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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 class G4LossTableManager;
66 67
67 //....oooOO0OOooo........oooOO0OOooo........oo 68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
68 69
69 class G4UrbanMscModel : public G4VMscModel 70 class G4UrbanMscModel : public G4VMscModel
70 { 71 {
71 72
72 public: 73 public:
73 74
74 explicit G4UrbanMscModel(const G4String& nam 75 explicit G4UrbanMscModel(const G4String& nam = "UrbanMsc");
75 76
76 ~G4UrbanMscModel() override; 77 ~G4UrbanMscModel() override;
77 78
78 void Initialise(const G4ParticleDefinition*, 79 void Initialise(const G4ParticleDefinition*,
79 const G4DataVector&) override; 80 const G4DataVector&) override;
80 81
81 void StartTracking(G4Track*) override; 82 void StartTracking(G4Track*) override;
82 83
83 G4double 84 G4double
84 ComputeCrossSectionPerAtom(const G4ParticleD 85 ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
85 G4double KineticEnergy, 86 G4double KineticEnergy,
86 G4double AtomicNumber, 87 G4double AtomicNumber,
87 G4double AtomicWeight=0., 88 G4double AtomicWeight=0.,
88 G4double cut =0., 89 G4double cut =0.,
89 G4double emax=DBL_MAX) override; 90 G4double emax=DBL_MAX) override;
90 91
91 G4ThreeVector& SampleScattering(const G4Thre 92 G4ThreeVector& SampleScattering(const G4ThreeVector&,
92 G4double safety) override; 93 G4double safety) override;
93 94
94 G4double ComputeTruePathLengthLimit(const G4 95 G4double ComputeTruePathLengthLimit(const G4Track& track,
95 G4double& currentMinimalSt 96 G4double& currentMinimalStep) override;
96 97
97 G4double ComputeGeomPathLength(G4double true 98 G4double ComputeGeomPathLength(G4double truePathLength) override;
98 99
99 G4double ComputeTrueStepLength(G4double geom 100 G4double ComputeTrueStepLength(G4double geomStepLength) override;
100 101
101 G4double ComputeTheta0(G4double truePathLeng 102 G4double ComputeTheta0(G4double truePathLength, G4double KineticEnergy);
102 103
103 inline void SetDisplacementAlgorithm96(const <<
104 <<
105 inline void SetPositronCorrection(const G4bo <<
106 <<
107 // hide assignment operator 104 // hide assignment operator
108 G4UrbanMscModel & operator=(const G4UrbanMs 105 G4UrbanMscModel & operator=(const G4UrbanMscModel &right) = delete;
109 G4UrbanMscModel(const G4UrbanMscModel&) = d 106 G4UrbanMscModel(const G4UrbanMscModel&) = delete;
110 107
111 private: 108 private:
112 109
113 G4double SampleCosineTheta(G4double trueStep 110 G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
114 111
115 void SampleDisplacement(G4double sinTheta, G 112 void SampleDisplacement(G4double sinTheta, G4double phi);
116 113
117 void SampleDisplacementNew(G4double sinTheta 114 void SampleDisplacementNew(G4double sinTheta, G4double phi);
118 115
119 void InitialiseModelCache(); 116 void InitialiseModelCache();
120 117
121 inline void SetParticle(const G4ParticleDefi 118 inline void SetParticle(const G4ParticleDefinition*);
122 119
123 inline G4double Randomizetlimit(); 120 inline G4double Randomizetlimit();
124 121
125 inline G4double SimpleScattering(); << 122 inline G4double SimpleScattering(G4double xmeanth, G4double x2meanth);
126 123
127 inline G4double ComputeStepmin(); 124 inline G4double ComputeStepmin();
128 125
129 inline G4double ComputeTlimitmin(); 126 inline G4double ComputeTlimitmin();
130 127
131 CLHEP::HepRandomEngine* rndmEngineMod; << 128 CLHEP::HepRandomEngine* rndmEngineMod;
132 129
133 const G4ParticleDefinition* particle = nullp << 130 const G4ParticleDefinition* particle;
134 const G4ParticleDefinition* positron; 131 const G4ParticleDefinition* positron;
135 G4ParticleChangeForMSC* fParticleChange = nu << 132 G4ParticleChangeForMSC* fParticleChange;
136 const G4MaterialCutsCouple* couple = nullptr << 133
>> 134 const G4MaterialCutsCouple* couple;
>> 135 G4LossTableManager* theManager;
137 136
138 G4double mass; 137 G4double mass;
139 G4double charge,chargeSquare; << 138 G4double charge,ChargeSquare;
140 G4double masslimite,fr; 139 G4double masslimite,fr;
141 140
142 G4double taubig; 141 G4double taubig;
143 G4double tausmall; 142 G4double tausmall;
144 G4double taulim; 143 G4double taulim;
145 G4double currentTau; 144 G4double currentTau;
146 G4double tlimit; 145 G4double tlimit;
147 G4double tlimitmin; 146 G4double tlimitmin;
148 G4double tlimitminfix,tlimitminfix2; 147 G4double tlimitminfix,tlimitminfix2;
149 G4double tgeom; 148 G4double tgeom;
150 149
151 G4double geombig; 150 G4double geombig;
152 G4double geommin; 151 G4double geommin;
153 G4double geomlimit; 152 G4double geomlimit;
154 G4double skindepth; 153 G4double skindepth;
155 G4double smallstep; 154 G4double smallstep;
156 155
157 G4double presafety; 156 G4double presafety;
158 157
159 G4double lambda0; 158 G4double lambda0;
160 G4double lambdaeff; 159 G4double lambdaeff;
161 G4double tPathLength; 160 G4double tPathLength;
162 G4double zPathLength; 161 G4double zPathLength;
163 G4double par1,par2,par3; 162 G4double par1,par2,par3;
164 163
165 G4double stepmin; 164 G4double stepmin;
166 165
167 G4double currentKinEnergy; 166 G4double currentKinEnergy;
168 G4double currentLogKinEnergy; 167 G4double currentLogKinEnergy;
169 G4double currentRange; 168 G4double currentRange;
170 G4double rangeinit; 169 G4double rangeinit;
171 G4double currentRadLength; 170 G4double currentRadLength;
172 171
>> 172 G4double rangecut;
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; <<
178 G4double x2meanth = 1./3.; <<
179 G4double rndmarray[2]; <<
180 177
181 struct mscData { 178 struct mscData {
182 G4double Z23, sqrtZ, factmin; << 179 G4double ecut, Zeff, Z23, sqrtZ;
183 G4double coeffth1, coeffth2; 180 G4double coeffth1, coeffth2;
184 G4double coeffc1, coeffc2, coeffc3, coeffc 181 G4double coeffc1, coeffc2, coeffc3, coeffc4;
185 G4double stepmina, stepminb; 182 G4double stepmina, stepminb;
186 G4double doverra, doverrb; 183 G4double doverra, doverrb;
187 G4double posa, posb, posc, posd, pose; <<
188 }; 184 };
189 static std::vector<mscData*> msc; 185 static std::vector<mscData*> msc;
190 186
191 // index of G4MaterialCutsCouple 187 // index of G4MaterialCutsCouple
192 G4int idx = 0; << 188 G4int idx;
193 189
194 G4bool firstStep = true; << 190 G4bool firstStep;
195 G4bool insideskin = false; << 191 G4bool insideskin;
>> 192
>> 193 G4bool latDisplasmentbackup;
>> 194 G4bool dispAlg96;
196 195
197 G4bool latDisplasmentbackup = false; <<
198 G4bool dispAlg96 = true; <<
199 G4bool fPosiCorrection = true; <<
200 G4bool isFirstInstance = false; <<
201 }; 196 };
202 197
203 //....oooOO0OOooo........oooOO0OOooo........oo 198 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
204 //....oooOO0OOooo........oooOO0OOooo........oo 199 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
205 200
206 inline 201 inline
207 void G4UrbanMscModel::SetParticle(const G4Part 202 void G4UrbanMscModel::SetParticle(const G4ParticleDefinition* p)
208 { 203 {
209 if (p != particle) { 204 if (p != particle) {
210 particle = p; 205 particle = p;
211 mass = p->GetPDGMass(); 206 mass = p->GetPDGMass();
212 charge = p->GetPDGCharge()/CLHEP::eplus; 207 charge = p->GetPDGCharge()/CLHEP::eplus;
213 chargeSquare = charge*charge; << 208 ChargeSquare = charge*charge;
214 } 209 }
215 } 210 }
216 211
217 //....oooOO0OOooo........oooOO0OOooo........oo 212 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
218 213
219 inline G4double G4UrbanMscModel::Randomizetlim 214 inline G4double G4UrbanMscModel::Randomizetlimit()
220 { 215 {
221 G4double res = tlimitmin; 216 G4double res = tlimitmin;
222 if(tlimit > tlimitmin) 217 if(tlimit > tlimitmin)
223 { 218 {
224 res = G4RandGauss::shoot(rndmEngineMod,tli 219 res = G4RandGauss::shoot(rndmEngineMod,tlimit,0.1*(tlimit-tlimitmin));
225 res = std::max(res, tlimitmin); 220 res = std::max(res, tlimitmin);
226 } 221 }
227 return res; 222 return res;
228 } 223 }
229 224
230 //....oooOO0OOooo........oooOO0OOooo........oo 225 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
231 226
232 inline G4double G4UrbanMscModel::SimpleScatter << 227 inline
>> 228 G4double G4UrbanMscModel::SimpleScattering(G4double xmeanth, G4double x2meanth)
233 { 229 {
234 // 'large angle scattering' 230 // 'large angle scattering'
235 // 2 model functions with correct xmean and 231 // 2 model functions with correct xmean and x2mean
236 const G4double a = (2.*xmeanth+9.*x2meanth-3 << 232 G4double a = (2.*xmeanth+9.*x2meanth-3.)/(2.*xmeanth-3.*x2meanth+1.);
237 const G4double prob = (a+2.)*xmeanth/a; << 233 G4double prob = (a+2.)*xmeanth/a;
238 234
239 // sampling 235 // sampling
240 rndmEngineMod->flatArray(2, rndmarray); << 236 G4double rdm = rndmEngineMod->flat();
241 return (rndmarray[1] < prob) ? << 237 G4double cth = (rndmEngineMod->flat() < prob)
242 -1.+2.*G4Exp(G4Log(rndmarray[0])/(a+1.)) : << 238 ? -1.+2.*G4Exp(G4Log(rdm)/(a+1.)) : -1.+2.*rdm;
>> 239 return cth;
243 } 240 }
244 241
245 //....oooOO0OOooo........oooOO0OOooo........oo <<
246 <<
247 inline G4double G4UrbanMscModel::ComputeStepmi 242 inline G4double G4UrbanMscModel::ComputeStepmin()
248 { 243 {
249 // define stepmin using estimation of the ra 244 // define stepmin using estimation of the ratio
250 // of lambda_elastic/lambda_transport 245 // of lambda_elastic/lambda_transport
251 const G4double rat = currentKinEnergy*invmev << 246 G4double rat = currentKinEnergy*invmev;
252 return lambda0*msc[idx]->factmin/ << 247 return lambda0*1.e-3/(2.e-3+rat*(msc[idx]->stepmina+msc[idx]->stepminb*rat));
253 (0.002 + rat*(msc[idx]->stepmina + msc[idx <<
254 } 248 }
255 249
256 //....oooOO0OOooo........oooOO0OOooo........oo <<
257 <<
258 inline G4double G4UrbanMscModel::ComputeTlimit 250 inline G4double G4UrbanMscModel::ComputeTlimitmin()
259 { 251 {
260 G4double x = (particle == positron) ? 252 G4double x = (particle == positron) ?
261 0.7*msc[idx]->sqrtZ*stepmin : 0.87*msc[idx 253 0.7*msc[idx]->sqrtZ*stepmin : 0.87*msc[idx]->Z23*stepmin;
262 if(currentKinEnergy < tlow) { x *= 0.5*(1.+c 254 if(currentKinEnergy < tlow) { x *= 0.5*(1.+currentKinEnergy/tlow); }
263 return std::max(x, tlimitminfix); 255 return std::max(x, tlimitminfix);
264 } 256 }
265 257
266 //....oooOO0OOooo........oooOO0OOooo........oo 258 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
267 259
268 inline void G4UrbanMscModel::SetDisplacementAl <<
269 { <<
270 dispAlg96 = val; <<
271 } <<
272 <<
273 //....oooOO0OOooo........oooOO0OOooo........oo <<
274 <<
275 inline void G4UrbanMscModel::SetPositronCorrec <<
276 { <<
277 fPosiCorrection = val; <<
278 } <<
279 <<
280 //....oooOO0OOooo........oooOO0OOooo........oo <<
281 260
282 #endif 261 #endif
283 262
284 263