Par02/src/Par02Smearer.cc

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0025 //
0026 //
0027 /// \file Par02Smearer.cc
0028 /// \brief Implementation of the Par02Smearer class
0029
0030 #include "Par02Smearer.hh"
0031
0032 #include "Par02PrimaryParticleInformation.hh"
0033
0034 #include "G4FieldManager.hh"
0035 #include "G4PrimaryParticle.hh"
0036 #include "G4SystemOfUnits.hh"
0037 #include "G4TransportationManager.hh"
0038 #include "G4UniformMagField.hh"
0039 #include "G4UnitsTable.hh"
0040
0041 #include <ctime>
0042
0043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0044
0045 Par02Smearer* Par02Smearer::fPar02Smearer = nullptr;
0046
0047 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0048
0049 Par02Smearer::Par02Smearer()
0050 {
0051   time_t seed = time(NULL);
0052   fRandomEngine = new CLHEP::HepJamesRandom(static_cast<long>(seed));
0053   fRandomGauss = new CLHEP::RandGauss(fRandomEngine);
0054 }
0055
0056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0057
0058 Par02Smearer::~Par02Smearer() = default;
0059
0060 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0061
0062 Par02Smearer* Par02Smearer::Instance()
0063 {
0064   if (!fPar02Smearer) {
0065     fPar02Smearer = new Par02Smearer();
0066   }
0067   return fPar02Smearer;
0068 }
0069
0070 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0071
0072 G4ThreeVector Par02Smearer::SmearMomentum(const G4Track* aTrackOriginal, G4double aResolution)
0073 {
0074   return SmearGaussian(aTrackOriginal, aResolution);
0075 }
0076
0077 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0078
0079 G4double Par02Smearer::SmearEnergy(const G4Track* aTrackOriginal, G4double aResolution)
0080 {
0081   G4double newE = -1.0;
0082   while (newE < 0.0) {  // To ensure that the resulting value is not negative
0083                         // (vital for energy smearing, does not change direction
0084                         // for momentum smearing)
0085     if (aResolution != -1.0) {
0086       newE = aTrackOriginal->GetKineticEnergy() * Gauss(1.0, aResolution);
0087     }
0088     else {
0089       newE = aTrackOriginal->GetKineticEnergy();
0090     }
0091   }
0092   return newE;
0093 }
0094
0095 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0096
0097 G4ThreeVector Par02Smearer::SmearGaussian(const G4Track* aTrackOriginal, G4double aResolution)
0098 {
0099   G4ThreeVector originP = aTrackOriginal->GetMomentum();
0100   G4ThreeVector originPos = aTrackOriginal->GetPosition();
0101   G4double rdm = Gauss(1.0, aResolution);
0102   G4ThreeVector smearedMom(originP.x() * rdm, originP.y() * rdm, originP.z() * rdm);
0103   return smearedMom;
0104 }
0105
0106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0107
0108 G4double Par02Smearer::Gauss(G4double aMean, G4double aStandardDeviation)
0109 {
0110   return fRandomGauss->fire(aMean, aStandardDeviation);
0111 }
0112
0113 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......