Geant4 Cross Reference |
1 // 2 // ******************************************************************** 3 // * License and Disclaimer * 4 // * * 5 // * The Geant4 software is copyright of the Copyright Holders of * 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 * 12 // * institutes,nor the agencies providing financial support for this * 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 // 27 /// \file Par02Smearer.cc 28 /// \brief Implementation of the Par02Smearer class 29 30 #include "Par02Smearer.hh" 31 32 #include "Par02PrimaryParticleInformation.hh" 33 34 #include "G4FieldManager.hh" 35 #include "G4PrimaryParticle.hh" 36 #include "G4SystemOfUnits.hh" 37 #include "G4TransportationManager.hh" 38 #include "G4UniformMagField.hh" 39 #include "G4UnitsTable.hh" 40 41 #include <ctime> 42 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 44 45 Par02Smearer* Par02Smearer::fPar02Smearer = nullptr; 46 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 48 49 Par02Smearer::Par02Smearer() 50 { 51 time_t seed = time(NULL); 52 fRandomEngine = new CLHEP::HepJamesRandom(static_cast<long>(seed)); 53 fRandomGauss = new CLHEP::RandGauss(fRandomEngine); 54 } 55 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 57 58 Par02Smearer::~Par02Smearer() = default; 59 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 61 62 Par02Smearer* Par02Smearer::Instance() 63 { 64 if (!fPar02Smearer) { 65 fPar02Smearer = new Par02Smearer(); 66 } 67 return fPar02Smearer; 68 } 69 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 71 72 G4ThreeVector Par02Smearer::SmearMomentum(const G4Track* aTrackOriginal, G4double aResolution) 73 { 74 return SmearGaussian(aTrackOriginal, aResolution); 75 } 76 77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 78 79 G4double Par02Smearer::SmearEnergy(const G4Track* aTrackOriginal, G4double aResolution) 80 { 81 G4double newE = -1.0; 82 while (newE < 0.0) { // To ensure that the resulting value is not negative 83 // (vital for energy smearing, does not change direction 84 // for momentum smearing) 85 if (aResolution != -1.0) { 86 newE = aTrackOriginal->GetKineticEnergy() * Gauss(1.0, aResolution); 87 } 88 else { 89 newE = aTrackOriginal->GetKineticEnergy(); 90 } 91 } 92 return newE; 93 } 94 95 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 96 97 G4ThreeVector Par02Smearer::SmearGaussian(const G4Track* aTrackOriginal, G4double aResolution) 98 { 99 G4ThreeVector originP = aTrackOriginal->GetMomentum(); 100 G4ThreeVector originPos = aTrackOriginal->GetPosition(); 101 G4double rdm = Gauss(1.0, aResolution); 102 G4ThreeVector smearedMom(originP.x() * rdm, originP.y() * rdm, originP.z() * rdm); 103 return smearedMom; 104 } 105 106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 107 108 G4double Par02Smearer::Gauss(G4double aMean, G4double aStandardDeviation) 109 { 110 return fRandomGauss->fire(aMean, aStandardDeviation); 111 } 112 113 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 114