source: trunk/source/processes/electromagnetic/standard/include/G4UrbanMscModel.hh@ 899

Last change on this file since 899 was 819, checked in by garnier, 17 years ago

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1//
2// ********************************************************************
3// * License and Disclaimer *
4// * *
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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 *
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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: G4UrbanMscModel.hh,v 1.31 2007/10/29 08:42:43 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-01-patch-02 $
28//
29// -------------------------------------------------------------------
30//
31//
32// GEANT4 Class header file
33//
34//
35// File name: G4UrbanMscModel
36//
37// Author: Laszlo Urban
38//
39// Creation date: 01.03.2001
40//
41// Modifications:
42//
43// 27-03-03 Move model part from G4MultipleScattering (V.Ivanchenko)
44// 27-03-03 Rename (V.Ivanchenko)
45//
46// 05-08-03 angle distribution has been modified (L.Urban)
47// 26-11-03 new data member currentRange (L.Urban)
48// 01-03-04 changes in data members + signature changed in SampleCosineTheta
49// 11-03-04 changes in data members (L.Urban)
50// 23-04-04 changes in data members and in signature of SampleCosineTheta
51// (L.Urban)
52// 17-08-04 name of data member facxsi changed to factail (L.Urban)
53// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
54// 15-04-05 optimize internal interface - add SampleSecondaries method (V.Ivanchenko)
55// 11-08-05 computation of lateral correlation added (L.Urban)
56// 02-10-05 nuclear size correction computation removed, the correction
57// included in the (theoretical) tabulated values (L.Urban)
58// 16-02-06 data members b and xsi have been removed (L.Urban)
59// 17-02-06 Save table of transport cross sections not mfp (V.Ivanchenko)
60// 07-03-06 Create G4UrbanMscModel and move there step limit calculation (V.Ivanchenko)
61// 10-05-06 SetMscStepLimitation at initialisation (V.Ivantchenko)
62// 11-05-06 name of data member safety changed to presafety, some new data
63// members added (frscaling1,frscaling2,tlimitminfix,nstepmax)
64// (L.Urban)
65// 13-10-06 data member factail removed, data member tkinlimit changed
66// to lambdalimit,
67// new data members tgeom,tnow,skin,skindepth,Zeff,geomlimit
68// G4double GeomLimit(const G4Track& track) changed to
69// void GeomLimit(const G4Track& track) (L.Urban)
70// 20-10-06 parameter theta0 now computed in the (public)
71// function ComputeTheta0,
72// single scattering modified allowing not small
73// angles as well (L.Urban)
74// 31-01-07 code cleaning (L.Urban)
75// 06-02-07 Move SetMscStepLimitation method into the source (VI)
76// 15-02-07 new data member : smallstep (L.Urban)
77// 10-04-07 remove navigator, smallstep, tnow (V.Ivanchenko)
78//
79//
80// Class Description:
81//
82// Implementation of the model of multiple scattering based on
83// H.W.Lewis Phys Rev 78 (1950) 526 and L.Urban model
84
85// -------------------------------------------------------------------
86//
87
88#ifndef G4UrbanMscModel_h
89#define G4UrbanMscModel_h 1
90
91//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
92
93#include "G4VEmModel.hh"
94#include "G4PhysicsTable.hh"
95#include "G4MscStepLimitType.hh"
96
97class G4ParticleChangeForMSC;
98class G4SafetyHelper;
99class G4LossTableManager;
100
101//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
102
103class G4UrbanMscModel : public G4VEmModel
104{
105
106public:
107
108 G4UrbanMscModel(G4double facrange, G4double dtrl, G4double lambdalimit,
109 G4double facgeom,G4double skin,
110 G4bool samplez, G4MscStepLimitType stepAlg,
111 const G4String& nam = "UrbanMscUni");
112
113 virtual ~G4UrbanMscModel();
114
115 virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
116
117 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
118 G4double KineticEnergy,
119 G4double AtomicNumber,
120 G4double AtomicWeight=0.,
121 G4double cut =0.,
122 G4double emax=DBL_MAX);
123
124 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
125 const G4MaterialCutsCouple*,
126 const G4DynamicParticle*,
127 G4double,
128 G4double);
129
130 void SampleScattering(const G4DynamicParticle*,
131 G4double safety);
132
133 G4double ComputeTruePathLengthLimit(const G4Track& track,
134 G4PhysicsTable* theLambdaTable,
135 G4double currentMinimalStep);
136
137 G4double ComputeGeomPathLength(G4double truePathLength);
138
139 G4double ComputeTrueStepLength(G4double geomStepLength);
140
141 G4double ComputeTheta0(G4double truePathLength,
142 G4double KineticEnergy);
143
144 void SetStepLimitType(G4MscStepLimitType);
145
146 void SetLateralDisplasmentFlag(G4bool val);
147
148 void SetRangeFactor(G4double);
149
150 void SetGeomFactor(G4double);
151
152 void SetSkin(G4double);
153
154private:
155
156 G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
157
158 G4double SampleDisplacement();
159
160 G4double LatCorrelation();
161
162 G4double GetLambda(G4double kinEnergy);
163
164 void GeomLimit(const G4Track& track);
165
166 void SetParticle(const G4ParticleDefinition* p);
167
168 // hide assignment operator
169 G4UrbanMscModel & operator=(const G4UrbanMscModel &right);
170 G4UrbanMscModel(const G4UrbanMscModel&);
171
172 const G4ParticleDefinition* particle;
173 G4ParticleChangeForMSC* fParticleChange;
174
175 G4SafetyHelper* safetyHelper;
176 G4PhysicsTable* theLambdaTable;
177 const G4MaterialCutsCouple* couple;
178 G4LossTableManager* theManager;
179
180
181 G4double mass;
182 G4double charge;
183
184 G4double masslimite,masslimitmu;
185
186 G4double taubig;
187 G4double tausmall;
188 G4double taulim;
189 G4double currentTau;
190 G4double dtrl;
191
192 G4double lambdalimit;
193 G4double facrange;
194 G4double frscaling1,frscaling2;
195 G4double tlimit;
196 G4double tlimitmin;
197 G4double tlimitminfix;
198
199 G4double nstepmax;
200 G4double geombig;
201 G4double geommin;
202 G4double geomlimit;
203 G4double facgeom;
204 G4double skin;
205 G4double skindepth;
206 G4double smallstep;
207
208 G4double presafety;
209 G4double facsafety;
210
211 G4double lambda0;
212 G4double lambdaeff;
213 G4double tPathLength;
214 G4double zPathLength;
215 G4double par1,par2,par3 ;
216
217 G4double stepmin ;
218
219 G4double currentKinEnergy;
220 G4double currentRange;
221 G4double currentRadLength;
222
223 G4double Zeff;
224
225 G4int currentMaterialIndex;
226
227 G4MscStepLimitType steppingAlgorithm;
228
229 G4bool samplez;
230 G4bool latDisplasment;
231 G4bool isInitialized;
232
233 G4bool inside;
234 G4bool insideskin;
235
236};
237
238//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
239//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
240
241inline
242void G4UrbanMscModel::SetLateralDisplasmentFlag(G4bool val)
243{
244 latDisplasment = val;
245}
246
247//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
248
249inline
250void G4UrbanMscModel::SetSkin(G4double val)
251{
252 skin = val;
253 stepmin = tlimitminfix;
254 skindepth = skin*stepmin;
255}
256
257//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
258
259inline
260void G4UrbanMscModel::SetRangeFactor(G4double val)
261{
262 facrange = val;
263}
264
265//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
266
267inline
268void G4UrbanMscModel::SetGeomFactor(G4double val)
269{
270 facgeom = val;
271}
272
273//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
274
275inline
276void G4UrbanMscModel::SetStepLimitType(G4MscStepLimitType val)
277{
278 steppingAlgorithm = val;
279}
280
281//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
282
283inline
284G4double G4UrbanMscModel::GetLambda(G4double e)
285{
286 G4double x;
287 if(theLambdaTable) {
288 G4bool b;
289 x = ((*theLambdaTable)[currentMaterialIndex])->GetValue(e, b);
290 } else {
291 x = CrossSection(couple,particle,e);
292 }
293 if(x > DBL_MIN) x = 1./x;
294 else x = DBL_MAX;
295 return x;
296}
297
298//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
299
300inline
301void G4UrbanMscModel::SetParticle(const G4ParticleDefinition* p)
302{
303 if (p != particle) {
304 particle = p;
305 mass = p->GetPDGMass();
306 charge = p->GetPDGCharge()/eplus;
307 }
308}
309
310//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
311
312#endif
313
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