source: trunk/source/processes/electromagnetic/standard/include/G4UrbanMscModel92.hh@ 1199

Last change on this file since 1199 was 1197, checked in by garnier, 16 years ago

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1//
2// ********************************************************************
3// * License and Disclaimer *
4// * *
5// * The Geant4 software is copyright of the Copyright Holders of *
6// * the Geant4 Collaboration. It is provided under the terms and *
7// * conditions of the Geant4 Software License, included in the file *
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14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
16// * for the full disclaimer and the limitation of liability. *
17// * *
18// * This code implementation is the result of the scientific and *
19// * technical work of the GEANT4 collaboration. *
20// * By using, copying, modifying or distributing the software (or *
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24// ********************************************************************
25//
26// $Id: G4UrbanMscModel92.hh,v 1.1 2009/11/01 13:04:12 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-03-cand-01 $
28//
29// -------------------------------------------------------------------
30//
31//
32// GEANT4 Class header file
33//
34//
35// File name: G4UrbanMscModel92
36//
37// Author: Laszlo Urban
38//
39// Creation date: 06.03.2008
40//
41// Modifications:
42//
43// 28-10-2009 V.Ivanchenko moved G4UrbanMscModel to G4UrbanMscModel92,
44// now it is a frozen version of the Urban model corresponding
45// to g4 9.2
46//
47// Class Description:
48//
49// Implementation of the model of multiple scattering based on
50// H.W.Lewis Phys Rev 78 (1950) 526 and L.Urban model
51
52// -------------------------------------------------------------------
53//
54
55#ifndef G4UrbanMscModel92_h
56#define G4UrbanMscModel92_h 1
57
58//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59
60#include "G4VMscModel.hh"
61#include "G4PhysicsTable.hh"
62#include "G4MscStepLimitType.hh"
63
64class G4ParticleChangeForMSC;
65class G4SafetyHelper;
66class G4LossTableManager;
67
68//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70class G4UrbanMscModel92 : public G4VMscModel
71{
72
73public:
74
75 G4UrbanMscModel92(const G4String& nam = "UrbanMsc92");
76
77 virtual ~G4UrbanMscModel92();
78
79 void Initialise(const G4ParticleDefinition*, const G4DataVector&);
80
81 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
82 G4double KineticEnergy,
83 G4double AtomicNumber,
84 G4double AtomicWeight=0.,
85 G4double cut =0.,
86 G4double emax=DBL_MAX);
87
88 void SampleScattering(const G4DynamicParticle*,
89 G4double safety);
90
91 G4double ComputeTruePathLengthLimit(const G4Track& track,
92 G4PhysicsTable* theLambdaTable,
93 G4double currentMinimalStep);
94
95 G4double ComputeGeomPathLength(G4double truePathLength);
96
97 G4double ComputeTrueStepLength(G4double geomStepLength);
98
99 G4double ComputeTheta0(G4double truePathLength,
100 G4double KineticEnergy);
101
102private:
103
104 G4double SimpleScattering(G4double xmeanth, G4double x2meanth);
105
106 G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
107
108 G4double SampleDisplacement();
109
110 G4double LatCorrelation();
111
112 inline G4double GetLambda(G4double kinEnergy);
113
114 inline void SetParticle(const G4ParticleDefinition*);
115
116 inline void UpdateCache();
117
118 // hide assignment operator
119 G4UrbanMscModel92 & operator=(const G4UrbanMscModel92 &right);
120 G4UrbanMscModel92(const G4UrbanMscModel92&);
121
122 const G4ParticleDefinition* particle;
123 G4ParticleChangeForMSC* fParticleChange;
124
125 G4PhysicsTable* theLambdaTable;
126 const G4MaterialCutsCouple* couple;
127 G4LossTableManager* theManager;
128
129 G4double mass;
130 G4double charge,ChargeSquare;
131 G4double masslimite,lambdalimit,fr;
132
133 G4double taubig;
134 G4double tausmall;
135 G4double taulim;
136 G4double currentTau;
137 G4double tlimit;
138 G4double tlimitmin;
139 G4double tlimitminfix;
140 G4double tgeom;
141
142 G4double geombig;
143 G4double geommin;
144 G4double geomlimit;
145 G4double skindepth;
146 G4double smallstep;
147
148 G4double presafety;
149
150 G4double lambda0;
151 G4double lambdaeff;
152 G4double tPathLength;
153 G4double zPathLength;
154 G4double par1,par2,par3;
155
156 G4double stepmin;
157
158 G4double currentKinEnergy;
159 G4double currentRange;
160 G4double rangeinit;
161 G4double currentRadLength;
162
163 G4double theta0max,rellossmax;
164 G4double third;
165
166 G4int currentMaterialIndex;
167
168 G4double y;
169 G4double Zold;
170 G4double Zeff,Z2,Z23,lnZ;
171 G4double coeffth1,coeffth2;
172 G4double coeffc1,coeffc2;
173 G4double scr1ini,scr2ini,scr1,scr2;
174
175 G4bool isInitialized;
176 G4bool inside;
177 G4bool insideskin;
178};
179
180//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
181//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
182
183inline
184G4double G4UrbanMscModel92::GetLambda(G4double e)
185{
186 G4double x;
187 if(theLambdaTable) {
188 G4bool b;
189 x = ((*theLambdaTable)[currentMaterialIndex])->GetValue(e, b);
190 } else {
191 x = CrossSection(couple,particle,e);
192 }
193 if(x > DBL_MIN) x = 1./x;
194 else x = DBL_MAX;
195 return x;
196}
197
198//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
199
200inline
201void G4UrbanMscModel92::SetParticle(const G4ParticleDefinition* p)
202{
203 if (p != particle) {
204 particle = p;
205 mass = p->GetPDGMass();
206 charge = p->GetPDGCharge()/eplus;
207 ChargeSquare = charge*charge;
208 }
209}
210
211//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
212
213inline
214void G4UrbanMscModel92::UpdateCache()
215{
216 lnZ = std::log(Zeff);
217 coeffth1 = 0.885+lnZ*(0.104-0.0170*lnZ);
218 coeffth2 = 0.028+lnZ*(0.012-0.00125*lnZ);
219 coeffc1 = 2.134-lnZ*(0.1045-0.00602*lnZ);
220 coeffc2 = 0.001126-lnZ*(0.0001089+0.0000247*lnZ);
221 Z2 = Zeff*Zeff;
222 Z23 = std::exp(2.*lnZ/3.);
223 scr1 = scr1ini*Z23;
224 scr2 = scr2ini*Z2*ChargeSquare;
225 // lastMaterial = couple->GetMaterial();
226 Zold = Zeff;
227}
228
229#endif
230
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