G4PenelopeBremsstrahlungAngular.cc

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// $Id$
// 
// --------------------------------------------------------------
//
// File name:     G4PenelopeBremsstrahlungAngular
//
// Author:        Luciano Pandola
// 
// Creation date: November 2010
//
// History:
// -----------
// 23 Nov 2010  L. Pandola       1st implementation
// 24 May 2011  L. Pandola       Renamed (make v2008 as default Penelope)
// 13 Mar 2012  L. Pandola       Made a derived class of G4VEmAngularDistribution
//                               and update the interface accordingly
// 18 Jul 2012  L. Pandola       Migrated to the new basic interface of G4VEmAngularDistribution
//                               Now returns a G4ThreeVector and takes care of the rotation
//
//----------------------------------------------------------------

#include "G4PenelopeBremsstrahlungAngular.hh"

#include "globals.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicsFreeVector.hh"
#include "G4PhysicsTable.hh"
#include "G4Material.hh"
#include "Randomize.hh"

G4PenelopeBremsstrahlungAngular::G4PenelopeBremsstrahlungAngular() : 
  G4VEmAngularDistribution("Penelope"), theEffectiveZSq(0),
  theLorentzTables1(0),theLorentzTables2(0)
  
{
  dataRead = false;
  verbosityLevel = 0;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4PenelopeBremsstrahlungAngular::~G4PenelopeBremsstrahlungAngular()
{
  ClearTables();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

void G4PenelopeBremsstrahlungAngular::Initialize()
{
  ClearTables();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

void G4PenelopeBremsstrahlungAngular::ClearTables()
{
  std::map<G4double,G4PhysicsTable*>::iterator j;

  if (theLorentzTables1)
    {
      for (j=theLorentzTables1->begin(); j != theLorentzTables1->end(); j++)
        {
          G4PhysicsTable* tab = j->second;
          tab->clearAndDestroy();
          delete tab;
        }
      delete theLorentzTables1;
      theLorentzTables1 = 0;
    }

  if (theLorentzTables2)
    {
      for (j=theLorentzTables2->begin(); j != theLorentzTables2->end(); j++)
        {
          G4PhysicsTable* tab = j->second;
          tab->clearAndDestroy();
          delete tab;
        }
      delete theLorentzTables2;
      theLorentzTables2 = 0;
    }  
  if (theEffectiveZSq)
    {
      delete theEffectiveZSq;
      theEffectiveZSq = 0;
    }
}

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void G4PenelopeBremsstrahlungAngular::ReadDataFile()
{
   //Read information from DataBase file
  char* path = getenv("G4LEDATA");
  if (!path)
    {
      G4String excep = 
        "G4PenelopeBremsstrahlungAngular - G4LEDATA environment variable not set!";
      G4Exception("G4PenelopeBremsstrahlungAngular::ReadDataFile()",
                  "em0006",FatalException,excep);
      return;
    }
  G4String pathString(path);
  G4String pathFile = pathString + "/penelope/bremsstrahlung/pdbrang.p08";
  std::ifstream file(pathFile);
  
  if (!file.is_open())
    {
      G4String excep = "G4PenelopeBremsstrahlungAngular - data file " + pathFile + " not found!";
      G4Exception("G4PenelopeBremsstrahlungAngular::ReadDataFile()",
                  "em0003",FatalException,excep);
      return;
    }
  G4int i=0,j=0,k=0; // i=index for Z, j=index for E, k=index for K 

  for (k=0;k<NumberofKPoints;k++)    
    for (i=0;i<NumberofZPoints;i++)     
      for (j=0;j<NumberofEPoints;j++)
        {
          G4double a1,a2;
          G4int ik1,iz1,ie1; 
          G4double zr,er,kr;
          file >> iz1 >> ie1 >> ik1 >> zr >> er >> kr >> a1 >> a2;
          //check the data are correct
          if ((iz1-1 == i) && (ik1-1 == k) && (ie1-1 == j))
            {
              QQ1[i][j][k]=a1;
              QQ2[i][j][k]=a2;
            }
          else
            {        
              G4ExceptionDescription ed;
              ed << "Corrupted data file " << pathFile << "?" << G4endl;
              G4Exception("G4PenelopeBremsstrahlungAngular::ReadDataFile()",
                  "em0005",FatalException,ed);    
            }
        }   
  file.close();
  dataRead = true;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

void G4PenelopeBremsstrahlungAngular::PrepareInterpolationTables(G4double Zmat)
{
  //Check if data file has already been read
  if (!dataRead)
    {
      ReadDataFile();
      if (!dataRead)    
        G4Exception("G4PenelopeBremsstrahlungAngular::PrepareInterpolationTables()",
                    "em2001",FatalException,"Unable to build interpolation table");
    }

  const G4int reducedEnergyGrid=21;
  //Support arrays. 
  G4double betas[NumberofEPoints]; //betas for interpolation
  //tables for interpolation
  G4double Q1[NumberofEPoints][NumberofKPoints];
  G4double Q2[NumberofEPoints][NumberofKPoints];
  //expanded tables for interpolation
  G4double Q1E[NumberofEPoints][reducedEnergyGrid];
  G4double Q2E[NumberofEPoints][reducedEnergyGrid]; 
  G4double pZ[NumberofZPoints] = {2.0,8.0,13.0,47.0,79.0,92.0};

  G4int i=0,j=0,k=0; // i=index for Z, j=index for E, k=index for K 
  //Interpolation in Z
  for (i=0;i<NumberofEPoints;i++)
    {
      for (j=0;j<NumberofKPoints;j++)
        {
          G4PhysicsFreeVector* QQ1vector = new G4PhysicsFreeVector(NumberofZPoints);
          QQ1vector->SetSpline(true);
          G4PhysicsFreeVector* QQ2vector = new G4PhysicsFreeVector(NumberofZPoints);
          QQ2vector->SetSpline(true);

          //fill vectors
          for (k=0;k<NumberofZPoints;k++)
            {
              QQ1vector->PutValue(k,pZ[k],std::log(QQ1[k][i][j]));
              QQ2vector->PutValue(k,pZ[k],QQ2[k][i][j]);
            }
          
          Q1[i][j]= std::exp(QQ1vector->Value(Zmat));     
          Q2[i][j]=QQ2vector->Value(Zmat);
          delete QQ1vector;
          delete QQ2vector;
        }
    }
  G4double pE[NumberofEPoints] = {1.0e-03*MeV,5.0e-03*MeV,1.0e-02*MeV,5.0e-02*MeV,
                                  1.0e-01*MeV,5.0e-01*MeV};
  G4double pK[NumberofKPoints] = {0.0,0.6,0.8,0.95};
  G4double ppK[reducedEnergyGrid]; 

  for(i=0;i<reducedEnergyGrid;i++)
    ppK[i]=((G4double) i) * 0.05;
  

  for(i=0;i<NumberofEPoints;i++)
    betas[i]=std::sqrt(pE[i]*(pE[i]+2*electron_mass_c2))/(pE[i]+electron_mass_c2);
  

  for (i=0;i<NumberofEPoints;i++)
    {
      for (j=0;j<NumberofKPoints;j++)
        Q1[i][j]=Q1[i][j]/Zmat;
    }

  //Expanded table of distribution parameters
  for (i=0;i<NumberofEPoints;i++)
    {
      G4PhysicsFreeVector* Q1vector = new G4PhysicsFreeVector(NumberofKPoints);    
      G4PhysicsFreeVector* Q2vector = new G4PhysicsFreeVector(NumberofKPoints);

      for (j=0;j<NumberofKPoints;j++)
        {
          Q1vector->PutValue(j,pK[j],std::log(Q1[i][j])); //logarithmic 
          Q2vector->PutValue(j,pK[j],Q2[i][j]);
        }

      for (j=0;j<reducedEnergyGrid;j++)
        {
          Q1E[i][j]=Q1vector->Value(ppK[j]);
          Q2E[i][j]=Q2vector->Value(ppK[j]);
        }
      delete Q1vector;
      delete Q2vector;
    } 
  //
  //TABLES to be stored
  //
  G4PhysicsTable* theTable1 = new G4PhysicsTable();
  G4PhysicsTable* theTable2 = new G4PhysicsTable();
  // the table will contain reducedEnergyGrid G4PhysicsFreeVectors with different
  // values of k, 
  // Each of the G4PhysicsFreeVectors has a profile of
  // y vs. E
  //
  //reserve space of the vectors.
  for (j=0;j<reducedEnergyGrid;j++)   
    {
      G4PhysicsFreeVector* thevec = new G4PhysicsFreeVector(NumberofEPoints);
      thevec->SetSpline(true);
      theTable1->push_back(thevec);
      G4PhysicsFreeVector* thevec2 = new G4PhysicsFreeVector(NumberofEPoints);
      thevec2->SetSpline(true);
      theTable2->push_back(thevec2);
    }  

  for (j=0;j<reducedEnergyGrid;j++)
    {
      G4PhysicsFreeVector* thevec = (G4PhysicsFreeVector*) (*theTable1)[j];
      G4PhysicsFreeVector* thevec2 = (G4PhysicsFreeVector*) (*theTable2)[j];
      for (i=0;i<NumberofEPoints;i++)
        {
          thevec->PutValue(i,betas[i],Q1E[i][j]);
          thevec2->PutValue(i,betas[i],Q2E[i][j]);
        }
    }

  if (theLorentzTables1 && theLorentzTables2)
    {
      theLorentzTables1->insert(std::make_pair(Zmat,theTable1));
      theLorentzTables2->insert(std::make_pair(Zmat,theTable2));
    }
  else
    {
      G4ExceptionDescription ed;
      ed << "Unable to create tables of Lorentz coefficients for " << G4endl;
      ed << "<Z>= "  << Zmat << " in G4PenelopeBremsstrahlungAngular" << G4endl;
      delete theTable1;
      delete theTable2;
      G4Exception("G4PenelopeBremsstrahlungAngular::PrepareInterpolationTables()",
                  "em2005",FatalException,ed);  
    }
  
  return;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4ThreeVector& G4PenelopeBremsstrahlungAngular::SampleDirection(const G4DynamicParticle* dp,
                                                                G4double eGamma,
                                                                G4int,
                                                                const G4Material* material)
{
  if (!material)
    {
      G4Exception("G4PenelopeBremsstrahlungAngular::SampleDirection()",
                  "em2040",FatalException,"The pointer to G4Material* is NULL");
      return fLocalDirection;
    }
  
  G4double Zmat = GetEffectiveZ(material);
  if (verbosityLevel > 0)
    {
      G4cout << "Effective <Z> for material : " << material->GetName() << 
        " = " << Zmat << G4endl;
    }

  G4double ePrimary = dp->GetKineticEnergy();

  G4double beta = std::sqrt(ePrimary*(ePrimary+2*electron_mass_c2))/
    (ePrimary+electron_mass_c2);
  G4double cdt = 0;
  G4double sinTheta = 0;
  G4double phi = 0;

  //Use a pure dipole distribution for energy above 500 keV
  if (ePrimary > 500*keV)
    {
      cdt = 2.0*G4UniformRand() - 1.0;
      if (G4UniformRand() > 0.75)
        {
          if (cdt<0)
            cdt = -1.0*std::pow(-cdt,1./3.);
          else
            cdt = std::pow(cdt,1./3.);
        }
      cdt = (cdt+beta)/(1.0+beta*cdt);
      //Get primary kinematics
      sinTheta = std::sqrt(1. - cdt*cdt);
      phi  = twopi * G4UniformRand(); 
      fLocalDirection.set(sinTheta* std::cos(phi),
                      sinTheta* std::sin(phi),
                      cdt);
      //rotate
      fLocalDirection.rotateUz(dp->GetMomentumDirection());
      //return
      return fLocalDirection;
    }
  
  //Else, retrieve tables and go through the full thing
  if (!theLorentzTables1)
      theLorentzTables1 = new std::map<G4double,G4PhysicsTable*>;
  if (!theLorentzTables2)
    theLorentzTables2 = new std::map<G4double,G4PhysicsTable*>;

  //Check if tables exist for the given Zmat
  if (!(theLorentzTables1->count(Zmat)))
    PrepareInterpolationTables(Zmat);

  if (!(theLorentzTables1->count(Zmat)) || !(theLorentzTables2->count(Zmat)))
    {
      G4ExceptionDescription ed;
      ed << "Unable to retrieve Lorentz tables for Z= " << Zmat << G4endl;
      G4Exception("G4PenelopeBremsstrahlungAngular::SampleDirection()",
                  "em2006",FatalException,ed);
    }
    
  //retrieve actual tables
  G4PhysicsTable* theTable1 = theLorentzTables1->find(Zmat)->second;
  G4PhysicsTable* theTable2 = theLorentzTables2->find(Zmat)->second;
      
  G4double RK=20.0*eGamma/ePrimary;
  G4int ik=std::min((G4int) RK,19);
  
  G4double P10=0,P11=0,P1=0;
  G4double P20=0,P21=0,P2=0;

  //First coefficient
  G4PhysicsFreeVector* v1 = (G4PhysicsFreeVector*) (*theTable1)[ik];
  G4PhysicsFreeVector* v2 = (G4PhysicsFreeVector*) (*theTable1)[ik+1];
  P10 = v1->Value(beta);
  P11 = v2->Value(beta);
  P1=P10+(RK-(G4double) ik)*(P11-P10);
  
  //Second coefficient
  G4PhysicsFreeVector* v3 = (G4PhysicsFreeVector*) (*theTable2)[ik];
  G4PhysicsFreeVector* v4 = (G4PhysicsFreeVector*) (*theTable2)[ik+1];
  P20=v3->Value(beta); 
  P21=v4->Value(beta);
  P2=P20+(RK-(G4double) ik)*(P21-P20);
  
  //Sampling from the Lorenz-trasformed dipole distributions
  P1=std::min(std::exp(P1)/beta,1.0);
  G4double betap = std::min(std::max(beta*(1.0+P2/beta),0.0),0.9999);
  
  G4double testf=0;
  
  if (G4UniformRand() < P1)
    {
      do{
        cdt = 2.0*G4UniformRand()-1.0;
        testf=2.0*G4UniformRand()-(1.0+cdt*cdt);
      }while(testf>0);
    }
  else
    {
      do{
        cdt = 2.0*G4UniformRand()-1.0;
        testf=G4UniformRand()-(1.0-cdt*cdt);
      }while(testf>0);
    }
  cdt = (cdt+betap)/(1.0+betap*cdt);

  //Get primary kinematics
  sinTheta = std::sqrt(1. - cdt*cdt);
  phi  = twopi * G4UniformRand(); 
  fLocalDirection.set(sinTheta* std::cos(phi),
                      sinTheta* std::sin(phi),
                      cdt);
  //rotate
  fLocalDirection.rotateUz(dp->GetMomentumDirection());
  //return
  return fLocalDirection;
  
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4double G4PenelopeBremsstrahlungAngular::PolarAngle(const G4double ,
                                                     const G4double ,
                                                     const G4int )
{
  G4cout << "WARNING: G4PenelopeBremsstrahlungAngular() does NOT support PolarAngle()" << G4endl;
  G4cout << "Please use the alternative interface SampleDirection()" << G4endl;
  G4Exception("G4PenelopeBremsstrahlungAngular::PolarAngle()",
              "em0005",FatalException,"Unsupported interface");  
  return 0;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4double G4PenelopeBremsstrahlungAngular::GetEffectiveZ(const G4Material* material)
{
  if (!theEffectiveZSq)    
    theEffectiveZSq = new std::map<const G4Material*,G4double>;
    
  //found in the table: return it 
  if (theEffectiveZSq->count(material))
    return theEffectiveZSq->find(material)->second; 

  //not found: calculate and return
  //Helper for the calculation
  std::vector<G4double> *StechiometricFactors = new std::vector<G4double>;
  G4int nElements = material->GetNumberOfElements();
  const G4ElementVector* elementVector = material->GetElementVector();
  const G4double* fractionVector = material->GetFractionVector();
  for (G4int i=0;i<nElements;i++)
    {
      G4double fraction = fractionVector[i];
      G4double atomicWeigth = (*elementVector)[i]->GetA()/(g/mole);
      StechiometricFactors->push_back(fraction/atomicWeigth);
    }      
  //Find max
  G4double MaxStechiometricFactor = 0.;
  for (G4int i=0;i<nElements;i++)
    {
      if ((*StechiometricFactors)[i] > MaxStechiometricFactor)
        MaxStechiometricFactor = (*StechiometricFactors)[i];
    }
  //Normalize
  for (G4int i=0;i<nElements;i++)
    (*StechiometricFactors)[i] /=  MaxStechiometricFactor;
  
  G4double sumz2 = 0;
  G4double sums = 0;
  for (G4int i=0;i<nElements;i++)
    {
      G4double Z = (*elementVector)[i]->GetZ();
      sumz2 += (*StechiometricFactors)[i]*Z*Z;
      sums  += (*StechiometricFactors)[i];
    }  
  delete StechiometricFactors;

  G4double ZBR = std::sqrt(sumz2/sums);  
  theEffectiveZSq->insert(std::make_pair(material,ZBR));

  return ZBR;
}

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