source: trunk/source/processes/electromagnetic/standard/include/G4UrbanMscModel93.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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10// * *
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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 *
21// * any work based on the software) you agree to acknowledge its *
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24// ********************************************************************
25//
26// $Id: G4UrbanMscModel93.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: G4UrbanMscModel93
36//
37// Author: Laszlo Urban
38//
39// Creation date: 06.03.2008
40//
41// Modifications:
42// 23-04-2009 L.Urban updated parameterization in UpdateCache method
43// 28-10-2009 V.Ivanchenko moved G4UrbanMscModel2 to G4UrbanMscModel93,
44// now it is a frozen version of the Urban model corresponding
45// to g4 9.3
46//
47//
48// Class Description:
49//
50// Implementation of the model of multiple scattering based on
51// H.W.Lewis Phys Rev 78 (1950) 526 and L.Urban model
52
53// -------------------------------------------------------------------
54//
55
56#ifndef G4UrbanMscModel93_h
57#define G4UrbanMscModel93_h 1
58
59//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60
61#include "G4VMscModel.hh"
62#include "G4PhysicsTable.hh"
63#include "G4MscStepLimitType.hh"
64
65class G4ParticleChangeForMSC;
66class G4SafetyHelper;
67class G4LossTableManager;
68
69//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
70
71class G4UrbanMscModel93 : public G4VMscModel
72{
73
74public:
75
76 G4UrbanMscModel93(const G4String& nam = "UrbanMsc93");
77
78 virtual ~G4UrbanMscModel93();
79
80 void Initialise(const G4ParticleDefinition*, const G4DataVector&);
81
82 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
83 G4double KineticEnergy,
84 G4double AtomicNumber,
85 G4double AtomicWeight=0.,
86 G4double cut =0.,
87 G4double emax=DBL_MAX);
88
89 void SampleScattering(const G4DynamicParticle*,
90 G4double safety);
91
92 G4double ComputeTruePathLengthLimit(const G4Track& track,
93 G4PhysicsTable* theLambdaTable,
94 G4double currentMinimalStep);
95
96 G4double ComputeGeomPathLength(G4double truePathLength);
97
98 G4double ComputeTrueStepLength(G4double geomStepLength);
99
100 G4double ComputeTheta0(G4double truePathLength,
101 G4double KineticEnergy);
102
103private:
104
105 G4double SimpleScattering(G4double xmeanth, G4double x2meanth);
106
107 G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
108
109 G4double SampleDisplacement();
110
111 G4double LatCorrelation();
112
113 inline G4double GetLambda(G4double kinEnergy);
114
115 inline void SetParticle(const G4ParticleDefinition*);
116
117 inline void UpdateCache();
118
119 // hide assignment operator
120 G4UrbanMscModel93 & operator=(const G4UrbanMscModel93 &right);
121 G4UrbanMscModel93(const G4UrbanMscModel93&);
122
123 const G4ParticleDefinition* particle;
124 G4ParticleChangeForMSC* fParticleChange;
125
126 G4PhysicsTable* theLambdaTable;
127 const G4MaterialCutsCouple* couple;
128 G4LossTableManager* theManager;
129
130 G4double mass;
131 G4double charge,ChargeSquare;
132 G4double masslimite,lambdalimit,fr;
133
134 G4double taubig;
135 G4double tausmall;
136 G4double taulim;
137 G4double currentTau;
138 G4double tlimit;
139 G4double tlimitmin;
140 G4double tlimitminfix;
141 G4double tgeom;
142
143 G4double geombig;
144 G4double geommin;
145 G4double geomlimit;
146 G4double skindepth;
147 G4double smallstep;
148
149 G4double presafety;
150
151 G4double lambda0;
152 G4double lambdaeff;
153 G4double tPathLength;
154 G4double zPathLength;
155 G4double par1,par2,par3;
156
157 G4double stepmin;
158
159 G4double currentKinEnergy;
160 G4double currentRange;
161 G4double rangeinit;
162 G4double currentRadLength;
163
164 G4double theta0max,rellossmax;
165 G4double third;
166
167 G4int currentMaterialIndex;
168
169 G4double y;
170 G4double Zold;
171 G4double Zeff,Z2,Z23,lnZ;
172 G4double coeffth1,coeffth2;
173 G4double coeffc1,coeffc2;
174 G4double scr1ini,scr2ini,scr1,scr2;
175
176 G4bool isInitialized;
177 G4bool inside;
178 G4bool insideskin;
179};
180
181//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
182//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
183
184inline
185G4double G4UrbanMscModel93::GetLambda(G4double e)
186{
187 G4double x;
188 if(theLambdaTable) {
189 G4bool b;
190 x = ((*theLambdaTable)[currentMaterialIndex])->GetValue(e, b);
191 } else {
192 x = CrossSection(couple,particle,e);
193 }
194 if(x > DBL_MIN) x = 1./x;
195 else x = DBL_MAX;
196 return x;
197}
198
199//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
200
201inline
202void G4UrbanMscModel93::SetParticle(const G4ParticleDefinition* p)
203{
204 if (p != particle) {
205 particle = p;
206 mass = p->GetPDGMass();
207 charge = p->GetPDGCharge()/eplus;
208 ChargeSquare = charge*charge;
209 }
210}
211
212//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
213
214inline
215void G4UrbanMscModel93::UpdateCache()
216{
217 lnZ = std::log(Zeff);
218 //new correction in theta0 formula
219 coeffth1 = (1.-8.7780e-2/Zeff)*(0.87+0.03*lnZ);
220 coeffth2 = (4.0780e-2+1.7315e-4*Zeff)*(0.87+0.03*lnZ);
221 // tail parameters
222 G4double lnZ1 = std::log(Zeff+1.);
223 coeffc1 = 2.943-0.197*lnZ1;
224 coeffc2 = 0.0987-0.0143*lnZ1;
225 // for single scattering
226 Z2 = Zeff*Zeff;
227 Z23 = std::exp(2.*lnZ/3.);
228 scr1 = scr1ini*Z23;
229 scr2 = scr2ini*Z2*ChargeSquare;
230
231 Zold = Zeff;
232}
233
234#endif
235
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