GFlashSamplingShowerParameterisation Class Reference

#include <GFlashSamplingShowerParameterisation.hh>

Inheritance diagram for GFlashSamplingShowerParameterisation:

Collaboration diagram for GFlashSamplingShowerParameterisation:

Public Member Functions
	GFlashSamplingShowerParameterisation (G4Material *aMat1, G4Material *aMat2, G4double d1, G4double d2, GFlashSamplingShowerTuning *aPar=0)
	~GFlashSamplingShowerParameterisation ()
void	ComputeRadialParameters (G4double y, G4double Tau)
void	GenerateLongitudinalProfile (G4double Energy)
void	ComputeZAX0EFFetc ()
G4double	IntegrateEneLongitudinal (G4double LongitudinalStep)
G4double	IntegrateNspLongitudinal (G4double LongitudinalStep)
G4double	ComputeTau (G4double LongitudinalPosition)
void	SetMaterial (G4Material *mat1, G4Material *mat2)
G4double	GeneratePhi ()
G4double	GenerateRadius (G4int ispot, G4double Energy, G4double LongitudinalPosition)
G4double	GenerateExponential (G4double Energy)
G4double	GetAveR99 ()
G4double	GetAveR90 ()
G4double	GetAveTmx ()
G4double	GetAveT99 ()
G4double	GetAveT90 ()
G4double	GetNspot ()
G4double	GetX0 ()
G4double	GetEc ()
G4double	GetRm ()
G4double	ApplySampling (const G4double DEne, const G4double Energy)
Public Member Functions inherited from GVFlashShowerParameterisation
	GVFlashShowerParameterisation ()
virtual	~GVFlashShowerParameterisation ()
G4double	GeneratePhi ()
G4double	GetEffZ (const G4Material *material)
G4double	GetEffA (const G4Material *material)
G4double	gam (G4double x, G4double a) const
void	PrintMaterial (const G4Material *mat)

Additional Inherited Members
Protected Attributes inherited from GVFlashShowerParameterisation
GVFlashHomoShowerTuning *	thePar
G4double	density
G4double	A
G4double	Z
G4double	X0
G4double	Ec
G4double	Rm
G4double	NSpot

Detailed Description

Definition at line 50 of file GFlashSamplingShowerParameterisation.hh.

Constructor & Destructor Documentation

GFlashSamplingShowerParameterisation::GFlashSamplingShowerParameterisation	(	G4Material *	aMat1,
		G4Material *	aMat2,
		G4double	d1,
		G4double	d2,
		GFlashSamplingShowerTuning *	aPar = 0
	)

Definition at line 48 of file GFlashSamplingShowerParameterisation.cc.

  : GVFlashShowerParameterisation(),
    ParAveT2(0.), ParSigLogT1(0.), ParSigLogT2(0.),
    ParSigLogA1(0.), ParSigLogA2(0.), ParRho1(0.), ParRho2(0.), ParsAveA2(0.),
    AveLogAlphah(0.), AveLogTmaxh(0.), SigmaLogAlphah(0.), SigmaLogTmaxh(0.),
    Rhoh(0.), Alphah(0.), Tmaxh(0.), Betah(0.), AveLogAlpha(0.), AveLogTmax(0.),
    SigmaLogAlpha(0.), SigmaLogTmax(0.), Rho(0.), Alpha(0.), Tmax(0.), Beta(0.)
{  
  if(!aPar) { thePar = new GFlashSamplingShowerTuning; owning = true; }
  else      { thePar = aPar; owning = false; }

  SetMaterial(aMat1,aMat2 );
  d1=dd1;
  d2=dd2;

  // Longitudinal Coefficients for a homogenious calo

  // shower max
  ParAveT1    = thePar->ParAveT1();   // ln (ln y -0.812)  
  ParAveA1    = thePar->ParAveA1();   // ln a (0.81 + (0.458 + 2.26/Z)ln y)
  ParAveA2    = thePar->ParAveA2();
  ParAveA3    = thePar->ParAveA3();
  // Sampling
  ParsAveT1   = thePar->ParsAveT1();  // T_sam = log(exp( log T_hom) + t1*Fs-1 + t2*(1-ehat));
  ParsAveT2   = thePar->ParsAveT2();
  ParsAveA1   = thePar->ParsAveA1();  
  // Variance of shower max sampling 
  ParsSigLogT1 = thePar->ParSigLogT1();    // Sigma T1 (-2.5 + 1.25 ln y)**-1 
  ParsSigLogT2 = thePar->ParSigLogT2();
  // variance of 'alpha'
  ParsSigLogA1 = thePar->ParSigLogA1();    // Sigma a (-0.82 + 0.79 ln y)**-1 
  ParsSigLogA2 = thePar->ParSigLogA2();  
  // correlation alpha%T
  ParsRho1     = thePar->ParRho1();   // Rho = 0.784 -0.023 ln y 
  ParsRho2     = thePar->ParRho2();

  // Radial Coefficients
  // r_C (tau)= z_1 +z_2 tau
  // r_t (tau)= k1 (std::exp (k3(tau -k2 ))+std::exp (k_4 (tau- k_2))))
  ParRC1 =   thePar->ParRC1();  // z_1 = 0.0251 + 0.00319 ln E
  ParRC2 =   thePar->ParRC2();
  ParRC3 =   thePar->ParRC3();  // z_2 = 0.1162 + - 0.000381 Z
  ParRC4 =   thePar->ParRC4();

  ParWC1 = thePar->ParWC1();
  ParWC2 = thePar->ParWC2();
  ParWC3 = thePar->ParWC3();
  ParWC4 = thePar->ParWC4();
  ParWC5 = thePar->ParWC5(); 
  ParWC6 = thePar->ParWC6();
  ParRT1 = thePar->ParRT1();
  ParRT2 = thePar->ParRT2();
  ParRT3 = thePar->ParRT3();
  ParRT4 = thePar->ParRT4(); 
  ParRT5 = thePar->ParRT5();
  ParRT6 = thePar->ParRT6();

  //additional sampling parameter
  ParsRC1= thePar->ParsRC1();
  ParsRC2= thePar->ParsRC2();
  ParsWC1= thePar->ParsWC1();
  ParsWC2=  thePar->ParsWC2(); 
  ParsRT1= thePar->ParsRT1();
  ParsRT2= thePar->ParsRT2();

  // Coeff for fluctuedted radial  profiles for a sampling media
  ParsSpotT1   = thePar->ParSpotT1();     // T_spot = T_hom =(0.698 + 0.00212)
  ParsSpotT2   = thePar->ParSpotT2();
  ParsSpotA1   = thePar->ParSpotA1();     // a_spot= a_hom (0.639 + 0.00334)
  ParsSpotA2   = thePar->ParSpotA2();    
  ParsSpotN1   = thePar->ParSpotN1();     // N_Spot 93 * ln(Z) E ** 0.876   
  ParsSpotN2   = thePar->ParSpotN2(); 
  SamplingResolution  = thePar->SamplingResolution();
  ConstantResolution  = thePar->ConstantResolution(); 
  NoiseResolution     = thePar->NoiseResolution();

  // Inits
  NSpot         = 0.00;
  AlphaNSpot    = 0.00;
  TNSpot        = 0.00;
  BetaNSpot     = 0.00;
  RadiusCore    = 0.00;
  WeightCore    = 0.00;
  RadiusTail    = 0.00;   
  ComputeZAX0EFFetc();

  G4cout << "/********************************************/ " << G4endl;
  G4cout << "  - GFlashSamplingShowerParameterisation::Constructor -  " << G4endl;
  G4cout << "/********************************************/ " << G4endl;  
}

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GFlashSamplingShowerParameterisation::~GFlashSamplingShowerParameterisation

(

)

Definition at line 143 of file GFlashSamplingShowerParameterisation.cc.

{
  if(owning) { delete thePar; }
}

Member Function Documentation

G4double GFlashSamplingShowerParameterisation::ApplySampling	(	const G4double	DEne,
		const G4double	Energy
	)

Definition at line 294 of file GFlashSamplingShowerParameterisation.cc.

{
  G4double DEneFluctuated = DEne;
  G4double Resolution     = std::pow(SamplingResolution,2);

  //       +pow(NoiseResolution,2)/  //@@@@@@@@ FIXME 
  //                         Energy*(1.*MeV)+
  //                         pow(ConstantResolution,2)*
  //                          Energy/(1.*MeV);

  if(Resolution >0.0 && DEne > 0.00)
  {
    G4float x1=DEne/Resolution;
    G4float x2 = G4RandGamma::shoot(x1, 1.0)*Resolution;     
    DEneFluctuated=x2;
  }
  return DEneFluctuated;
}

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void GFlashSamplingShowerParameterisation::ComputeRadialParameters ( G4double  y, G4double  Tau  )

virtual

Implements GVFlashShowerParameterisation.

Definition at line 383 of file GFlashSamplingShowerParameterisation.cc.

{
  G4double z1 = ParRC1 + ParRC2* std::log(Energy/GeV);         //ok
  G4double z2 = ParRC3+ParRC4*Zeff;                            //ok
  RadiusCore  =  z1 + z2 * Tau;                                //ok 
  G4double p1 = ParWC1+ParWC2*Zeff;                            //ok
  G4double p2 = ParWC3+ParWC4*Zeff;                            //ok
  G4double p3 = ParWC5+ParWC6*std::log(Energy/GeV);            //ok
  WeightCore   =  p1 * std::exp( (p2-Tau)/p3-  std::exp( (p2-Tau) /p3) ); //ok
  
  G4double k1 = ParRT1+ParRT2*Zeff;                // ok
  G4double k2 = ParRT3;                            // ok
  G4double k3 = ParRT4;                            // ok
  G4double k4 = ParRT5+ParRT6* std::log(Energy/GeV);    // ok
  
  RadiusTail   = k1*(std::exp(k3*(Tau-k2))
               + std::exp(k4*(Tau-k2)) );            //ok

  // sampling calorimeter  

  RadiusCore   = RadiusCore + ParsRC1*(1-ehat) + ParsRC2/Fs*std::exp(-Tau); //ok
  WeightCore   = WeightCore + (1-ehat)
                            * (ParsWC1+ParsWC2/Fs * std::exp(-std::pow((Tau-1.),2))); //ok
  RadiusTail   = RadiusTail + (1-ehat)* ParsRT1+ ParsRT2/Fs *std::exp(-Tau);     //ok  
}

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G4double GFlashSamplingShowerParameterisation::ComputeTau ( G4double  LongitudinalPosition )

virtual

Implements GVFlashShowerParameterisation.

Definition at line 372 of file GFlashSamplingShowerParameterisation.cc.

{
  G4double tau = LongitudinalPosition / Tmax/ X0eff     //<t> = T* a /(a - 1) 
                 * (Alpha-1.00) /Alpha
                 * std::exp(AveLogAlpha)/(std::exp(AveLogAlpha)-1.);  //ok 
  return tau;
}

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void GFlashSamplingShowerParameterisation::ComputeZAX0EFFetc

(

)

Definition at line 174 of file GFlashSamplingShowerParameterisation.cc.

{
  G4cout << "/************ ComputeZAX0EFFetc ************/" << G4endl;
  G4cout << "  - GFlashSamplingShowerParameterisation::Material -  " << G4endl;

  G4double Es = 21*MeV; //constant

  // material and geometry parameters for a sampling calorimeter
  G4double denominator = (d1*density1 + d2*density2);
  G4double W1  = (d1*density1) / denominator;
  G4double W2  = (d2*density2) / denominator;
  Zeff   = ( W1*Z1 ) + ( W2*Z2 );    //X0*Es/Ec;
  Aeff   = ( W1*A1 ) + ( W2*A2 );
  X0eff  = ( 1./ ( ( W1 / X01) +( W2 / X02) ) ); 
  Rhoeff = ( (d1 *density1 ) + (d2 * density2 ))/G4double (d2  + d1  );
  Rmeff =  1/  ((((W1*Ec1)/ X01)   +   ((W2* Ec2)/  X02) ) / Es ) ;
  Eceff =  X0eff *((W1*Ec1)/ X01 + (W2* Ec2)/  X02 );      
  Fs =  X0eff/G4double ((d1/mm )+(d2/mm) );
  ehat = (1. / (1+ 0.007*(Z1- Z2)));

  G4cout << "W1= "  << W1 << G4endl;
  G4cout << "W2= " << W2 << G4endl;
  G4cout << "effective quantities Zeff = "<<Zeff<< G4endl;
  G4cout << "effective quantities Aeff = "<<Aeff<< G4endl;
  G4cout << "effective quantities Rhoeff = "<<Rhoeff/g *cm3<<" g/cm3"  << G4endl;
  G4cout << "effective quantities X0eff = "<<X0eff/cm <<" cm" << G4endl;

  X0eff = X0eff * Rhoeff;

  G4cout << "effective quantities X0eff = "<<X0eff/g*cm2 <<" g/cm2" << G4endl;  
  X0eff = X0eff /Rhoeff;
  G4cout << "effective quantities RMeff = "<<Rmeff/cm<<"  cm" << G4endl; 
  Rmeff = Rmeff* Rhoeff;
  G4cout << "effective quantities RMeff = "<<Rmeff/g *cm2<<" g/cm2" << G4endl;  
  Rmeff = Rmeff/ Rhoeff;
  G4cout << "effective quantities Eceff = "<<Eceff/MeV<< " MeV"<< G4endl;  
  G4cout << "effective quantities Fs = "<<Fs<<G4endl;
  G4cout << "effective quantities ehat = "<<ehat<<G4endl;
  G4cout << "/********************************************/ " <<G4endl; 
}

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G4double GFlashSamplingShowerParameterisation::GenerateExponential ( G4double  Energy )

virtual

Implements GVFlashShowerParameterisation.

Definition at line 412 of file GFlashSamplingShowerParameterisation.cc.

{
  G4double ParExp1 =  9./7.*X0eff;
  G4double random  = -ParExp1*G4RandExponential::shoot() ;
  return random;
}

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void GFlashSamplingShowerParameterisation::GenerateLongitudinalProfile ( G4double  Energy )

virtual

Implements GVFlashShowerParameterisation.

Definition at line 218 of file GFlashSamplingShowerParameterisation.cc.

{
  if ((material1==0) || (material2 ==0))
  {
    G4Exception("GFlashSamplingShowerParameterisation::GenerateLongitudinalProfile()",
                "InvalidSetup", FatalException, "No material initialized!");
  }  
  G4double y = Energy/Eceff;
  ComputeLongitudinalParameters(y);  
  GenerateEnergyProfile(y);
  GenerateNSpotProfile(y);
}

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G4double GFlashSamplingShowerParameterisation::GeneratePhi

(

)

G4double GFlashSamplingShowerParameterisation::GenerateRadius ( G4int  ispot, G4double  Energy, G4double  LongitudinalPosition  )

virtual

Implements GVFlashShowerParameterisation.

Definition at line 342 of file GFlashSamplingShowerParameterisation.cc.

{
  if(ispot < 1) 
  {
    // Determine lateral parameters in the middle of the step.
    // They depend on energy & position along step
    //
    G4double Tau = ComputeTau(LongitudinalPosition);
    ComputeRadialParameters(Energy,Tau);  
  }
  
  G4double Radius;
  G4double Random1 = G4UniformRand();
  G4double Random2 = G4UniformRand(); 
  if(Random1  <WeightCore) //WeightCore = p < w_i  
  {
    Radius = Rmeff * RadiusCore * std::sqrt( Random2/(1. - Random2) );
  }
  else
  {
    Radius = Rmeff * RadiusTail * std::sqrt( Random2/(1. - Random2) );
  }   
  Radius =  std::min(Radius,DBL_MAX);
  return Radius;
}

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G4double GFlashSamplingShowerParameterisation::GetAveR90 ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 74 of file GFlashSamplingShowerParameterisation.hh.

{return (1.5 * Rmeff);} //ok

G4double GFlashSamplingShowerParameterisation::GetAveR99 ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 73 of file GFlashSamplingShowerParameterisation.hh.

{return (3.5 * Rmeff);}

G4double GFlashSamplingShowerParameterisation::GetAveT90 ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 78 of file GFlashSamplingShowerParameterisation.hh.

{return (2.5* X0eff* std::exp( AveLogTmax));}

G4double GFlashSamplingShowerParameterisation::GetAveT99 ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 77 of file GFlashSamplingShowerParameterisation.hh.

{return (X0eff*AveLogTmax/(AveLogAlpha-1.00));}

G4double GFlashSamplingShowerParameterisation::GetAveTmx ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 76 of file GFlashSamplingShowerParameterisation.hh.

{return (X0eff*std::exp(AveLogTmax));}

G4double GFlashSamplingShowerParameterisation::GetEc ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 82 of file GFlashSamplingShowerParameterisation.hh.

{return Eceff;} 

G4double GFlashSamplingShowerParameterisation::GetNspot ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 80 of file GFlashSamplingShowerParameterisation.hh.

{return NSpot;}

G4double GFlashSamplingShowerParameterisation::GetRm ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 83 of file GFlashSamplingShowerParameterisation.hh.

{return Rmeff;} 

G4double GFlashSamplingShowerParameterisation::GetX0 ( )

inlinevirtual

Implements GVFlashShowerParameterisation.

Definition at line 81 of file GFlashSamplingShowerParameterisation.hh.

{return X0eff;}  

G4double GFlashSamplingShowerParameterisation::IntegrateEneLongitudinal ( G4double  LongitudinalStep )

virtual

Implements GVFlashShowerParameterisation.

Definition at line 316 of file GFlashSamplingShowerParameterisation.cc.

{
  G4double LongitudinalStepInX0 = LongitudinalStep / X0eff;
  G4float x1= Betah*LongitudinalStepInX0;
  G4float x2= Alphah;
  float x3 =  gam(x1,x2);
  G4double DEne=x3;
  return DEne;
}

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G4double GFlashSamplingShowerParameterisation::IntegrateNspLongitudinal ( G4double  LongitudinalStep )

virtual

Implements GVFlashShowerParameterisation.

Definition at line 329 of file GFlashSamplingShowerParameterisation.cc.

{
  G4double LongitudinalStepInX0 = LongitudinalStep / X0eff; 
  G4float x1 = BetaNSpot*LongitudinalStepInX0;
  G4float x2 = AlphaNSpot;
  G4float x3 =  gam(x1,x2);
  G4double DNsp = x3;
  return DNsp;
}

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void GFlashSamplingShowerParameterisation::SetMaterial	(	G4Material *	mat1,
		G4Material *	mat2
	)

Definition at line 151 of file GFlashSamplingShowerParameterisation.cc.

{
  G4double Es = 21*MeV;
  material1= mat1;
  Z1 = GetEffZ(material1);
  A1 = GetEffA(material1);
  density1 = material1->GetDensity();
  X01  = material1->GetRadlen();   
  Ec1      = 2.66 * std::pow((X01 * Z1 / A1),1.1); 
  Rm1 = X01*Es/Ec1;

  material2= mat2;
  Z2 = GetEffZ(material2);
  A2 = GetEffA(material2);
  density2 = material2->GetDensity();
  X02  = material2->GetRadlen();   
  Ec2      = 2.66 * std::pow((X02 * Z2 / A2),1.1); 
  Rm2 = X02*Es/Ec2; 
  // PrintMaterial(); 
}

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---

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

• source/geant4.10.03.p03/source/parameterisations/gflash/include/GFlashSamplingShowerParameterisation.hh
• source/geant4.10.03.p03/source/parameterisations/gflash/src/GFlashSamplingShowerParameterisation.cc