source: trunk/source/processes/electromagnetic/standard/include/G4UrbanMscModel.hh @ 924

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

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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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