametrization for theta0
42 // Correction for very small step length 42 // Correction for very small step length
43 // 43 //
44 // Class Description: 44 // Class Description:
45 // 45 //
46 // Implementation of the model of multiple sca 46 // Implementation of the model of multiple scattering based on
47 // H.W.Lewis Phys Rev 78 (1950) 526 and L.Urba 47 // H.W.Lewis Phys Rev 78 (1950) 526 and L.Urban model
48 48
49 // ------------------------------------------- 49 // -------------------------------------------------------------------
50 // 50 //
51 51
52 #ifndef G4UrbanMscModel_h 52 #ifndef G4UrbanMscModel_h
53 #define G4UrbanMscModel_h 1 53 #define G4UrbanMscModel_h 1
54 54
55 //....oooOO0OOooo........oooOO0OOooo........oo 55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56 56
57 #include <CLHEP/Units/SystemOfUnits.h> 57 #include <CLHEP/Units/SystemOfUnits.h>
58 58
59 #include "G4VMscModel.hh" 59 #include "G4VMscModel.hh"
60 #include "G4MscStepLimitType.hh" 60 #include "G4MscStepLimitType.hh"
61 #include "G4Log.hh" 61 #include "G4Log.hh"
62 #include "G4Exp.hh" 62 #include "G4Exp.hh"
63 63
64 class G4ParticleChangeForMSC; 64 class G4ParticleChangeForMSC;
65 class G4SafetyHelper; 65 class G4SafetyHelper;
66 66
67 //....oooOO0OOooo........oooOO0OOooo........oo 67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
68 68
69 class G4UrbanMscModel : public G4VMscModel 69 class G4UrbanMscModel : public G4VMscModel
70 { 70 {
71 71
72 public: 72 public:
73 73
74 explicit G4UrbanMscModel(const G4String& nam 74 explicit G4UrbanMscModel(const G4String& nam = "UrbanMsc");
75 75
76 ~G4UrbanMscModel() override; 76 ~G4UrbanMscModel() override;
77 77
78 void Initialise(const G4ParticleDefinition*, 78 void Initialise(const G4ParticleDefinition*,
79 const G4DataVector&) override; 79 const G4DataVector&) override;
80 80
81 void StartTracking(G4Track*) override; 81 void StartTracking(G4Track*) override;
82 82
83 G4double 83 G4double
84 ComputeCrossSectionPerAtom(const G4ParticleD 84 ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
85 G4double KineticEnergy, 85 G4double KineticEnergy,
86 G4double AtomicNumber, 86 G4double AtomicNumber,
87 G4double AtomicWeight=0., 87 G4double AtomicWeight=0.,
88 G4double cut =0., 88 G4double cut =0.,
89 G4double emax=DBL_MAX) override; 89 G4double emax=DBL_MAX) override;
90 90
91 G4ThreeVector& SampleScattering(const G4Thre 91 G4ThreeVector& SampleScattering(const G4ThreeVector&,
92 G4double safety) override; 92 G4double safety) override;
93 93
94 G4double ComputeTruePathLengthLimit(const G4 94 G4double ComputeTruePathLengthLimit(const G4Track& track,
95 G4double& currentMinimalSt 95 G4double& currentMinimalStep) override;
96 96
97 G4double ComputeGeomPathLength(G4double true 97 G4double ComputeGeomPathLength(G4double truePathLength) override;
98 98
99 G4double ComputeTrueStepLength(G4double geom 99 G4double ComputeTrueStepLength(G4double geomStepLength) override;
100 100
101 G4double ComputeTheta0(G4double truePathLeng 101 G4double ComputeTheta0(G4double truePathLength, G4double KineticEnergy);
102 102
103 inline void SetDisplacementAlgorithm96(const 103 inline void SetDisplacementAlgorithm96(const G4bool val);
104 104
105 inline void SetPositronCorrection(const G4bo 105 inline void SetPositronCorrection(const G4bool val);
106 106
107 // hide assignment operator 107 // hide assignment operator
108 G4UrbanMscModel & operator=(const G4UrbanMs 108 G4UrbanMscModel & operator=(const G4UrbanMscModel &right) = delete;
109 G4UrbanMscModel(const G4UrbanMscModel&) = d 109 G4UrbanMscModel(const G4UrbanMscModel&) = delete;
110 110
111 private: 111 private:
112 112
113 G4double SampleCosineTheta(G4double trueStep 113 G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
114 114
115 void SampleDisplacement(G4double sinTheta, G 115 void SampleDisplacement(G4double sinTheta, G4double phi);
116 116
117 void SampleDisplacementNew(G4double sinTheta 117 void SampleDisplacementNew(G4double sinTheta, G4double phi);
118 118
119 void InitialiseModelCache(); 119 void InitialiseModelCache();
120 120
121 inline void SetParticle(const G4ParticleDefi 121 inline void SetParticle(const G4ParticleDefinition*);
122 122
123 inline G4double Randomizetlimit(); 123 inline G4double Randomizetlimit();
124 124
125 inline G4double SimpleScattering(); 125 inline G4double SimpleScattering();
126 126
127 inline G4double ComputeStepmin(); 127 inline G4double ComputeStepmin();
128 128
129 inline G4double ComputeTlimitmin(); 129 inline G4double ComputeTlimitmin();
130 130
131 CLHEP::HepRandomEngine* rndmEngineMod; 131 CLHEP::HepRandomEngine* rndmEngineMod;
132 132
133 const G4ParticleDefinition* particle = nullp 133 const G4ParticleDefinition* particle = nullptr;
134 const G4ParticleDefinition* positron; 134 const G4ParticleDefinition* positron;
135 G4ParticleChangeForMSC* fParticleChange = nu 135 G4ParticleChangeForMSC* fParticleChange = nullptr;
136 const G4MaterialCutsCouple* couple = nullptr 136 const G4MaterialCutsCouple* couple = nullptr;
137 137
138 G4double mass; 138 G4double mass;
139 G4double charge,chargeSquare; 139 G4double charge,chargeSquare;
140 G4double masslimite,fr; 140 G4double masslimite,fr;
141 141
142 G4double taubig; 142 G4double taubig;
143 G4double tausmall; 143 G4double tausmall;
144 G4double taulim; 144 G4double taulim;
145 G4double currentTau; 145 G4double currentTau;
146 G4double tlimit; 146 G4double tlimit;
147 G4double tlimitmin; 147 G4double tlimitmin;
148 G4double tlimitminfix,tlimitminfix2; 148 G4double tlimitminfix,tlimitminfix2;
149 G4double tgeom; 149 G4double tgeom;
150 150
151 G4double geombig; 151 G4double geombig;
152 G4double geommin; 152 G4double geommin;
153 G4double geomlimit; 153 G4double geomlimit;
154 G4double skindepth; 154 G4double skindepth;
155 G4double smallstep; 155 G4double smallstep;
156 156
157 G4double presafety; 157 G4double presafety;
158 158
159 G4double lambda0; 159 G4double lambda0;
160 G4double lambdaeff; 160 G4double lambdaeff;
161 G4double tPathLength; 161 G4double tPathLength;
162 G4double zPathLength; 162 G4double zPathLength;
163 G4double par1,par2,par3; 163 G4double par1,par2,par3;
164 164
165 G4double stepmin; 165 G4double stepmin;
166 166
167 G4double currentKinEnergy; 167 G4double currentKinEnergy;
168 G4double currentLogKinEnergy; 168 G4double currentLogKinEnergy;
169 G4double currentRange; 169 G4double currentRange;
170 G4double rangeinit; 170 G4double rangeinit;
171 G4double currentRadLength; 171 G4double currentRadLength;
172 172
173 G4double drr,finalr; 173 G4double drr,finalr;
174 174
175 G4double tlow; 175 G4double tlow;
176 G4double invmev; 176 G4double invmev;
177 G4double xmeanth = 0.0; 177 G4double xmeanth = 0.0;
178 G4double x2meanth = 1./3.; 178 G4double x2meanth = 1./3.;
179 G4double rndmarray[2]; 179 G4double rndmarray[2];
180 180
181 struct mscData { 181 struct mscData {
182 G4double Z23, sqrtZ, factmin; 182 G4double Z23, sqrtZ, factmin;
183 G4double coeffth1, coeffth2; 183 G4double coeffth1, coeffth2;
184 G4double coeffc1, coeffc2, coeffc3, coeffc 184 G4double coeffc1, coeffc2, coeffc3, coeffc4;
185 G4double stepmina, stepminb; 185 G4double stepmina, stepminb;
186 G4double doverra, doverrb; 186 G4double doverra, doverrb;
187 G4double posa, posb, posc, posd, pose; 187 G4double posa, posb, posc, posd, pose;
188 }; 188 };
189 static std::vector<mscData*> msc; 189 static std::vector<mscData*> msc;
190 190
191 // index of G4MaterialCutsCouple 191 // index of G4MaterialCutsCouple
192 G4int idx = 0; 192 G4int idx = 0;
193 193
194 G4bool firstStep = true; 194 G4bool firstStep = true;
195 G4bool insideskin = false; 195 G4bool insideskin = false;
196 196
197 G4bool latDisplasmentbackup = false; 197 G4bool latDisplasmentbackup = false;
198 G4bool dispAlg96 = true; 198 G4bool dispAlg96 = true;
199 G4bool fPosiCorrection = true; 199 G4bool fPosiCorrection = true;
200 G4bool isFirstInstance = false; 200 G4bool isFirstInstance = false;
201 }; 201 };
202 202
203 //....oooOO0OOooo........oooOO0OOooo........oo 203 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
204 //....oooOO0OOooo........oooOO0OOooo........oo 204 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
205 205
206 inline 206 inline
207 void G4UrbanMscModel::SetParticle(const G4Part 207 void G4UrbanMscModel::SetParticle(const G4ParticleDefinition* p)
208 { 208 {
209 if (p != particle) { 209 if (p != particle) {
210 particle = p; 210 particle = p;
211 mass = p->GetPDGMass(); 211 mass = p->GetPDGMass();
212 charge = p->GetPDGCharge()/CLHEP::eplus; 212 charge = p->GetPDGCharge()/CLHEP::eplus;
213 chargeSquare = charge*charge; 213 chargeSquare = charge*charge;
214 } 214 }
215 } 215 }
216 216
217 //....oooOO0OOooo........oooOO0OOooo........oo 217 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
218 218
219 inline G4double G4UrbanMscModel::Randomizetlim 219 inline G4double G4UrbanMscModel::Randomizetlimit()
220 { 220 {
221 G4double res = tlimitmin; 221 G4double res = tlimitmin;
222 if(tlimit > tlimitmin) 222 if(tlimit > tlimitmin)
223 { 223 {
224 res = G4RandGauss::shoot(rndmEngineMod,tli 224 res = G4RandGauss::shoot(rndmEngineMod,tlimit,0.1*(tlimit-tlimitmin));
225 res = std::max(res, tlimitmin); 225 res = std::max(res, tlimitmin);
226 } 226 }
227 return res; 227 return res;
228 } 228 }
229 229
230 //....oooOO0OOooo........oooOO0OOooo........oo 230 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
231 231
232 inline G4double G4UrbanMscModel::SimpleScatter 232 inline G4double G4UrbanMscModel::SimpleScattering()
233 { 233 {
234 // 'large angle scattering' 234 // 'large angle scattering'
235 // 2 model functions with correct xmean and 235 // 2 model functions with correct xmean and x2mean
236 const G4double a = (2.*xmeanth+9.*x2meanth-3 236 const G4double a = (2.*xmeanth+9.*x2meanth-3.)/(2.*xmeanth-3.*x2meanth+1.);
237 const G4double prob = (a+2.)*xmeanth/a; 237 const G4double prob = (a+2.)*xmeanth/a;
238 238
239 // sampling 239 // sampling
240 rndmEngineMod->flatArray(2, rndmarray); 240 rndmEngineMod->flatArray(2, rndmarray);
241 return (rndmarray[1] < prob) ? 241 return (rndmarray[1] < prob) ?
242 -1.+2.*G4Exp(G4Log(rndmarray[0])/(a+1.)) : 242 -1.+2.*G4Exp(G4Log(rndmarray[0])/(a+1.)) : -1.+2.*rndmarray[0];
243 } 243 }
244 244
245 //....oooOO0OOooo........oooOO0OOooo........oo 245 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
246 246
247 inline G4double G4UrbanMscModel::ComputeStepmi 247 inline G4double G4UrbanMscModel::ComputeStepmin()
248 { 248 {
249 // define stepmin using estimation of the ra 249 // define stepmin using estimation of the ratio
250 // of lambda_elastic/lambda_transport 250 // of lambda_elastic/lambda_transport
251 const G4double rat = currentKinEnergy*invmev 251 const G4double rat = currentKinEnergy*invmev;
252 return lambda0*msc[idx]->factmin/ 252 return lambda0*msc[idx]->factmin/
253 (0.002 + rat*(msc[idx]->stepmina + msc[idx 253 (0.002 + rat*(msc[idx]->stepmina + msc[idx]->stepminb*rat));
254 } 254 }
255 255
256 //....oooOO0OOooo........oooOO0OOooo........oo 256 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
257 257
258 inline G4double G4UrbanMscModel::ComputeTlimit 258 inline G4double G4UrbanMscModel::ComputeTlimitmin()
259 { 259 {
260 G4double x = (particle == positron) ? 260 G4double x = (particle == positron) ?
261 0.7*msc[idx]->sqrtZ*stepmin : 0.87*msc[idx 261 0.7*msc[idx]->sqrtZ*stepmin : 0.87*msc[idx]->Z23*stepmin;
262 if(currentKinEnergy < tlow) { x *= 0.5*(1.+c 262 if(currentKinEnergy < tlow) { x *= 0.5*(1.+currentKinEnergy/tlow); }
263 return std::max(x, tlimitminfix); 263 return std::max(x, tlimitminfix);
264 } 264 }
265 265
266 //....oooOO0OOooo........oooOO0OOooo........oo 266 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
267 267
268 inline void G4UrbanMscModel::SetDisplacementAl 268 inline void G4UrbanMscModel::SetDisplacementAlgorithm96(const G4bool val)
269 { 269 {
270 dispAlg96 = val; 270 dispAlg96 = val;
271 } 271 }
272 272
273 //....oooOO0OOooo........oooOO0OOooo........oo 273 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
274 274
275 inline void G4UrbanMscModel::SetPositronCorrec 275 inline void G4UrbanMscModel::SetPositronCorrection(const G4bool val)
276 { 276 {
277 fPosiCorrection = val; 277 fPosiCorrection = val;
278 } 278 }
279 279
280 //....oooOO0OOooo........oooOO0OOooo........oo 280 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
281 281
282 #endif 282 #endif
283 283
284 284