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25 // 25 //
>> 26 // $Id: $
>> 27 // GEANT4 tag $Name: $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // 31 //
30 // GEANT4 Class header file 32 // GEANT4 Class header file
31 // 33 //
32 // 34 //
33 // File name: G4UrbanMscModel 35 // File name: G4UrbanMscModel
34 // 36 //
35 // Author: Laszlo Urban 37 // Author: Laszlo Urban
36 // 38 //
37 // Creation date: 19.02.2013 39 // Creation date: 19.02.2013
38 // 40 //
39 // Created from G4UrbanMscModel96 41 // Created from G4UrbanMscModel96
40 // 42 //
41 // New parametrization for theta0 43 // New parametrization for theta0
42 // Correction for very small step length 44 // Correction for very small step length
43 // 45 //
44 // Class Description: 46 // Class Description:
45 // 47 //
46 // Implementation of the model of multiple sca 48 // Implementation of the model of multiple scattering based on
47 // H.W.Lewis Phys Rev 78 (1950) 526 and L.Urba 49 // H.W.Lewis Phys Rev 78 (1950) 526 and L.Urban model
48 50
49 // ------------------------------------------- 51 // -------------------------------------------------------------------
50 // 52 //
51 53
52 #ifndef G4UrbanMscModel_h 54 #ifndef G4UrbanMscModel_h
53 #define G4UrbanMscModel_h 1 55 #define G4UrbanMscModel_h 1
54 56
55 //....oooOO0OOooo........oooOO0OOooo........oo 57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56 58
57 #include <CLHEP/Units/SystemOfUnits.h> 59 #include <CLHEP/Units/SystemOfUnits.h>
58 60
59 #include "G4VMscModel.hh" 61 #include "G4VMscModel.hh"
60 #include "G4MscStepLimitType.hh" 62 #include "G4MscStepLimitType.hh"
61 #include "G4Log.hh" 63 #include "G4Log.hh"
62 #include "G4Exp.hh" 64 #include "G4Exp.hh"
63 65
64 class G4ParticleChangeForMSC; 66 class G4ParticleChangeForMSC;
65 class G4SafetyHelper; 67 class G4SafetyHelper;
>> 68 class G4LossTableManager;
>> 69
>> 70 static const G4double c_highland = 13.6*CLHEP::MeV ;
66 71
67 //....oooOO0OOooo........oooOO0OOooo........oo 72 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
68 73
69 class G4UrbanMscModel : public G4VMscModel 74 class G4UrbanMscModel : public G4VMscModel
70 { 75 {
71 76
72 public: 77 public:
73 78
74 explicit G4UrbanMscModel(const G4String& nam << 79 G4UrbanMscModel(const G4String& nam = "UrbanMsc");
75 80
76 ~G4UrbanMscModel() override; << 81 virtual ~G4UrbanMscModel();
77 82
78 void Initialise(const G4ParticleDefinition*, << 83 void Initialise(const G4ParticleDefinition*, const G4DataVector&);
79 const G4DataVector&) override; <<
80 84
81 void StartTracking(G4Track*) override; << 85 void StartTracking(G4Track*);
82 86
83 G4double << 87 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
84 ComputeCrossSectionPerAtom(const G4ParticleD << 88 G4double KineticEnergy,
85 G4double KineticEnergy, << 89 G4double AtomicNumber,
86 G4double AtomicNumber, << 90 G4double AtomicWeight=0.,
87 G4double AtomicWeight=0., << 91 G4double cut =0.,
88 G4double cut =0., << 92 G4double emax=DBL_MAX);
89 G4double emax=DBL_MAX) override; <<
90 93
91 G4ThreeVector& SampleScattering(const G4Thre << 94 G4ThreeVector& SampleScattering(const G4ThreeVector&, G4double safety);
92 G4double safety) override; <<
93 95
94 G4double ComputeTruePathLengthLimit(const G4 96 G4double ComputeTruePathLengthLimit(const G4Track& track,
95 G4double& currentMinimalSt << 97 G4double& currentMinimalStep);
96 98
97 G4double ComputeGeomPathLength(G4double true << 99 G4double ComputeGeomPathLength(G4double truePathLength);
98 100
99 G4double ComputeTrueStepLength(G4double geom << 101 G4double ComputeTrueStepLength(G4double geomStepLength);
100 102
101 G4double ComputeTheta0(G4double truePathLeng 103 G4double ComputeTheta0(G4double truePathLength, G4double KineticEnergy);
102 104
103 inline void SetDisplacementAlgorithm96(const << 105 inline void SetNewDisplacementFlag(G4bool);
104 <<
105 inline void SetPositronCorrection(const G4bo <<
106 <<
107 // hide assignment operator <<
108 G4UrbanMscModel & operator=(const G4UrbanMs <<
109 G4UrbanMscModel(const G4UrbanMscModel&) = d <<
110 106
111 private: 107 private:
112 108
113 G4double SampleCosineTheta(G4double trueStep 109 G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
114 110
115 void SampleDisplacement(G4double sinTheta, G 111 void SampleDisplacement(G4double sinTheta, G4double phi);
116 112
117 void SampleDisplacementNew(G4double sinTheta 113 void SampleDisplacementNew(G4double sinTheta, G4double phi);
118 114
119 void InitialiseModelCache(); <<
120 <<
121 inline void SetParticle(const G4ParticleDefi 115 inline void SetParticle(const G4ParticleDefinition*);
122 116
>> 117 inline void UpdateCache();
>> 118
123 inline G4double Randomizetlimit(); 119 inline G4double Randomizetlimit();
124 120
125 inline G4double SimpleScattering(); << 121 inline G4double SimpleScattering(G4double xmeanth, G4double x2meanth);
126 122
127 inline G4double ComputeStepmin(); << 123 // hide assignment operator
128 << 124 G4UrbanMscModel & operator=(const G4UrbanMscModel &right);
129 inline G4double ComputeTlimitmin(); << 125 G4UrbanMscModel(const G4UrbanMscModel&);
130 126
131 CLHEP::HepRandomEngine* rndmEngineMod; << 127 CLHEP::HepRandomEngine* rndmEngineMod;
132 128
133 const G4ParticleDefinition* particle = nullp << 129 const G4ParticleDefinition* particle;
134 const G4ParticleDefinition* positron; 130 const G4ParticleDefinition* positron;
135 G4ParticleChangeForMSC* fParticleChange = nu << 131 G4ParticleChangeForMSC* fParticleChange;
136 const G4MaterialCutsCouple* couple = nullptr << 132
>> 133 const G4MaterialCutsCouple* couple;
>> 134 G4LossTableManager* theManager;
137 135
138 G4double mass; 136 G4double mass;
139 G4double charge,chargeSquare; << 137 G4double charge,ChargeSquare;
140 G4double masslimite,fr; << 138 G4double masslimite,lambdalimit,fr;
141 139
142 G4double taubig; 140 G4double taubig;
143 G4double tausmall; 141 G4double tausmall;
144 G4double taulim; 142 G4double taulim;
145 G4double currentTau; 143 G4double currentTau;
146 G4double tlimit; 144 G4double tlimit;
147 G4double tlimitmin; 145 G4double tlimitmin;
148 G4double tlimitminfix,tlimitminfix2; 146 G4double tlimitminfix,tlimitminfix2;
149 G4double tgeom; 147 G4double tgeom;
150 148
151 G4double geombig; 149 G4double geombig;
152 G4double geommin; 150 G4double geommin;
153 G4double geomlimit; 151 G4double geomlimit;
154 G4double skindepth; 152 G4double skindepth;
155 G4double smallstep; 153 G4double smallstep;
156 154
157 G4double presafety; 155 G4double presafety;
158 156
159 G4double lambda0; 157 G4double lambda0;
160 G4double lambdaeff; 158 G4double lambdaeff;
161 G4double tPathLength; 159 G4double tPathLength;
162 G4double zPathLength; 160 G4double zPathLength;
163 G4double par1,par2,par3; 161 G4double par1,par2,par3;
164 162
165 G4double stepmin; 163 G4double stepmin;
166 164
167 G4double currentKinEnergy; 165 G4double currentKinEnergy;
168 G4double currentLogKinEnergy; <<
169 G4double currentRange; 166 G4double currentRange;
170 G4double rangeinit; 167 G4double rangeinit;
171 G4double currentRadLength; 168 G4double currentRadLength;
172 169
>> 170 G4int currentMaterialIndex;
>> 171
>> 172 G4double Zold;
>> 173 G4double Zeff,Z2,Z23,lnZ;
>> 174 G4double coeffth1,coeffth2;
>> 175 G4double coeffc1,coeffc2,coeffc3,coeffc4;
>> 176
>> 177 G4bool firstStep;
>> 178 G4bool insideskin;
>> 179
>> 180 G4bool latDisplasmentbackup ;
>> 181 G4bool displacementFlag;
>> 182
>> 183 G4double rangecut;
173 G4double drr,finalr; 184 G4double drr,finalr;
174 185
175 G4double tlow; <<
176 G4double invmev; <<
177 G4double xmeanth = 0.0; <<
178 G4double x2meanth = 1./3.; <<
179 G4double rndmarray[2]; <<
180 <<
181 struct mscData { <<
182 G4double Z23, sqrtZ, factmin; <<
183 G4double coeffth1, coeffth2; <<
184 G4double coeffc1, coeffc2, coeffc3, coeffc <<
185 G4double stepmina, stepminb; <<
186 G4double doverra, doverrb; <<
187 G4double posa, posb, posc, posd, pose; <<
188 }; <<
189 static std::vector<mscData*> msc; <<
190 <<
191 // index of G4MaterialCutsCouple <<
192 G4int idx = 0; <<
193 <<
194 G4bool firstStep = true; <<
195 G4bool insideskin = false; <<
196 <<
197 G4bool latDisplasmentbackup = false; <<
198 G4bool dispAlg96 = true; <<
199 G4bool fPosiCorrection = true; <<
200 G4bool isFirstInstance = false; <<
201 }; 186 };
202 187
203 //....oooOO0OOooo........oooOO0OOooo........oo 188 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
204 //....oooOO0OOooo........oooOO0OOooo........oo 189 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
205 190
>> 191 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 192
>> 193 inline void G4UrbanMscModel::SetNewDisplacementFlag(G4bool val)
>> 194 {
>> 195 displacementFlag = val;
>> 196 }
>> 197
206 inline 198 inline
207 void G4UrbanMscModel::SetParticle(const G4Part 199 void G4UrbanMscModel::SetParticle(const G4ParticleDefinition* p)
208 { 200 {
209 if (p != particle) { 201 if (p != particle) {
210 particle = p; 202 particle = p;
211 mass = p->GetPDGMass(); 203 mass = p->GetPDGMass();
212 charge = p->GetPDGCharge()/CLHEP::eplus; 204 charge = p->GetPDGCharge()/CLHEP::eplus;
213 chargeSquare = charge*charge; << 205 ChargeSquare = charge*charge;
214 } 206 }
215 } 207 }
216 208
217 //....oooOO0OOooo........oooOO0OOooo........oo 209 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
218 << 210 inline
219 inline G4double G4UrbanMscModel::Randomizetlim << 211 G4double G4UrbanMscModel::Randomizetlimit()
220 { 212 {
221 G4double res = tlimitmin; << 213 G4double temptlimit = tlimit;
222 if(tlimit > tlimitmin) 214 if(tlimit > tlimitmin)
223 { 215 {
224 res = G4RandGauss::shoot(rndmEngineMod,tli << 216 do {
225 res = std::max(res, tlimitmin); << 217 temptlimit = G4RandGauss::shoot(rndmEngineMod,tlimit,0.3*tlimit);
>> 218 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
>> 219 } while ((temptlimit < tlimitmin) ||
>> 220 (temptlimit > 2.*tlimit-tlimitmin));
226 } 221 }
227 return res; << 222 else temptlimit = tlimitmin;
228 } <<
229 223
230 //....oooOO0OOooo........oooOO0OOooo........oo << 224 return temptlimit;
231 <<
232 inline G4double G4UrbanMscModel::SimpleScatter <<
233 { <<
234 // 'large angle scattering' <<
235 // 2 model functions with correct xmean and <<
236 const G4double a = (2.*xmeanth+9.*x2meanth-3 <<
237 const G4double prob = (a+2.)*xmeanth/a; <<
238 <<
239 // sampling <<
240 rndmEngineMod->flatArray(2, rndmarray); <<
241 return (rndmarray[1] < prob) ? <<
242 -1.+2.*G4Exp(G4Log(rndmarray[0])/(a+1.)) : <<
243 } 225 }
244 226
245 //....oooOO0OOooo........oooOO0OOooo........oo 227 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
246 << 228 inline
247 inline G4double G4UrbanMscModel::ComputeStepmi << 229 void G4UrbanMscModel::UpdateCache()
248 { 230 {
249 // define stepmin using estimation of the ra << 231 lnZ = G4Log(Zeff);
250 // of lambda_elastic/lambda_transport << 232 // correction in theta0 formula
251 const G4double rat = currentKinEnergy*invmev << 233 G4double w = G4Exp(lnZ/6.);
252 return lambda0*msc[idx]->factmin/ << 234 G4double facz = 0.990395+w*(-0.168386+w*0.093286) ;
253 (0.002 + rat*(msc[idx]->stepmina + msc[idx << 235 coeffth1 = facz*(1. - 8.7780e-2/Zeff);
>> 236 coeffth2 = facz*(4.0780e-2 + 1.7315e-4*Zeff);
>> 237
>> 238 // tail parameters
>> 239 G4double Z13 = w*w;
>> 240 coeffc1 = 2.3785 - Z13*(4.1981e-1 - Z13*6.3100e-2);
>> 241 coeffc2 = 4.7526e-1 + Z13*(1.7694 - Z13*3.3885e-1);
>> 242 coeffc3 = 2.3683e-1 - Z13*(1.8111 - Z13*3.2774e-1);
>> 243 coeffc4 = 1.7888e-2 + Z13*(1.9659e-2 - Z13*2.6664e-3);
>> 244
>> 245 Z2 = Zeff*Zeff;
>> 246 Z23 = Z13*Z13;
>> 247
>> 248 Zold = Zeff;
254 } 249 }
255 250
256 //....oooOO0OOooo........oooOO0OOooo........oo 251 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
257 252
258 inline G4double G4UrbanMscModel::ComputeTlimit << 253 inline
>> 254 G4double G4UrbanMscModel::SimpleScattering(G4double xmeanth, G4double x2meanth)
259 { 255 {
260 G4double x = (particle == positron) ? << 256 // 'large angle scattering'
261 0.7*msc[idx]->sqrtZ*stepmin : 0.87*msc[idx << 257 // 2 model functions with correct xmean and x2mean
262 if(currentKinEnergy < tlow) { x *= 0.5*(1.+c << 258 G4double a = (2.*xmeanth+9.*x2meanth-3.)/(2.*xmeanth-3.*x2meanth+1.);
263 return std::max(x, tlimitminfix); << 259 G4double prob = (a+2.)*xmeanth/a;
264 } <<
265 <<
266 //....oooOO0OOooo........oooOO0OOooo........oo <<
267 260
268 inline void G4UrbanMscModel::SetDisplacementAl << 261 // sampling
269 { << 262 G4double cth = 1.;
270 dispAlg96 = val; << 263 if(rndmEngineMod->flat() < prob) {
>> 264 cth = -1.+2.*G4Exp(G4Log(rndmEngineMod->flat())/(a+1.));
>> 265 } else {
>> 266 cth = -1.+2.*rndmEngineMod->flat();
>> 267 }
>> 268 return cth;
271 } 269 }
272 270
273 //....oooOO0OOooo........oooOO0OOooo........oo 271 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
274 272
275 inline void G4UrbanMscModel::SetPositronCorrec <<
276 { <<
277 fPosiCorrection = val; <<
278 } <<
279 <<
280 //....oooOO0OOooo........oooOO0OOooo........oo <<
281 273
282 #endif 274 #endif
283 275
284 276