G4Track.cc

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// $Id$
//
//
//---------------------------------------------------------------
//
//  G4Track.cc
//
//---------------------------------------------------------------
//   Add copy constructor            Hisaya Feb. 07 01
//   Fix GetVelocity                 Hisaya Feb. 17 01
//   Modification for G4TouchableHandle             22 Oct. 2001  R.Chytracek//
//   Fix GetVelocity (bug report #741)   Horton-Smith Apr 14 2005
//   Remove massless check in  GetVelocity   02 Apr. 09 H.Kurashige
//   Use G4VelocityTable                     17 AUg. 2011 H.Kurashige

#include "G4Track.hh"
#include "G4PhysicalConstants.hh"
#include "G4ParticleTable.hh"
#include "G4VelocityTable.hh"

#include <iostream>
#include <iomanip>

G4Allocator<G4Track> aTrackAllocator;

G4VelocityTable*  G4Track::velTable=0;

G4Track::G4Track(G4DynamicParticle* apValueDynamicParticle,
                 G4double aValueTime,
                 const G4ThreeVector& aValuePosition)
  : fCurrentStepNumber(0),    fPosition(aValuePosition),
    fGlobalTime(aValueTime),  fLocalTime(0.),
    fTrackLength(0.),
    fParentID(0),             fTrackID(0),
    fVelocity(c_light),
    fpDynamicParticle(apValueDynamicParticle),
    fTrackStatus(fAlive),
    fBelowThreshold(false),   fGoodForTracking(false),
    fStepLength(0.0),         fWeight(1.0),
    fpStep(0),
    fVtxKineticEnergy(0.0),
    fpLVAtVertex(0),          fpCreatorProcess(0),
    fpUserInformation(0),
    prev_mat(0),  groupvel(0),
    prev_velocity(0.0), prev_momentum(0.0),
    is_OpticalPhoton(false),
    useGivenVelocity(false)
{    
  static G4bool isFirstTime = true;
  static G4ParticleDefinition* fOpticalPhoton =0;
  if ( isFirstTime ) {
    isFirstTime = false;
    // set  fOpticalPhoton
    fOpticalPhoton = G4ParticleTable::GetParticleTable()->FindParticle("opticalphoton");
  }
  // check if the particle type is Optical Photon
  is_OpticalPhoton = (fpDynamicParticle->GetDefinition() == fOpticalPhoton);

  if (velTable ==0 ) velTable = G4VelocityTable::GetVelocityTable();

  fVelocity = CalculateVelocity();

}

G4Track::G4Track()
  : fCurrentStepNumber(0),    
    fGlobalTime(0),           fLocalTime(0.),
    fTrackLength(0.),
    fParentID(0),             fTrackID(0),
    fVelocity(c_light),
    fpDynamicParticle(0),
    fTrackStatus(fAlive),
    fBelowThreshold(false),   fGoodForTracking(false),
    fStepLength(0.0),         fWeight(1.0),
    fpStep(0),
    fVtxKineticEnergy(0.0),
    fpLVAtVertex(0),          fpCreatorProcess(0),
    fpUserInformation(0),
    prev_mat(0),  groupvel(0),
    prev_velocity(0.0), prev_momentum(0.0),
    is_OpticalPhoton(false),
    useGivenVelocity(false)
{
}
G4Track::G4Track(const G4Track& right)
  : fCurrentStepNumber(0),    
    fGlobalTime(0),           fLocalTime(0.),
    fTrackLength(0.),
    fParentID(0),             fTrackID(0),
    fVelocity(c_light),
    fpDynamicParticle(0),
    fTrackStatus(fAlive),
    fBelowThreshold(false),   fGoodForTracking(false),
    fStepLength(0.0),         fWeight(1.0),
    fpStep(0),
    fVtxKineticEnergy(0.0),
    fpLVAtVertex(0),          fpCreatorProcess(0),
    fpUserInformation(0),
    prev_mat(0),  groupvel(0),
    prev_velocity(0.0), prev_momentum(0.0),
    is_OpticalPhoton(false),
    useGivenVelocity(false)
{
  *this = right;
}

G4Track::~G4Track()
{
   delete fpDynamicParticle;
   delete fpUserInformation;
}

G4Track & G4Track::operator=(const G4Track &right)
{
  if (this != &right) {
   fPosition = right.fPosition;
   fGlobalTime = right.fGlobalTime;
   fLocalTime = right.fLocalTime;
   fTrackLength = right.fTrackLength;
   fWeight = right.fWeight;
   fStepLength = right.fStepLength;

   // Track ID (and Parent ID) is not copied and set to zero for new track
   fTrackID = 0;
   fParentID =0;

   // CurrentStepNumber is set to be 0
   fCurrentStepNumber = 0;

   // velocity information 
   fVelocity = right.fVelocity;

   // dynamic particle information 
   fpDynamicParticle = new G4DynamicParticle(*(right.fpDynamicParticle));
 
   // track status and flags for tracking  
   fTrackStatus = right.fTrackStatus;
   fBelowThreshold = right.fBelowThreshold;
   fGoodForTracking = right.fGoodForTracking;
   
   // Step information (Step Length, Step Number, pointer to the Step,) 
   // are not copied
   fpStep=0;

   // vertex information
   fVtxPosition = right.fVtxPosition;
   fpLVAtVertex = right.fpLVAtVertex;
   fVtxKineticEnergy = right.fVtxKineticEnergy;
   fVtxMomentumDirection = right.fVtxMomentumDirection;

   // CreatorProcess and UserInformation are not copied 
   fpCreatorProcess = 0;
   fpUserInformation = 0;

   prev_mat = right.prev_mat;
   groupvel = right.groupvel;
   prev_velocity = right.prev_velocity;
   prev_momentum = right.prev_momentum;

   is_OpticalPhoton = right.is_OpticalPhoton;
   useGivenVelocity = right.useGivenVelocity; 
  }
  return *this;
}

void G4Track::CopyTrackInfo(const G4Track& right)
{
  *this = right;
}

G4double G4Track::CalculateVelocity() const
{ 
  if (useGivenVelocity) return fVelocity;    

  G4double velocity = c_light ;
  
  G4double mass = fpDynamicParticle->GetMass();

  // special case for photons
  if ( is_OpticalPhoton ) return CalculateVelocityForOpticalPhoton();

  // particles other than optical photon
  if (mass<DBL_MIN) {
    // Zero Mass
    velocity = c_light;
  } else {
    G4double T = (fpDynamicParticle->GetKineticEnergy())/mass;
    if (T > GetMaxTOfVelocityTable()) {
      velocity = c_light;
    } else if (T<DBL_MIN) {
      velocity =0.;
    } else if (T<GetMinTOfVelocityTable()) {
      velocity = c_light*std::sqrt(T*(T+2.))/(T+1.0);
    } else {    
      velocity = velTable->Value(T);
    }
    
  }                                                                             
  return velocity ;
}

G4double G4Track::CalculateVelocityForOpticalPhoton() const
{ 
    
  G4double velocity = c_light ;
  

  G4Material* mat=0; 
  G4bool update_groupvel = false;
  if ( fpStep !=0  ){
    mat= this->GetMaterial();         //   Fix for repeated volumes
  }else{
    if (fpTouchable!=0){ 
      mat=fpTouchable->GetVolume()->GetLogicalVolume()->GetMaterial();
    }
  }
  // check if previous step is in the same volume
    //  and get new GROUPVELOCITY table if necessary 
  if ((mat != 0) && ((mat != prev_mat)||(groupvel==0))) {
    groupvel = 0;
    if(mat->GetMaterialPropertiesTable() != 0)
      groupvel = mat->GetMaterialPropertiesTable()->GetProperty("GROUPVEL");
    update_groupvel = true;
  }
  prev_mat = mat;
  
  if  (groupvel != 0 ) {
    // light velocity = c/(rindex+d(rindex)/d(log(E_phot)))
    // values stored in GROUPVEL material properties vector
    velocity =  prev_velocity;
    
    // check if momentum is same as in the previous step
    //  and calculate group velocity if necessary 
    G4double current_momentum = fpDynamicParticle->GetTotalMomentum();
    if( update_groupvel || (current_momentum != prev_momentum) ) {
      velocity =
    groupvel->Value(current_momentum);
      prev_velocity = velocity;
      prev_momentum = current_momentum;
    }
  }   
  
  return velocity ;
}

void G4Track::SetVelocityTableProperties(G4double t_max, G4double t_min, G4int nbin)
{
  G4VelocityTable::SetVelocityTableProperties(t_max, t_min, nbin);
  velTable = G4VelocityTable::GetVelocityTable();
}

G4double G4Track::GetMaxTOfVelocityTable()
{ return G4VelocityTable::GetMaxTOfVelocityTable();}

G4double G4Track::GetMinTOfVelocityTable() 
{ return G4VelocityTable::GetMinTOfVelocityTable();}

G4int    G4Track::GetNbinOfVelocityTable() 
{ return G4VelocityTable::GetNbinOfVelocityTable();}