G4VPartonStringModel.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id: G4VPartonStringModel.cc 91858 2015-08-07 13:57:22Z gcosmo $
//
//      GEANT 4 class implementation file
//
//      ---------------- G4VPartonStringModel ----------------
//             by Gunter Folger, May 1998.
//      abstract class for all Parton String Models
// ------------------------------------------------------------
// debug switch
//#define debug_PartonStringModel
// ------------------------------------------------------------

#include "G4VPartonStringModel.hh"
#include "G4ios.hh"
#include "G4ShortLivedConstructor.hh"

#include "G4ParticleTable.hh"
#include "G4IonTable.hh"

G4VPartonStringModel::G4VPartonStringModel(const G4String& modelName)
    : G4VHighEnergyGenerator(modelName),
      stringFragmentationModel(0),
      theThis(0)
{
//  Make shure Shotrylived partyicles are constructed.
    G4ShortLivedConstructor ShortLived;
    ShortLived.ConstructParticle();
}

G4VPartonStringModel::~G4VPartonStringModel()
{
}

G4KineticTrackVector * G4VPartonStringModel::Scatter(const G4Nucleus &theNucleus, 
                                                const G4DynamicParticle &aPrimary)
{  
  G4ExcitedStringVector * strings = NULL;

  G4DynamicParticle thePrimary=aPrimary;

#ifdef debug_PartonStringModel
  G4cout<<G4endl;
  G4cout<<"-----------------------Parton-String model is runnung ------------"<<G4endl;
  G4cout<<"Projectile Name Mass "<<thePrimary.GetDefinition()->GetParticleName()<<" "
                                 <<thePrimary.GetMass()<<G4endl;
  G4cout<<"           Momentum  "<<thePrimary.Get4Momentum()<<G4endl;
  G4cout<<"Target nucleus   A Z "<<theNucleus.GetA_asInt()<<" "
                                 <<theNucleus.GetZ_asInt()<<G4endl<<G4endl; 
  G4int Bsum=thePrimary.GetDefinition()->GetBaryonNumber() + theNucleus.GetA_asInt();
  G4int Qsum=thePrimary.GetDefinition()->GetPDGCharge() + theNucleus.GetZ_asInt();
  G4cout<<"Initial baryon number "<<Bsum<<G4endl;
  G4cout<<"Initial charge        "<<Qsum<<G4endl;

  Bsum -= theNucleus.GetA_asInt();  Qsum -= theNucleus.GetZ_asInt();
  if(theThis->GetProjectileNucleus()) {
    Bsum -= thePrimary.GetDefinition()->GetBaryonNumber();
    Qsum -= thePrimary.GetDefinition()->GetPDGCharge();
  }
#endif

  G4LorentzRotation toZ;
  G4LorentzVector Ptmp=thePrimary.Get4Momentum();
  toZ.rotateZ(-1*Ptmp.phi());
  toZ.rotateY(-1*Ptmp.theta());
  thePrimary.Set4Momentum(toZ*Ptmp);
  G4LorentzRotation toLab(toZ.inverse());

  G4int attempts = 0, maxAttempts=20;
  while ( strings  == NULL )  /* Loop checking, 07.08.2015, A.Ribon */
  {
    if (attempts++ > maxAttempts ) 
    {
        throw G4HadronicException(__FILE__, __LINE__, 
            "G4VPartonStringModel::Scatter(): fails to generate strings");
    }
    theThis->Init(theNucleus,thePrimary);

    strings = GetStrings();
  }
  
  G4double stringEnergy(0);
  G4LorentzVector SumStringMom(0.,0.,0.,0.);

#ifdef debug_PartonStringModel
  G4cout<<"Parton-String model: Number of produced strings "<<strings->size()<<G4endl;
#endif

  for ( unsigned int astring=0; astring < strings->size(); astring++)
  {
//    rotate string to lab frame, models have it aligned to z
    if((*strings)[astring]->IsExcited())
    {
     stringEnergy += (*strings)[astring]->GetLeftParton()->Get4Momentum().t();
     stringEnergy += (*strings)[astring]->GetRightParton()->Get4Momentum().t();
     (*strings)[astring]->LorentzRotate(toLab);
     SumStringMom+=(*strings)[astring]->Get4Momentum();
#ifdef debug_PartonStringModel
G4cout<<"String No "<<astring+1<<" "<<(*strings)[astring]->Get4Momentum()<<" "
                                    <<(*strings)[astring]->Get4Momentum().mag()
     <<" Partons   "<<(*strings)[astring]->GetLeftParton()->GetDefinition()->GetPDGEncoding()
     <<"          "<<(*strings)[astring]->GetRightParton()->GetDefinition()->GetPDGEncoding()<<G4endl;
#endif
    }
    else
    {
     stringEnergy += (*strings)[astring]->GetKineticTrack()->Get4Momentum().t();
     (*strings)[astring]->LorentzRotate(toLab);
     SumStringMom+=(*strings)[astring]->GetKineticTrack()->Get4Momentum();
#ifdef debug_PartonStringModel
     G4cout<<"A track No "<<astring+1<<" "
           <<(*strings)[astring]->GetKineticTrack()->Get4Momentum()<<" "
           <<(*strings)[astring]->GetKineticTrack()->Get4Momentum().mag()<<" "
           <<(*strings)[astring]->GetKineticTrack()->GetDefinition()->GetParticleName()<<G4endl;
#endif
    }
  }
#ifdef debug_PartonStringModel
  G4cout<<G4endl<<"SumString4Mom "<<SumStringMom<<G4endl;

  G4LorentzVector TargetResidual4Momentum(0.,0.,0.,0.);
  G4LorentzVector ProjectileResidual4Momentum(0.,0.,0.,0.);
  G4int hitsT(0), charged_hitsT(0);
  G4int hitsP(0), charged_hitsP(0);
  G4double ExcitationEt(0.), ExcitationEp(0.);
#endif

  G4V3DNucleus * ProjResNucleus=theThis->GetProjectileNucleus();
  G4Nucleon * theNuclNucleon(0);

  if(ProjResNucleus != 0)
  {
    theNuclNucleon = ProjResNucleus->StartLoop() ?
                     ProjResNucleus->GetNextNucleon() : NULL;
    while( theNuclNucleon )  /* Loop checking, 07.08.2015, A.Ribon */
    {
     if(theNuclNucleon->AreYouHit())
     {
      G4LorentzVector tmp=toLab*theNuclNucleon->Get4Momentum();
      #ifdef debug_PartonStringModel
         ProjectileResidual4Momentum += tmp;
         hitsP++;
         if ( theNuclNucleon->GetDefinition() == G4Proton::Proton() )  ++charged_hitsP;
         ExcitationEp +=theNuclNucleon->GetBindingEnergy();
      #endif
      theNuclNucleon->SetMomentum(tmp);
     }
     theNuclNucleon = ProjResNucleus->GetNextNucleon();
    }
#ifdef debug_PartonStringModel
    G4cout<<"Projectile residual A, Z and E* "
          <<thePrimary.GetDefinition()->GetBaryonNumber() - hitsP<<" "
          <<thePrimary.GetDefinition()->GetPDGCharge()    - charged_hitsP<<" "
          <<ExcitationEp<<G4endl;
    G4cout<<"Projectile residual 4 momentum  "<<ProjectileResidual4Momentum<<G4endl;
#endif
  }

  G4V3DNucleus * ResNucleus=theThis->GetWoundedNucleus(); 

   // loop over wounded nucleus
  theNuclNucleon = ResNucleus->StartLoop() ?
                   ResNucleus->GetNextNucleon() : NULL;
  while( theNuclNucleon )  /* Loop checking, 07.08.2015, A.Ribon */
  {
     if(theNuclNucleon->AreYouHit())
     {
      G4LorentzVector tmp=toLab*theNuclNucleon->Get4Momentum();
      #ifdef debug_PartonStringModel
         TargetResidual4Momentum += tmp;
         hitsT++;
         if ( theNuclNucleon->GetDefinition() == G4Proton::Proton() )  ++charged_hitsT;
         ExcitationEt +=theNuclNucleon->GetBindingEnergy();
      #endif
      theNuclNucleon->SetMomentum(tmp);
     }
     theNuclNucleon = ResNucleus->GetNextNucleon();
  }
#ifdef debug_PartonStringModel
   G4cout<<"Target residual A, Z and E* "
         <<theNucleus.GetA_asInt() - hitsT<<" "
         <<theNucleus.GetZ_asInt() - charged_hitsT<<" "
         <<ExcitationEt<<G4endl;
   G4cout<<"Target residual 4 momentum "<<TargetResidual4Momentum<<G4endl;

   Bsum+=(        hitsT +         hitsP);
   Qsum+=(charged_hitsT + charged_hitsP);

   G4cout<<"Hitted # of nucleons of projectile and target "<<hitsP<<" "<<hitsT<<G4endl;
   G4cout<<"Hitted # of protons of projectile and target  "
         <<charged_hitsP<<" "<<charged_hitsT<<G4endl<<G4endl;
G4cout<<"Bsum Qsum "<<Bsum<<" "<<Qsum<<G4endl;
#endif

//=========================================================================================
//  Fragment strings

  G4KineticTrackVector * theResult = 0;
  G4double InvMass=SumStringMom.mag();
  G4double SumMass(0.); 
  attempts = 0; 
  maxAttempts=100;

  #ifdef debug_PartonStringModel
     G4LorentzVector SumPsecondr(0.,0.,0.,0.);
     G4int QsumSec(0), BsumSec(0);
  #endif

  do 
  {     
   attempts++;   
   if(theResult != 0)
   {
    std::for_each(theResult->begin(), theResult->end(), DeleteKineticTrack());
    delete theResult;
   }

   theResult = stringFragmentationModel->FragmentStrings(strings);

   if(attempts > maxAttempts ) break;

   #ifdef debug_PartonStringModel
      G4cout<<"Attempt to fragment the strings "<<attempts<<G4endl;
      G4cout<<"Parton-String model: Number of produced particles "<<theResult->size()<<G4endl;
      SumPsecondr = G4LorentzVector(0.,0.,0.,0.);
      QsumSec = 0; BsumSec = 0;
   #endif

   SumMass=0.;

   for ( unsigned int i=0; i < theResult->size(); i++)
   {
    SumMass+=(*theResult)[i]->Get4Momentum().mag();
    #ifdef debug_PartonStringModel
       G4cout<<i<<" : "<<(*theResult)[i]->GetDefinition()->GetParticleName()<<" "
                       <<(*theResult)[i]->Get4Momentum()<<" "
                       <<(*theResult)[i]->Get4Momentum().mag()<<" "
                       <<(*theResult)[i]->GetDefinition()->GetPDGMass()<<G4endl;
       SumPsecondr+=(*theResult)[i]->Get4Momentum();
       BsumSec += (*theResult)[i]->GetDefinition()->GetBaryonNumber();
       QsumSec += (*theResult)[i]->GetDefinition()->GetPDGCharge();
    #endif
   }

#ifdef debug_PartonStringModel
   if(Qsum != QsumSec) {
     G4cout<<"Charge is not conserved!!! ----"<<G4endl; 
     G4cout<<" Qsum != QsumSec "<<Qsum<<" "<<QsumSec<<G4endl;
   }
   if(Bsum != BsumSec) {
     G4cout<<"Baryon number is not conserved!!!"<<G4endl;
     G4cout<<" Bsum != BsumSec "<<Bsum<<" "<<BsumSec<<G4endl;
   }
#endif
  } while(SumMass > InvMass);  /* Loop checking, 07.08.2015, A.Ribon */

  std::for_each(strings->begin(), strings->end(), DeleteString() );
  delete strings;

#ifdef debug_PartonStringModel
  G4cout<<G4endl<<"Baryon number balance "<<Bsum-BsumSec<<G4endl;
  G4cout        <<"Charge balance        "<<Qsum-QsumSec<<G4endl;
  G4cout        <<"4 momentum balance    "<<SumStringMom-SumPsecondr<<G4endl; 
  G4cout<<"End of string model work ------------"<<G4endl<<G4endl;
#endif

  return theResult;
}

void G4VPartonStringModel::ModelDescription(std::ostream& outFile) const
{
    outFile << GetModelName() << " has no description yet.\n";
}

G4V3DNucleus * G4VPartonStringModel::GetProjectileNucleus() const 
{ return 0;}