G4EnergyLossForExtrapolator Class Reference

#include <G4EnergyLossForExtrapolator.hh>

Public Member Functions
	G4EnergyLossForExtrapolator (G4int verb=1)
	~G4EnergyLossForExtrapolator ()
G4double	ComputeDEDX (G4double kinEnergy, const G4ParticleDefinition *)
G4double	ComputeRange (G4double kinEnergy, const G4ParticleDefinition *)
G4double	ComputeEnergy (G4double range, const G4ParticleDefinition *)
G4double	EnergyAfterStep (G4double kinEnergy, G4double step, const G4Material *, const G4ParticleDefinition *)
G4double	EnergyBeforeStep (G4double kinEnergy, G4double step, const G4Material *, const G4ParticleDefinition *)
G4double	TrueStepLength (G4double kinEnergy, G4double step, const G4Material *, const G4ParticleDefinition *part)
G4double	EnergyAfterStep (G4double kinEnergy, G4double step, const G4Material *, const G4String &particleName)
G4double	EnergyBeforeStep (G4double kinEnergy, G4double step, const G4Material *, const G4String &particleName)
G4double	AverageScatteringAngle (G4double kinEnergy, G4double step, const G4Material *, const G4ParticleDefinition *part)
G4double	AverageScatteringAngle (G4double kinEnergy, G4double step, const G4Material *, const G4String &particleName)
G4double	ComputeTrueStep (const G4Material *, const G4ParticleDefinition *part, G4double kinEnergy, G4double stepLength)
G4double	EnergyDispersion (G4double kinEnergy, G4double step, const G4Material *, const G4ParticleDefinition *)
G4double	EnergyDispersion (G4double kinEnergy, G4double step, const G4Material *, const G4String &particleName)
void	SetVerbose (G4int val)
void	SetMinKinEnergy (G4double)
void	SetMaxKinEnergy (G4double)
void	SetMaxEnergyTransfer (G4double)

Detailed Description

Definition at line 67 of file G4EnergyLossForExtrapolator.hh.

Constructor & Destructor Documentation

G4EnergyLossForExtrapolator::G4EnergyLossForExtrapolator ( G4int  verb = 1 )

explicit

Definition at line 67 of file G4EnergyLossForExtrapolator.cc.

  : maxEnergyTransfer(DBL_MAX), verbose(verb)
{
  currentParticle = nullptr;
  currentMaterial = nullptr;

  linLossLimit = 0.01;
  emin         = 1.*MeV;
  emax         = 10.*TeV;
  nbins        = 70;

  nmat = index = 0;

  mass = charge2 = electronDensity = radLength = bg2 = beta2 
    = kineticEnergy = tmax = 0.0;
  gam = 1.0;

  idxDedxElectron = idxDedxPositron = idxDedxMuon = idxDedxProton 
    = idxRangeElectron = idxRangePositron = idxRangeMuon = idxRangeProton
    = idxInvRangeElectron = idxInvRangePositron = idxInvRangeMuon
    = idxInvRangeProton = idxMscElectron = 0;
 
  electron = positron = proton = muonPlus = muonMinus = nullptr;
}

G4EnergyLossForExtrapolator::~G4EnergyLossForExtrapolator

(

)

Definition at line 346 of file G4EnergyLossForExtrapolator.cc.

{
  G4AutoLock l(&G4EnergyLossForExtrapolatorMutex);
  delete tables;
  tables = nullptr;
}

Member Function Documentation

G4double G4EnergyLossForExtrapolator::AverageScatteringAngle ( G4double  kinEnergy, G4double  step, const G4Material *  mat, const G4ParticleDefinition *  part  )

inline

Definition at line 248 of file G4EnergyLossForExtrapolator.hh.

{
  G4double theta = 0.0;
  if(SetupKinematics(part, mat, kinEnergy)) {
    G4double t = stepLength/radLength;
    G4double y = std::max(0.001, t); 
    theta = 19.23*CLHEP::MeV*std::sqrt(charge2*t)*(1.0 + 0.038*G4Log(y))
      /(beta2*gam*mass);
  }
  return theta;
}

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G4double G4EnergyLossForExtrapolator::AverageScatteringAngle ( G4double  kinEnergy, G4double  step, const G4Material *  mat, const G4String &  particleName  )

inline

Definition at line 227 of file G4EnergyLossForExtrapolator.hh.

{
  return AverageScatteringAngle(kinEnergy,step,mat,FindParticle(name));
}

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G4double G4EnergyLossForExtrapolator::ComputeDEDX	(	G4double	kinEnergy,
		const G4ParticleDefinition *	part
	)

Definition at line 240 of file G4EnergyLossForExtrapolator.cc.

{
  G4double x = 0.0;
  if(part == electron)  { 
    x = ComputeValue(ekin, GetPhysicsTable(fDedxElectron), idxDedxElectron);
  } else if(part == positron) {
    x = ComputeValue(ekin, GetPhysicsTable(fDedxPositron), idxDedxPositron);
  } else if(part == muonPlus || part == muonMinus) {
    x = ComputeValue(ekin, GetPhysicsTable(fDedxMuon), idxDedxMuon);
  } else {
    G4double e = ekin*proton_mass_c2/mass;
    x = ComputeValue(e, GetPhysicsTable(fDedxProton), idxDedxProton)*charge2;
  }
  return x;
}

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G4double G4EnergyLossForExtrapolator::ComputeEnergy	(	G4double	range,
		const G4ParticleDefinition *	part
	)

Definition at line 282 of file G4EnergyLossForExtrapolator.cc.

{
  G4double x = 0.0;
  if(part == electron) {
    x = ComputeValue(range, GetPhysicsTable(fInvRangeElectron), 
             idxInvRangeElectron);
  } else if(part == positron) {
    x = ComputeValue(range, GetPhysicsTable(fInvRangePositron), 
             idxInvRangePositron);
  } else if(part == muonPlus || part == muonMinus) {
    x = ComputeValue(range, GetPhysicsTable(fInvRangeMuon), idxInvRangeMuon);
  } else {
    G4double massratio = proton_mass_c2/mass;
    G4double r = range*massratio*charge2;
    x = ComputeValue(r, GetPhysicsTable(fInvRangeProton), 
             idxInvRangeProton)/massratio;
  }
  return x;
}

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G4double G4EnergyLossForExtrapolator::ComputeRange	(	G4double	kinEnergy,
		const G4ParticleDefinition *	part
	)

Definition at line 260 of file G4EnergyLossForExtrapolator.cc.

{
  G4double x = 0.0;
  if(part == electron) { 
    x = ComputeValue(ekin, GetPhysicsTable(fRangeElectron), idxRangeElectron);
  } else if(part == positron) {
    x = ComputeValue(ekin, GetPhysicsTable(fRangePositron), idxRangePositron);
  } else if(part == muonPlus || part == muonMinus) { 
    x = ComputeValue(ekin, GetPhysicsTable(fRangeMuon), idxRangeMuon);
  } else {
    G4double massratio = proton_mass_c2/mass;
    G4double e = ekin*massratio;
    x = ComputeValue(e, GetPhysicsTable(fRangeProton), idxRangeProton)
      /(charge2*massratio);
  }
  return x;
}

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G4double G4EnergyLossForExtrapolator::ComputeTrueStep ( const G4Material *  mat, const G4ParticleDefinition *  part, G4double  kinEnergy, G4double  stepLength  )

inline

Definition at line 267 of file G4EnergyLossForExtrapolator.hh.

{
  G4double theta = AverageScatteringAngle(kinEnergy,stepLength,mat,part);
  return stepLength*std::sqrt(1.0 + 0.625*theta*theta);
} 

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G4double G4EnergyLossForExtrapolator::EnergyAfterStep	(	G4double	kinEnergy,
		G4double	step,
		const G4Material *	mat,
		const G4ParticleDefinition *	part
	)

Definition at line 95 of file G4EnergyLossForExtrapolator.cc.

{
  if(0 == nmat) { Initialisation(); }
  G4double kinEnergyFinal = kinEnergy;
  if(SetupKinematics(part, mat, kinEnergy)) {
    G4double step = TrueStepLength(kinEnergy,stepLength,mat,part);
    G4double r  = ComputeRange(kinEnergy,part);
    if(r <= step) {
      kinEnergyFinal = 0.0;
    } else if(step < linLossLimit*r) {
      kinEnergyFinal -= step*ComputeDEDX(kinEnergy,part);
    } else {  
      G4double r1 = r - step;
      kinEnergyFinal = ComputeEnergy(r1,part);
    }
  }
  return kinEnergyFinal;
}

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G4double G4EnergyLossForExtrapolator::EnergyAfterStep ( G4double  kinEnergy, G4double  step, const G4Material *  mat, const G4String &  particleName  )

inline

Definition at line 205 of file G4EnergyLossForExtrapolator.hh.

{
  return EnergyAfterStep(kinEnergy,step,mat,FindParticle(name));
}

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G4double G4EnergyLossForExtrapolator::EnergyBeforeStep	(	G4double	kinEnergy,
		G4double	step,
		const G4Material *	mat,
		const G4ParticleDefinition *	part
	)

Definition at line 120 of file G4EnergyLossForExtrapolator.cc.

{
  //G4cout << "G4EnergyLossForExtrapolator::EnergyBeforeStep" << G4endl;
  if(0 == nmat) { Initialisation(); }
  G4double kinEnergyFinal = kinEnergy;

  if(SetupKinematics(part, mat, kinEnergy)) {
    G4double step = TrueStepLength(kinEnergy,stepLength,mat,part);
    G4double r  = ComputeRange(kinEnergy,part);

    if(step < linLossLimit*r) {
      kinEnergyFinal += step*ComputeDEDX(kinEnergy,part);
    } else {  
      G4double r1 = r + step;
      kinEnergyFinal = ComputeEnergy(r1,part);
    }
  }
  return kinEnergyFinal;
}

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G4double G4EnergyLossForExtrapolator::EnergyBeforeStep ( G4double  kinEnergy, G4double  step, const G4Material *  mat, const G4String &  particleName  )

inline

Definition at line 216 of file G4EnergyLossForExtrapolator.hh.

{
  return EnergyBeforeStep(kinEnergy,step,mat,FindParticle(name));
}

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G4double G4EnergyLossForExtrapolator::EnergyDispersion ( G4double  kinEnergy, G4double  step, const G4Material *  mat, const G4ParticleDefinition *  part  )

inline

Definition at line 279 of file G4EnergyLossForExtrapolator.hh.

{
  G4double sig2 = 0.0;
  if(SetupKinematics(part, mat, kinEnergy)) {
    G4double step = ComputeTrueStep(mat,part,kinEnergy,stepLength);
    sig2 = (1.0/beta2 - 0.5)
      *CLHEP::twopi_mc2_rcl2*tmax*step*electronDensity*charge2;
  }
  return sig2;
}

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G4double G4EnergyLossForExtrapolator::EnergyDispersion ( G4double  kinEnergy, G4double  step, const G4Material *  mat, const G4String &  particleName  )

inline

Definition at line 238 of file G4EnergyLossForExtrapolator.hh.

{
  return EnergyDispersion(kinEnergy,step,mat,FindParticle(name));
}

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void G4EnergyLossForExtrapolator::SetMaxEnergyTransfer ( G4double  val )

inline

Definition at line 328 of file G4EnergyLossForExtrapolator.hh.

{
  maxEnergyTransfer = val;
}

void G4EnergyLossForExtrapolator::SetMaxKinEnergy ( G4double  val )

inline

Definition at line 321 of file G4EnergyLossForExtrapolator.hh.

{
  emax = val;
}

void G4EnergyLossForExtrapolator::SetMinKinEnergy ( G4double  val )

inline

Definition at line 314 of file G4EnergyLossForExtrapolator.hh.

{
  emin = val;
}

void G4EnergyLossForExtrapolator::SetVerbose ( G4int  val )

inline

Definition at line 307 of file G4EnergyLossForExtrapolator.hh.

{
  verbose = val;
}

G4double G4EnergyLossForExtrapolator::TrueStepLength	(	G4double	kinEnergy,
		G4double	step,
		const G4Material *	mat,
		const G4ParticleDefinition *	part
	)

Definition at line 146 of file G4EnergyLossForExtrapolator.cc.

{
  G4double res = stepLength;
  if(0 == nmat) { Initialisation(); }
  //G4cout << "## G4EnergyLossForExtrapolator::TrueStepLength L= " << res 
  //     <<  "  " << part->GetParticleName() << G4endl;
  if(SetupKinematics(part, mat, kinEnergy)) {
    if(part == electron || part == positron) {
      G4double x = stepLength*
    ComputeValue(kinEnergy, GetPhysicsTable(fMscElectron), idxMscElectron);
      //G4cout << " x= " << x << G4endl;
      if(x < 0.2)         { res *= (1.0 + 0.5*x + x*x/3.0); }
      else if(x < 0.9999) { res = -G4Log(1.0 - x)*stepLength/x; }
      else                { res = ComputeRange(kinEnergy,part); }
    } else {
      res = ComputeTrueStep(mat,part,kinEnergy,stepLength);
    }
  }
  return res;
}

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---

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

• source/geant4.10.03.p02/source/processes/electromagnetic/muons/include/G4EnergyLossForExtrapolator.hh
• source/geant4.10.03.p02/source/processes/electromagnetic/muons/src/G4EnergyLossForExtrapolator.cc