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Geant4/processes/electromagnetic/standard/include/G4UniversalFluctuation.hh

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Differences between /processes/electromagnetic/standard/include/G4UniversalFluctuation.hh (Version 11.3.0) and /processes/electromagnetic/standard/include/G4UniversalFluctuation.hh (Version 5.0.p1)


  1 //                                                  1 
  2 // *******************************************    
  3 // * License and Disclaimer                       
  4 // *                                              
  5 // * The  Geant4 software  is  copyright of th    
  6 // * the Geant4 Collaboration.  It is provided    
  7 // * conditions of the Geant4 Software License    
  8 // * LICENSE and available at  http://cern.ch/    
  9 // * include a list of copyright holders.         
 10 // *                                              
 11 // * Neither the authors of this software syst    
 12 // * institutes,nor the agencies providing fin    
 13 // * work  make  any representation or  warran    
 14 // * regarding  this  software system or assum    
 15 // * use.  Please see the license in the file     
 16 // * for the full disclaimer and the limitatio    
 17 // *                                              
 18 // * This  code  implementation is the result     
 19 // * technical work of the GEANT4 collaboratio    
 20 // * By using,  copying,  modifying or  distri    
 21 // * any work based  on the software)  you  ag    
 22 // * use  in  resulting  scientific  publicati    
 23 // * acceptance of all terms of the Geant4 Sof    
 24 // *******************************************    
 25 //                                                
 26 // -------------------------------------------    
 27 //                                                
 28 // GEANT4 Class header file                       
 29 //                                                
 30 //                                                
 31 // File name:     G4UniversalFluctuation          
 32 //                                                
 33 // Author:        V.Ivanchenko make a class wi    
 34 //                                                
 35 // Creation date: 03.01.2002                      
 36 //                                                
 37 // Modifications:                                 
 38 //                                                
 39 //                                                
 40 // Class Description:                             
 41 //                                                
 42 // Implementation of energy loss fluctuations     
 43                                                   
 44 // -------------------------------------------    
 45 //                                                
 46                                                   
 47 #ifndef G4UniversalFluctuation_h                  
 48 #define G4UniversalFluctuation_h 1                
 49                                                   
 50 #include "G4VEmFluctuationModel.hh"               
 51 #include "G4ParticleDefinition.hh"                
 52 #include "G4Poisson.hh"                           
 53 #include <CLHEP/Random/RandomEngine.h>            
 54                                                   
 55 class G4UniversalFluctuation : public G4VEmFlu    
 56 {                                                 
 57                                                   
 58 public:                                           
 59                                                   
 60   explicit G4UniversalFluctuation(const G4Stri    
 61                                                   
 62   ~G4UniversalFluctuation() override;             
 63                                                   
 64   G4double SampleFluctuations(const G4Material    
 65             const G4DynamicParticle*,             
 66                               const G4double,     
 67             const G4double, const G4double) ov    
 68                                                   
 69   G4double Dispersion(const G4Material*,          
 70           const G4DynamicParticle*,               
 71                       const G4double, const G4    
 72                       const G4double) override    
 73                                                   
 74   // Initialisation for a new particle type       
 75   void InitialiseMe(const G4ParticleDefinition    
 76                                                   
 77   // Initialisation prestep                       
 78   void SetParticleAndCharge(const G4ParticleDe    
 79           G4double q2) override;                  
 80                                                   
 81   // hide assignment operator                     
 82   G4UniversalFluctuation & operator=              
 83   (const G4UniversalFluctuation &right) = dele    
 84   G4UniversalFluctuation(const G4UniversalFluc    
 85                                                   
 86 protected:                                        
 87                                                   
 88   virtual G4double SampleGlandz(CLHEP::HepRand    
 89                                 const G4Materi    
 90                                                   
 91   inline void AddExcitation(CLHEP::HepRandomEn    
 92                             const G4double ax,    
 93                             G4double& eav,        
 94                             G4double& eloss, G    
 95                                                   
 96   inline void SampleGauss(CLHEP::HepRandomEngi    
 97                           const G4double eav,     
 98                           G4double& eloss);       
 99                                                   
100   // particle properties                          
101   G4double particleMass = 0.0;                    
102   G4double m_Inv_particleMass = DBL_MAX;          
103   G4double m_massrate = DBL_MAX;                  
104   G4double chargeSquare = 1.0;                    
105                                                   
106   // material properties                          
107   G4double ipotFluct = 0.0;                       
108   G4double ipotLogFluct = 0.0;                    
109   G4double e0 = 0.0;                              
110                                                   
111   // model parameters                             
112   G4double minNumberInteractionsBohr = 10.0;      
113   G4double minLoss;                               
114   G4double nmaxCont = 8.0;                        
115   G4double rate = 0.56;                           
116   G4double fw = 4.0;                              
117   G4double a0 = 42.0;                             
118   G4double w2 = 0.0;                              
119   G4double meanLoss = 0.0;                        
120                                                   
121   const G4ParticleDefinition* particle = nullp    
122   G4double* rndmarray = nullptr;                  
123   G4int sizearray = 30;                           
124 };                                                
125                                                   
126 //....oooOO0OOooo........oooOO0OOooo........oo    
127                                                   
128 inline void                                       
129 G4UniversalFluctuation::AddExcitation(CLHEP::H    
130                                       const G4    
131                                       G4double    
132                                       G4double    
133 {                                                 
134   if(ax > nmaxCont) {                             
135     eav  += ax*ex;                                
136     esig2 += ax*ex*ex;                            
137   } else {                                        
138     const G4int p = (G4int)G4Poisson(ax);         
139     if(p > 0) { eloss += ((p + 1) - 2.*rndm->f    
140   }                                               
141 }                                                 
142                                                   
143 //....oooOO0OOooo........oooOO0OOooo........oo    
144                                                   
145 inline void                                       
146 G4UniversalFluctuation::SampleGauss(CLHEP::Hep    
147                                     const G4do    
148                                     G4double&     
149 {                                                 
150   G4double x = eav;                               
151   const G4double sig = std::sqrt(esig2);          
152   if(eav < 0.25*sig) {                            
153     x += (2.*rndm->flat() - 1.)*eav;              
154   } else {                                        
155     do {                                          
156       x = G4RandGauss::shoot(rndm, eav, sig);     
157     } while (x < 0.0 || x > 2*eav);               
158     // Loop checking, 23-Feb-2016, Vladimir Iv    
159   }                                               
160   eloss += x;                                     
161 }                                                 
162                                                   
163 //....oooOO0OOooo........oooOO0OOooo........oo    
164                                                   
165 #endif                                            
166                                                   
167