Gabriele Cosmo
113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file Par02Smearer.cc
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/// \brief Implementation of the Par02Smearer class
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#include "Par02Smearer.hh"
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#include "Par02PrimaryParticleInformation.hh"
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#include "G4FieldManager.hh"
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#include "G4PrimaryParticle.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4TransportationManager.hh"
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#include "G4UniformMagField.hh"
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#include "G4UnitsTable.hh"
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#include <ctime>
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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Par02Smearer* Par02Smearer::fPar02Smearer = nullptr;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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Par02Smearer::Par02Smearer()
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{
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time_t seed = time(NULL);
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fRandomEngine = new CLHEP::HepJamesRandom(static_cast<long>(seed));
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fRandomGauss = new CLHEP::RandGauss(fRandomEngine);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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Par02Smearer::~Par02Smearer() = default;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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Par02Smearer* Par02Smearer::Instance()
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{
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if (!fPar02Smearer) {
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fPar02Smearer = new Par02Smearer();
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}
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return fPar02Smearer;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4ThreeVector Par02Smearer::SmearMomentum(const G4Track* aTrackOriginal, G4double aResolution)
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{
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return SmearGaussian(aTrackOriginal, aResolution);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double Par02Smearer::SmearEnergy(const G4Track* aTrackOriginal, G4double aResolution)
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{
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G4double newE = -1.0;
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while (newE < 0.0) { // To ensure that the resulting value is not negative
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// (vital for energy smearing, does not change direction
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// for momentum smearing)
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if (aResolution != -1.0) {
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newE = aTrackOriginal->GetKineticEnergy() * Gauss(1.0, aResolution);
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}
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else {
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newE = aTrackOriginal->GetKineticEnergy();
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}
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}
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return newE;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4ThreeVector Par02Smearer::SmearGaussian(const G4Track* aTrackOriginal, G4double aResolution)
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{
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G4ThreeVector originP = aTrackOriginal->GetMomentum();
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G4ThreeVector originPos = aTrackOriginal->GetPosition();
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G4double rdm = Gauss(1.0, aResolution);
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G4ThreeVector smearedMom(originP.x() * rdm, originP.y() * rdm, originP.z() * rdm);
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return smearedMom;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double Par02Smearer::Gauss(G4double aMean, G4double aStandardDeviation)
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{
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return fRandomGauss->fire(aMean, aStandardDeviation);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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