Geant4  10.02.p01
Par02Smearer.cc
Go to the documentation of this file.
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 // $Id: $
27 //
30 
31 #include "Par02Smearer.hh"
33 #include "G4PrimaryParticle.hh"
34 #include "G4UnitsTable.hh"
35 #include "G4SystemOfUnits.hh"
37 #include "G4FieldManager.hh"
38 #include "G4UniformMagField.hh"
39 #include <ctime>
40 
41 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
42 
44 
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
46 
48  time_t seed = time( NULL );
49  fRandomEngine = new CLHEP::HepJamesRandom( static_cast< long >( seed ) );
50  fRandomGauss = new CLHEP::RandGauss( fRandomEngine );
51 }
52 
53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
54 
56 
57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58 
60  if ( ! fPar02Smearer ) {
62  }
63  return fPar02Smearer;
64 }
65 
66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
67 
69  G4double aResolution ) {
70  return SmearGaussian( aTrackOriginal, aResolution );
71 }
72 
73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
74 
75 G4double Par02Smearer::SmearEnergy( const G4Track* aTrackOriginal,
76  G4double aResolution ) {
77  G4double newE = -1.0;
78  while ( newE < 0.0 ) { // To ensure that the resulting value is not negative
79  // (vital for energy smearing, does not change direction
80  // for momentum smearing)
81  if ( aResolution != -1.0 ) {
82  newE = aTrackOriginal->GetKineticEnergy() * Gauss( 1.0, aResolution );
83  } else {
84  newE = aTrackOriginal->GetKineticEnergy();
85  }
86  }
87  return newE;
88 }
89 
90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
91 
93  G4double aResolution ) {
94  G4ThreeVector originP = aTrackOriginal->GetMomentum();
95  G4ThreeVector originPos = aTrackOriginal->GetPosition();
96  G4double rdm = Gauss( 1.0, aResolution );
97  G4ThreeVector smearedMom( originP.x()*rdm, originP.y()*rdm, originP.z()*rdm );
98  return smearedMom;
99 }
100 
101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
102 
103 G4double Par02Smearer::Gauss( G4double aMean, G4double aStandardDeviation ) {
104  return fRandomGauss->fire( aMean, aStandardDeviation );
105 }
106 
107 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
108 
static Par02Smearer * Instance()
Allows the access to the unique Par02Smearer class object.
Definition: Par02Smearer.cc:59
CLHEP::Hep3Vector G4ThreeVector
CLHEP::RandGauss * fRandomGauss
CLHEP random engine used in gaussian smearing.
Definition: Par02Smearer.hh:93
const G4ThreeVector & GetPosition() const
static Par02Smearer * fPar02Smearer
A pointer to Par02Smearer object.
Definition: Par02Smearer.hh:87
Definition of the Par02PrimaryParticleInformation class.
G4ThreeVector SmearMomentum(const G4Track *aTrack, G4double aResolution=-1)
Smears the momentum with a given resolution.
Definition: Par02Smearer.cc:68
G4double SmearEnergy(const G4Track *aTrack, G4double aResolution=-1)
Smears the energy deposit with a given resolution.
Definition: Par02Smearer.cc:75
Definition of the Par02Smearer class.
G4double GetKineticEnergy() const
Par02Smearer()
A default constructor.
Definition: Par02Smearer.cc:47
Smearing of the particle momentum or energy.
Definition: Par02Smearer.hh:47
G4ThreeVector GetMomentum() const
G4ThreeVector SmearGaussian(const G4Track *aTrackOriginal, G4double aResolution)
First possible type of smearing. Smears the momentum with a given resolution.
Definition: Par02Smearer.cc:92
CLHEP::HepRandomEngine * fRandomEngine
CLHEP random engine.
Definition: Par02Smearer.hh:90
double G4double
Definition: G4Types.hh:76
G4double Gauss(G4double aMean, G4double aStandardDeviation)
Returns a random number from a Gaussian distribution.