Par02Smearer Class Reference

#include <Par02Smearer.hh>

Public Member Functions
G4ThreeVector	SmearMomentum (const G4Track *aTrack, G4double aResolution=-1)
G4double	SmearEnergy (const G4Track *aTrack, G4double aResolution=-1)
G4ThreeVector	SmearGaussian (const G4Track *aTrackOriginal, G4double aResolution)
G4double	Gauss (G4double aMean, G4double aStandardDeviation)

Static Public Member Functions
static Par02Smearer *	Instance ()

Protected Member Functions
	Par02Smearer ()
	A default constructor. More...
	~Par02Smearer ()

Detailed Description

Smearing of the particle momentum or energy.

A singleton class used to smear (alter) the particle momentum (for tracking detectors) and energy (for calorimeters). In case the resolution is given, the momentum (energy) is smeared with Gaussian distribution.

Author

Anna Zaborowska

Definition at line 47 of file Par02Smearer.hh.

Constructor & Destructor Documentation

Par02Smearer::Par02Smearer ( )

protected

A default constructor.

Definition at line 47 of file Par02Smearer.cc.

                           {
  time_t seed = time( NULL );
  fRandomEngine = new CLHEP::HepJamesRandom( static_cast< long >( seed ) );
  fRandomGauss = new CLHEP::RandGauss( fRandomEngine );
}

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Par02Smearer::~Par02Smearer ( )

protected

Definition at line 55 of file Par02Smearer.cc.

{}

Member Function Documentation

G4double Par02Smearer::Gauss	(	G4double	aMean,
		G4double	aStandardDeviation
	)

Returns a random number from a Gaussian distribution.

Parameters

aMean	The mean of the Gaussian distribution.
aStandardDeviation	The standard deviation of a Gaussian distribution.

Definition at line 103 of file Par02Smearer.cc.

                                                                          {
  return fRandomGauss->fire( aMean, aStandardDeviation );
}

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Par02Smearer * Par02Smearer::Instance ( void  )

static

Allows the access to the unique Par02Smearer class object.

Returns

A pointer to the Par02Smearer class.

Definition at line 59 of file Par02Smearer.cc.

                                     {
  if ( ! fPar02Smearer ) {
    fPar02Smearer = new Par02Smearer();
  }
  return fPar02Smearer;
}

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G4double Par02Smearer::SmearEnergy	(	const G4Track *	aTrack,
		G4double	aResolution = -1
	)

Smears the energy deposit with a given resolution.

Parameters

aTrack	A track to smear.
aResolution	A resolution. Gaussian smearing is done with a given resolution as a standard deviation.

Definition at line 75 of file Par02Smearer.cc.

                                                           {
  G4double newE = -1.0;
  while ( newE < 0.0 ) {  // To ensure that the resulting value is not negative
                          // (vital for energy smearing, does not change direction
                          // for momentum smearing)
    if ( aResolution != -1.0 ) {
      newE = aTrackOriginal->GetKineticEnergy() * Gauss( 1.0, aResolution );
    } else {
      newE = aTrackOriginal->GetKineticEnergy();
    }
  }
  return newE;
}

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G4ThreeVector Par02Smearer::SmearGaussian	(	const G4Track *	aTrackOriginal,
		G4double	aResolution
	)

First possible type of smearing. Smears the momentum with a given resolution.

Parameters

aTrackOriginal	A track to smear.
aResolution	A resolution taken as a standard deviation of a Gaussian distribution.

Definition at line 92 of file Par02Smearer.cc.

                                                                  {
  G4ThreeVector originP = aTrackOriginal->GetMomentum();
  G4ThreeVector originPos = aTrackOriginal->GetPosition();
  G4double rdm = Gauss( 1.0, aResolution );
  G4ThreeVector smearedMom( originP.x()*rdm, originP.y()*rdm, originP.z()*rdm );
  return smearedMom;
}

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G4ThreeVector Par02Smearer::SmearMomentum	(	const G4Track *	aTrack,
		G4double	aResolution = -1
	)

Smears the momentum with a given resolution.

Parameters

aTrack	A track to smear.
aResolution	A resolution. Gaussian smearing is done with a given resolution as a standard deviation.

Definition at line 68 of file Par02Smearer.cc.

                                                                  {
  return SmearGaussian( aTrackOriginal, aResolution );
}

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---

The documentation for this class was generated from the following files:

• source/geant4.10.03.p02/examples/extended/parameterisations/Par02/include/Par02Smearer.hh
• source/geant4.10.03.p02/examples/extended/parameterisations/Par02/src/Par02Smearer.cc