source: trunk/source/processes/electromagnetic/muons/include/G4MuPairProductionModel.hh @ 924

Last change on this file since 924 was 819, checked in by garnier, 16 years ago

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26// $Id: G4MuPairProductionModel.hh,v 1.24 2007/10/11 13:52:03 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-01-patch-02 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class header file
32//
33//
34// File name:     G4MuPairProductionModel
35//
36// Author:        Vladimir Ivanchenko on base of Laszlo Urban code
37//
38// Creation date: 18.05.2002
39//
40// Modifications:
41//
42// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
43// 27-01-03 Make models region aware (V.Ivanchenko)
44// 13-02-03 Add name (V.Ivanchenko)
45// 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
46// 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
47// 13-02-06 Add ComputeCrossSectionPerAtom (mma)
48// 12-05-06 Add parameter to SelectRandomAtom (A.Bogdanov)
49// 11-10-07 Add ignoreCut flag (V.Ivanchenko)
50
51//
52// Class Description:
53//
54// Implementation of e+e- pair production by muons
55//
56
57// -------------------------------------------------------------------
58//
59
60#ifndef G4MuPairProductionModel_h
61#define G4MuPairProductionModel_h 1
62
63#include "G4VEmModel.hh"
64#include <vector>
65
66class G4Element;
67class G4ParticleChangeForLoss;
68class G4ParticleChangeForGamma;
69
70class G4MuPairProductionModel : public G4VEmModel
71{
72
73public:
74
75  G4MuPairProductionModel(const G4ParticleDefinition* p = 0,
76                          const G4String& nam = "muPairProd");
77
78  virtual ~G4MuPairProductionModel();
79
80  void SetParticle(const G4ParticleDefinition*);
81
82  void Initialise(const G4ParticleDefinition*, const G4DataVector&);
83
84  void SetLowestKineticEnergy(G4double e) {lowestKinEnergy = e;};
85
86  G4double MinEnergyCut(const G4ParticleDefinition*,
87                        const G4MaterialCutsCouple*);
88                       
89  virtual G4double ComputeCrossSectionPerAtom(
90                                 const G4ParticleDefinition*,
91                                 G4double kineticEnergy,
92                                 G4double Z, G4double A,
93                                 G4double cutEnergy,
94                                 G4double maxEnergy);
95                                 
96  virtual G4double CrossSectionPerVolume(const G4Material*,
97                         const G4ParticleDefinition*,
98                               G4double kineticEnergy,
99                               G4double cutEnergy,
100                               G4double maxEnergy);
101                               
102  virtual G4double ComputeDEDXPerVolume(const G4Material*,
103                                const G4ParticleDefinition*,
104                                G4double kineticEnergy,
105                                G4double cutEnergy);
106
107  void SampleSecondaries(std::vector<G4DynamicParticle*>*, 
108                         const G4MaterialCutsCouple*,
109                         const G4DynamicParticle*,
110                         G4double tmin,
111                         G4double maxEnergy);
112
113protected:
114
115  inline G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
116                                     G4double kineticEnergy);
117
118
119public:
120
121  G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut,
122                            G4double tmax);
123
124  G4double ComputeMicroscopicCrossSection(G4double tkin,
125                                          G4double Z,
126                                          G4double cut);
127
128  G4double ComputeDMicroscopicCrossSection(G4double tkin,
129                                           G4double Z,
130                                           G4double pairEnergy);
131
132  inline void SetIgnoreCutFlag(G4bool);
133
134  inline G4bool IgnoreCutFlag() const;
135
136private:
137
138  const G4Element* SelectRandomAtom(G4double kinEnergy, 
139                                    G4double dt, 
140                                    G4int it,
141                                    const G4MaterialCutsCouple* couple, 
142                                    G4double tmin);
143
144  void MakeSamplingTables();
145
146  void SetCurrentElement(G4double Z);
147
148  inline G4double InterpolatedIntegralCrossSection(
149                     G4double dt, G4double dz, G4int iz,
150                     G4int it, G4int iy, G4double z);
151
152  // hide assignment operator
153  G4MuPairProductionModel & operator=(const  G4MuPairProductionModel &right);
154  G4MuPairProductionModel(const  G4MuPairProductionModel&);
155
156  G4ParticleDefinition*       theElectron;
157  G4ParticleDefinition*       thePositron;
158  G4ParticleChangeForLoss*    fParticleChange;
159  G4ParticleChangeForGamma*   gParticleChange;
160
161  G4double minPairEnergy;
162  G4double lowestKinEnergy;
163
164  G4double factorForCross;
165  G4double sqrte;
166  G4double particleMass;
167  G4double currentZ;
168  G4double z13;
169  G4double z23;
170  G4double lnZ;
171
172  const G4ParticleDefinition* particle;
173
174  // tables for sampling
175  G4int nzdat;
176  G4int ntdat;
177  G4int nbiny;
178  size_t nmaxElements;
179  static G4double zdat[5],adat[5],tdat[8],xgi[8],wgi[8];
180  G4double ya[1001],proba[5][8][1001];
181
182  G4double ymin;
183  G4double ymax;
184  G4double dy;
185
186  G4bool  ignoreCut;
187
188  G4bool  samplingTablesAreFilled;
189  std::vector<G4double>   partialSum;
190};
191
192//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
193
194inline G4double G4MuPairProductionModel::MaxSecondaryEnergy(
195                                 const G4ParticleDefinition*,
196                                       G4double kineticEnergy)
197{
198  G4double maxPairEnergy = kineticEnergy + particleMass*(1.0 - 0.75*sqrte*z13);
199  return maxPairEnergy;
200}
201
202//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
203
204inline void G4MuPairProductionModel::SetCurrentElement(G4double Z)
205{
206  if(Z != currentZ) {
207    currentZ = Z;
208    z13 = std::pow(Z,0.333333333);
209    z23 = z13*z13;
210    lnZ = std::log(Z);
211  }
212}
213
214//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
215
216inline G4double G4MuPairProductionModel::InterpolatedIntegralCrossSection(
217                G4double dt, G4double dz,
218                G4int iz, G4int it, G4int iy, G4double z)
219{
220  G4double fac =  1./(zdat[iz]  *(zdat[iz]  +1.));
221  G4double fac1 = 1./(zdat[iz-1]*(zdat[iz-1]+1.));
222  G4double f0 = fac1*proba[iz-1][it-1][iy] + 
223                (fac*proba[iz][it-1][iy]-fac1*proba[iz-1][it-1][iy])*dz;
224  G4double f1 = fac1*proba[iz-1][it  ][iy] + 
225                (fac*proba[iz][it  ][iy]-fac1*proba[iz-1][it  ][iy])*dz;
226  return (f0 + (f1-f0)*dt)*z*(z+1.);
227}
228
229//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
230
231inline void G4MuPairProductionModel::SetIgnoreCutFlag(G4bool val)
232{
233  ignoreCut = val;
234}
235
236//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
237
238inline G4bool G4MuPairProductionModel::IgnoreCutFlag() const
239{
240  return ignoreCut;
241}
242
243//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
244
245#endif
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