/data/refman/pasoursint/CMSSW_6_1_2_SLHC2_patch1/src/CondTools/Ecal/src/EvolutionECAL.cc

Go to the documentation of this file.

#include "CondTools/Ecal/interface/EvolutionECAL.h"


// destructor 

EvolutionECAL::~EvolutionECAL()
{
}

// constructor 
EvolutionECAL::EvolutionECAL()
{
}

//_____________________________________________________
double EvolutionECAL::LightCollectionEfficiency(double z, double mu)
{
  double f = 0;
  if(z<=0) return f;
  if(z>=0.22) return f;
  
  double e0 =  6.91563e-02;
  double e1 =  1.64406e+00;
  double e2 =  6.42509e-01;
  double E =  e0/(1+exp(e1*(log10(mu)-e2)));

  double d0 =  3.85334e-01;
  double d1 = -1.04647e-02;
  double D = d0*exp(d1*mu);

  double c0 =  3.77629e-01;
  double c1 = -3.23755e-01;
  double c2 =  1.50247e+00;
  double c3 =  3.03278e-01;
  double C =  -1 + c0*exp(c1*mu)*(1+c2*exp(c3*mu));

  double b0 = -3.33575e-01;
  double b1 =  4.44856e-01;
  double b2 =  1.91766e+00;
  double b3 =  2.69423e+00;
  double b4 =  1.06905e+00;
  double B =  (1/mu)*(b0 + b1*log10(mu) + b2*pow(log10(mu),2) 
                      + b3*pow(log10(mu),3) + b4*pow(log10(mu),4));

  double a0 = 7.18248e-02; 
  double a1 = 1.89016e+00;
  double a2 = 2.15651e-02;
  double a3 = 2.30786e-02;
  double A =  exp(B*mu*0.015)*(a0/(exp(a1*(log10(mu)+a2))+1)+a3);

  double R = 0.01*D*( 4/(0.222+E)/(0.222+E) - 1/((0.22-z)*(z+E)) );
  f =  A * exp(-B*mu*(0.22-z)) * (1+C*exp(R));
  
  return f;
}


//_____________________________________________________
//
// This function is for CMSSW FullSim "slope_LY"
// It returns weight<=1 for light collection from relative distance "z"
//   0 < z < 1
//   z = 0 at the face of a crystal
//   z = 1 at the photo-detector
//   weight = 1 for undamaged crystal at any z
//
double EvolutionECAL::LightCollectionEfficiencyWeighted(double z, double mu_ind)
{
  if(z<=0) return 0;
  if(z>=1) return 0;
  if(mu_ind<0) return 1;

  double mu = mu_ind + 0.1; 
  double lmu = log10(mu);
  
  double e0 =  6.91563e-02;
  double e1 =  1.64406e+00;
  double e2 =  6.42509e-01;
  double E =  e0/(1+exp(e1*(lmu-e2)));

  double d0 =  3.85334e-01;
  double d1 = -1.04647e-02;
  double D = d0*exp(d1*mu);

  double c0 =  3.77629e-01;
  double c1 = -3.23755e-01;
  double c2 =  1.50247e+00;
  double c3 =  3.03278e-01;
  double C =  -1 + c0*exp(c1*mu)*(1+c2*exp(c3*mu));

  double b0 = -3.33575e-01;
  double b1 =  4.44856e-01;
  double b2 =  1.91766e+00;
  double b3 =  2.69423e+00;
  double b4 =  1.06905e+00;
  double B =  (1/mu)*(b0 + b1*lmu + b2*pow(lmu,2) 
                         + b3*pow(lmu,3) + b4*pow(lmu,4));

  double a0 = 7.18248e-02; 
  double a1 = 1.89016e+00;
  double a2 = 2.15651e-02;
  double a3 = 2.30786e-02;
  double A =  exp(B*mu*0.015)*(a0/(exp(a1*(lmu+a2))+1)+a3);

  double R = 0.01*D*( 4/(0.222+E)/(0.222+E) - 1/((0.22*0.22)*(1.-z)*(z+E/0.22)) );

  // for undamaged crystal, mu0 = 0.1
  double A0 =  0.0845209;
  double B0 = -4.85951;
  double C0 = -0.0681855;
  double D0 =  0.384931;
  double E0 =  0.0648029;
  double R0 = 0.01*D0*( 4/(0.222+E0)/(0.222+E0) - 1/((0.22*0.22)*(1.-z)*(z+E0/0.22)) );
  
  
  double f =  A/A0 * exp(-(B*mu-B0*0.1)*0.22*(1.-z)) * (1+C*exp(R))/(1+C0*exp(R0));
  
  return f;
}



//_________________________________________________________
double EvolutionECAL::DamageProfileEta(double eta)
{
  double x = fabs(eta);
  if(x<1.497){
    return exp( -4.11065 + 0.258478*x );
  }else{
    return exp( -13.5112 + 7.913860*x - 0.998649*x*x );
  }
}


//_________________________________________________________
double EvolutionECAL::DamageProfileEtaAPD(double eta)
{
  double x = fabs(eta);
  if(x<1.497){
    double et=x/1.48*34.0;
    double etaprof=( 9.54827 + et*0.0379222 + 
                     et*et*(-0.00257047) + 
                     et*et*et*0.00073546 + 
                     et*et*et*et*(-1.49683e-05)
                     )/9.54827;
    return etaprof;
  }else{
    return 1.0;
  }
}


//_________________________________________________________
double EvolutionECAL::InducedAbsorptionHadronic(double lumi, double eta)
{
  double fluence = DamageProfileEta(eta) * 2.7e+13/500.0 * lumi;
  double mu = 2.08E-13 * pow( fluence, 1.0049);
  return mu;
}


//_________________________________________________________
double EvolutionECAL::DoseLongitudinalProfile(double z)
{
  double alpha = 4.72877e+00;
  double beta  = 5.91296e-01;
  double amp1  = 6.24495e+02;
  double amp2  = 1.84367e-01;
  double offset   = 2.00705e+01;
  if (z>=0.0 && z<=22.0) {
    double term1 = (amp1 / TMath::Gamma(alpha)) * pow((beta*z),(alpha-1)) * exp (-beta*z);
    double term2 = amp2*(z-11.0)*(z-11.0) + offset;
    return (term1 + term2)/150.44;
  } else {       
   return 0;
  }
}



//_________________________________________________________
Double_t EvolutionECAL::EquilibriumFractionColorCentersEM(double *x, double *par)
{
  double instantLumi = par[0];
  double eta = par[1];
  double rate =  DoseLongitudinalProfile(x[0])*5.0*DamageProfileEta(eta)*instantLumi/1e+34;
  if(rate<=0.0) rate=0.0;
  double alpha = par[2];
  return rate/(alpha + rate);
}


 

//____________________________________________________________
double EvolutionECAL::InducedAbsorptionEM(double lumi, double eta)
{
  double mu_max  = 2.0;
  double alpha1  = 3.41488e+00;
  
  TF1 *ftmp1 = new TF1("ftmp1",this,&EvolutionECAL::EquilibriumFractionColorCentersEM,
                       0.0,22.0,3,"EvolutionECAL" , "EquilibriumFractionColorCentersEM");
  ftmp1->SetParameters(lumi, eta, alpha1);
  double muEM = mu_max*ftmp1->Integral(0.0, 22.0)/22.0;
  
  delete ftmp1; 
  return muEM;
}


//_____________________________________________________________
double EvolutionECAL::DegradationMeanEM50GeV(double mu)
{
  double retval = 1.0;
  double x = mu;
  if( x<1e-4   ) return retval;
  if( x>=200.0 ) x=200.0;  // parameterization is not valid for large mu

  double par[11] = {  1.00000e+01,
                     -4.41441e-01, 7.08607e-02, -3.75572e-01, -3.60410e-01, 1.30130e-01,
                     -4.72350e-01, 3.36315e-01, -1.19872e-01,  1.99574e-02,-1.22910e-03  };


  double alpha = par[0];

  double f1 = par[1]*x + par[2]*x*x;  
  double u = log(x);
  double f2 = par[10];
  for(int i=9; i>=3; i--) f2 = par[i] + f2*u;

  retval = f1/(1.0+exp(alpha*u)) + f2/(1.0+exp(-alpha*u));
  retval = exp(retval);
  return retval;
  

}




//_____________________________________________________________
double EvolutionECAL::DegradationNonLinearityEM50GeV(double mu, double ene)
{
  if(ene<=1e-3) return 0.0;

  double x = mu;
  if( mu<=0.06  ) x=0.06;
  if( mu>=150.0 ) x=150.0;

  double par[9] = { 5.17712e-03, 1.97597e-02, 3.36596e-02, 2.84505e-02, 1.38480e-02,
                    1.11498e-02, 7.73634e-03, -1.30767e-03, -2.20628e-03 };

  double u = log10(x);
  double slope = par[8];
  for(int i=7; i>=0; i--) slope = par[i] + slope*u;

  double retval = 1.0 + slope*log10(ene/50.0);
  if(retval<=0.0) retval = 0.0;
  return retval;

}


//_____________________________________________________________
double EvolutionECAL::ResolutionConstantTermEM50GeV(double mu)
{

  double x = mu;
  if( mu<=0.01  ) x=0.01;
  if( mu>=200.0 ) x=200.0;

  double par[10] = { -6.21503e+00,  1.59759e+00, -4.75221e-02, -3.90299e-02,  3.97269e-03,
                      2.29574e-03, -1.05280e-04, -9.60963e-05, -1.29594e-06,  1.70850e-06  };

  double u = log(x);
  double f = par[9];
  for(int i=8; i>=0; i--) f = par[i] + f*u;
  return exp(f);

}


//__________________________________________________________
double EvolutionECAL::ChargeVPTCathode(double instLumi, double eta, double integralLumi)
{
  double charge = 0.0;
  double tmpLumi = 0.0;
  double stepLumi = 1.0;
  double muEM = InducedAbsorptionEM(instLumi, eta);
  while(tmpLumi<integralLumi)
    {
      tmpLumi += stepLumi;  
      double muHD = InducedAbsorptionHadronic(tmpLumi, eta);
      double SS0 = DegradationMeanEM50GeV(muEM+muHD);
      charge += SS0*0.26e-3*DamageProfileEta(eta)*stepLumi;
    }
  return charge;
}





//_________________________________________________________
double EvolutionECAL::AgingVPT(double instLumi, double integralLumi, double eta) 
{
  if(fabs(eta)<1.497) return 1.0;
  double Q = ChargeVPTCathode(instLumi, eta, integralLumi);
  double result = 0.772+0.228*(3.94304e-01*exp(-Q/5.99232e-04)+(1-3.94304e-01)*exp(-Q/1.58243e-02));
  return result;
}



//_________________________________________________________
double EvolutionECAL::NoiseFactorFE(double lumi, double eta)
{
  double  x = fabs(eta);
  if(x<1.497){
    return sqrt( 1.0 + 0.495*0.03512*lumi*DamageProfileEtaAPD(eta));
  }else{
    return 1.0;
  } 
}