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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 #ifndef G4ElectronIonPair_h 27 #define G4ElectronIonPair_h 1 28 29 // ------------------------------------------- 30 // 31 // GEANT4 Class header file 32 // 33 // 34 // File name: G4ElectronIonPair 35 // 36 // Author: Vladimir Ivanchenko 37 // 38 // Creation date: 08.07.2008 39 // 40 // Modifications: 41 // 42 // 43 // Class Description: 44 // Compution on number of electon-ion or ele 45 // at the step of a particle and sampling io 46 // in space 47 // 48 // Based on ICRU Report 31, 1979 49 // "Average Energy Required to Produce an Ion 50 // 51 // 06.04.2010 V. Grichine, substitute Gauss by 52 // distribution at fix 53 // 54 // ------------------------------------------- 55 56 //....oooOO0OOooo........oooOO0OOooo........oo 57 //....oooOO0OOooo........oooOO0OOooo........oo 58 59 #include "globals.hh" 60 #include "G4Step.hh" 61 #include "G4ParticleDefinition.hh" 62 #include "G4ThreeVector.hh" 63 #include "G4VProcess.hh" 64 #include "Randomize.hh" 65 #include <vector> 66 67 //....oooOO0OOooo........oooOO0OOooo........oo 68 69 class G4Material; 70 71 class G4ElectronIonPair 72 { 73 public: 74 75 explicit G4ElectronIonPair(G4int verb); 76 77 virtual ~G4ElectronIonPair(); 78 79 // compute mean number of ionisation points 80 G4double MeanNumberOfIonsAlongStep(const G4P 81 const G4Material*, 82 G4double edepTotal, 83 G4double edepNIEL = 0.0); 84 85 inline G4double MeanNumberOfIonsAlongStep(co 86 87 inline G4int SampleNumberOfIonsAlongStep(con 88 89 // returns pointer to the new vector of posi 90 // ionisation points in the World coordinate 91 std::vector<G4ThreeVector>* SampleIonsAlongS 92 93 // compute number of holes in the atom after 94 G4int ResidualeChargePostStep(const G4Partic 95 const G4TrackVector* secondary = nullp 96 G4int processSubType = -1) const; 97 98 inline G4int ResidualeChargePostStep(const G 99 100 // find mean energies per ionisation 101 G4double FindG4MeanEnergyPerIonPair(const G4 102 103 // dump mean energies per ionisation used in 104 void DumpMeanEnergyPerIonPair() const; 105 106 // dump G4 list 107 void DumpG4MeanEnergyPerIonPair() const; 108 109 inline void SetVerbose(G4int); 110 111 // hide assignment operator 112 G4ElectronIonPair & operator=(const G4Electr 113 G4ElectronIonPair(const G4ElectronIonPair&) 114 115 private: 116 117 void Initialise(); 118 119 G4double FindMeanEnergyPerIonPair(const G4Ma 120 121 // cache 122 const G4Material* curMaterial; 123 G4double curMeanEnergy; 124 125 G4double invFanoFactor; 126 127 G4int verbose; 128 G4int nMaterials; 129 130 // list of G4 NIST materials with mean energ 131 std::vector<G4double> g4MatData; 132 std::vector<G4String> g4MatNames; 133 }; 134 135 inline G4double 136 G4ElectronIonPair::MeanNumberOfIonsAlongStep(c 137 { 138 return MeanNumberOfIonsAlongStep(step->GetTr 139 step->GetPreStepPoint()->GetMateria 140 step->GetTotalEnergyDeposit(), 141 step->GetNonIonizingEnergyDeposit() 142 } 143 144 inline G4int 145 G4ElectronIonPair::SampleNumberOfIonsAlongStep 146 { 147 // use gamma distribution with mean value n= 148 // dispersion D=meanion/invFanoFactor 149 G4double meanion = MeanNumberOfIonsAlongStep 150 return G4lrint(G4RandGamma::shoot(meanion*in 151 } 152 153 inline G4int 154 G4ElectronIonPair::ResidualeChargePostStep(con 155 { 156 G4int subtype = -1; 157 const G4VProcess* proc = step->GetPostStepPo 158 if(proc) { subtype = proc->GetProcessSubType 159 return ResidualeChargePostStep(step->GetTrac 160 step->GetSecondary(), 161 subtype); 162 } 163 164 inline void G4ElectronIonPair::SetVerbose(G4in 165 { 166 verbose = val; 167 } 168 169 #endif 170 171