source: trunk/source/processes/electromagnetic/standard/include/G4UrbanMscModel2.hh@ 1036

Last change on this file since 1036 was 1007, checked in by garnier, 17 years ago

update to geant4.9.2
File size: 6.6 KB
Line 
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 *
8// * LICENSE and available at http://cern.ch/geant4/license . These *
9// * include a list of copyright holders. *
10// * *
11// * Neither the authors of this software system, nor their employing *
12// * institutes,nor the agencies providing financial support for this *
13// * work make any representation or warranty, express or implied, *
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 *
22// * use in resulting scientific publications, and indicate your *
23// * acceptance of all terms of the Geant4 Software license. *
24// ********************************************************************
25//
26// $Id: G4UrbanMscModel2.hh,v 1.11 2008/12/18 13:01:34 gunter Exp $
27// GEANT4 tag $Name: geant4-09-02 $
28//
29// -------------------------------------------------------------------
30//
31//
32// GEANT4 Class header file
33//
34//
35// File name: G4UrbanMscModel2
36//
37// Author: Laszlo Urban
38//
39// Creation date: 06.03.2008
40//
41// Modifications:
42//
43//
44//
45// Class Description:
46//
47// Implementation of the model of multiple scattering based on
48// H.W.Lewis Phys Rev 78 (1950) 526 and L.Urban model
49
50// -------------------------------------------------------------------
51//
52
53#ifndef G4UrbanMscModel2_h
54#define G4UrbanMscModel2_h 1
55
56//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57
58#include "G4VMscModel.hh"
59#include "G4PhysicsTable.hh"
60#include "G4MscStepLimitType.hh"
61
62class G4ParticleChangeForMSC;
63class G4SafetyHelper;
64class G4LossTableManager;
65
66//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
67
68class G4UrbanMscModel2 : public G4VMscModel
69{
70
71public:
72
73 G4UrbanMscModel2(const G4String& nam = "UrbanMscUni2");
74
75 virtual ~G4UrbanMscModel2();
76
77 void Initialise(const G4ParticleDefinition*, const G4DataVector&);
78
79 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
80 G4double KineticEnergy,
81 G4double AtomicNumber,
82 G4double AtomicWeight=0.,
83 G4double cut =0.,
84 G4double emax=DBL_MAX);
85
86 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
87 const G4MaterialCutsCouple*,
88 const G4DynamicParticle*,
89 G4double,
90 G4double);
91
92 void SampleScattering(const G4DynamicParticle*,
93 G4double safety);
94
95 G4double ComputeTruePathLengthLimit(const G4Track& track,
96 G4PhysicsTable* theLambdaTable,
97 G4double currentMinimalStep);
98
99 G4double ComputeGeomPathLength(G4double truePathLength);
100
101 G4double ComputeTrueStepLength(G4double geomStepLength);
102
103 G4double ComputeTheta0(G4double truePathLength,
104 G4double KineticEnergy);
105
106private:
107
108 G4double SimpleScattering(G4double xmeanth, G4double x2meanth);
109
110 G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
111
112 G4double SampleDisplacement();
113
114 G4double LatCorrelation();
115
116 void GeomLimit(const G4Track& track);
117
118 inline G4double GetLambda(G4double kinEnergy);
119
120 inline void SetParticle(const G4ParticleDefinition*);
121
122 inline void UpdateCache();
123
124 // hide assignment operator
125 G4UrbanMscModel2 & operator=(const G4UrbanMscModel2 &right);
126 G4UrbanMscModel2(const G4UrbanMscModel2&);
127
128 const G4ParticleDefinition* particle;
129 G4ParticleChangeForMSC* fParticleChange;
130
131 G4SafetyHelper* safetyHelper;
132 G4PhysicsTable* theLambdaTable;
133 const G4MaterialCutsCouple* couple;
134 G4LossTableManager* theManager;
135
136
137 G4double mass;
138 G4double charge,ChargeSquare;
139 G4double masslimite,lambdalimit,fr;
140
141 G4double taubig;
142 G4double tausmall;
143 G4double taulim;
144 G4double currentTau;
145 G4double tlimit;
146 G4double tlimitmin;
147 G4double tlimitminfix;
148 G4double tgeom;
149
150 G4double geombig;
151 G4double geommin;
152 G4double geomlimit;
153 G4double skindepth;
154 G4double smallstep;
155
156 G4double presafety;
157
158 G4double lambda0;
159 G4double lambdaeff;
160 G4double tPathLength;
161 G4double zPathLength;
162 G4double par1,par2,par3;
163
164 G4double stepmin;
165
166 G4double currentKinEnergy;
167 G4double currentRange;
168 G4double rangeinit;
169 G4double currentRadLength;
170
171 G4double theta0max,rellossmax;
172 G4double third;
173
174 G4int currentMaterialIndex;
175
176 G4double y;
177 G4double Zold;
178 G4double Zeff,Z2,Z23,lnZ;
179 G4double coeffth1,coeffth2;
180 G4double coeffc1,coeffc2;
181 G4double scr1ini,scr2ini,scr1,scr2;
182
183 G4bool isInitialized;
184 G4bool inside;
185 G4bool insideskin;
186};
187
188//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
189//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
190
191inline
192G4double G4UrbanMscModel2::GetLambda(G4double e)
193{
194 G4double x;
195 if(theLambdaTable) {
196 G4bool b;
197 x = ((*theLambdaTable)[currentMaterialIndex])->GetValue(e, b);
198 } else {
199 x = CrossSection(couple,particle,e);
200 }
201 if(x > DBL_MIN) x = 1./x;
202 else x = DBL_MAX;
203 return x;
204}
205
206//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
207
208inline
209void G4UrbanMscModel2::SetParticle(const G4ParticleDefinition* p)
210{
211 if (p != particle) {
212 particle = p;
213 mass = p->GetPDGMass();
214 charge = p->GetPDGCharge()/eplus;
215 ChargeSquare = charge*charge;
216 }
217}
218
219//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
220
221inline
222void G4UrbanMscModel2::UpdateCache()
223{
224 lnZ = std::log(Zeff);
225 coeffth1 = 0.885+lnZ*(0.104-0.0170*lnZ);
226 coeffth2 = 0.028+lnZ*(0.012-0.00125*lnZ);
227 coeffc1 = 2.134-lnZ*(0.1045-0.00602*lnZ);
228 coeffc2 = 0.001126-lnZ*(0.0001089+0.0000247*lnZ);
229 Z2 = Zeff*Zeff;
230 Z23 = std::exp(2.*lnZ/3.);
231 scr1 = scr1ini*Z23;
232 scr2 = scr2ini*Z2*ChargeSquare;
233 // lastMaterial = couple->GetMaterial();
234 Zold = Zeff;
235}
236
237#endif
238
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