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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 // 27 // ------------------------------------------- 28 // 29 // GEANT4 Class file 30 // 31 // 32 // File name: G4UrbanFluctuation 33 // 34 // Author: V. Ivanchenko for Laszlo Urb 35 // 36 // Creation date: 14.02.2022 37 // 38 // Modifications: 39 // 40 // 41 42 //....oooOO0OOooo........oooOO0OOooo........oo 43 //....oooOO0OOooo........oooOO0OOooo........oo 44 45 #include "G4UrbanFluctuation.hh" 46 #include "G4PhysicalConstants.hh" 47 #include "G4SystemOfUnits.hh" 48 #include "Randomize.hh" 49 #include "G4Poisson.hh" 50 #include "G4Material.hh" 51 #include "G4Log.hh" 52 53 //....oooOO0OOooo........oooOO0OOooo........oo 54 55 G4UrbanFluctuation::G4UrbanFluctuation(const G 56 : G4UniversalFluctuation(nam) 57 {} 58 59 //....oooOO0OOooo........oooOO0OOooo........oo 60 61 G4UrbanFluctuation::~G4UrbanFluctuation() = de 62 63 //....oooOO0OOooo........oooOO0OOooo........oo 64 65 G4double G4UrbanFluctuation::SampleGlandz(CLHE 66 cons 67 const G4double tcut) 68 { 69 if (material != lastMaterial) { 70 auto ioni = material->GetIonisation(); 71 f1Fluct = ioni->GetF1fluct(); 72 f2Fluct = ioni->GetF2fluct(); 73 e1Fluct = ioni->GetEnergy1fluct(); 74 e2Fluct = ioni->GetEnergy2fluct(); 75 e1LogFluct = ioni->GetLogEnergy1fluct(); 76 e2LogFluct = ioni->GetLogEnergy2fluct(); 77 esmall = 0.5*std::sqrt(e0*ipotFluct); 78 lastMaterial = material; 79 } 80 81 G4double a1(0.0), a2(0.0), a3(0.0); 82 G4double loss = 0.0; 83 G4double e1 = e1Fluct; 84 G4double e2 = e2Fluct; 85 86 if(tcut > ipotFluct) { 87 if(w2 > ipotLogFluct) { 88 if(w2 > e2LogFluct) { 89 const G4double C = meanLoss*(1.-rate)/(w2-ip 90 a1 = C*f1Fluct*(w2-e1LogFluct)/e1Fluct; 91 a2 = C*f2Fluct*(w2-e2LogFluct)/e2Fluct; 92 } else { 93 a1 = meanLoss*(1.-rate)/e1; 94 } 95 if(a1 < a0) { 96 const G4double fwnow = 0.5+(fw-0.5)*st 97 a1 /= fwnow; 98 e1 *= fwnow; 99 } else { 100 a1 /= fw; 101 e1 *= fw; 102 } 103 } 104 } 105 106 const G4double w1 = tcut/e0; 107 a3 = rate*meanLoss*(tcut-e0)/(e0*tcut*G4Log( 108 if(a1+a2 <= 0.) { a3 /= rate; } 109 110 //'nearly' Gaussian fluctuation if a1>nmaxCo 111 G4double emean = 0.; 112 G4double sig2e = 0.; 113 114 // excitation of type 1 115 if(a1 > 0.0) { AddExcitation(rndmEngineF, a1 116 117 // excitation of type 2 118 if(a2 > 0.0) { AddExcitation(rndmEngineF, a2 119 120 if(sig2e > 0.0) { SampleGauss(rndmEngineF, e 121 122 // ionisation 123 if(a3 > 0.) { 124 emean = 0.; 125 sig2e = 0.; 126 G4double p3 = a3; 127 G4double alfa = 1.; 128 if(a3 > nmaxCont) { 129 alfa = w1*(nmaxCont+a3)/(w1*nmaxCont+a3) 130 const G4double alfa1 = alfa*G4Log(alfa) 131 const G4double namean = a3*w1*(alfa-1.)/ 132 emean += namean*e0*alfa1; 133 sig2e += e0*e0*namean*(alfa-alfa1*alfa1) 134 p3 -= namean; 135 } 136 137 const G4double w3 = alfa*e0; 138 if(tcut > w3) { 139 const G4double w = (tcut-w3)/tcut; 140 const G4int nnb = (G4int)G4Poisson(p3); 141 if(nnb > 0) { 142 if(nnb > sizearray) { 143 sizearray = nnb; 144 delete [] rndmarray; 145 rndmarray = new G4double[nnb]; 146 } 147 rndmEngineF->flatArray(nnb, rndmarray) 148 for (G4int k=0; k<nnb; ++k) { loss += 149 } 150 } 151 if(sig2e > 0.0) { SampleGauss(rndmEngineF, 152 } 153 //G4cout << "### loss=" << loss << G4endl; 154 return loss; 155 } 156 157 //....oooOO0OOooo........oooOO0OOooo........oo 158