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geant4/source/processes/electromagnetic/xrays/src/G4SynchrotronRadiationInMat.cc
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//
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// * technical work of the GEANT4 collaboration. *
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//
// $Id: G4SynchrotronRadiationInMat.cc,v 1.2 2006/06/29 19:56:17 gunter Exp $
// GEANT4 tag $Name: geant4-08-01 $
//
// --------------------------------------------------------------
// GEANT 4 class implementation file
// CERN Geneva Switzerland
//
// History: first implementation,
// 21-5-98 V.Grichine
// 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
// 04.03.05, V.Grichine: get local field interface
// 19-05-06, V.Ivanchenko rename from G4SynchrotronRadiation
//
//
///////////////////////////////////////////////////////////////////////////
#include "G4SynchrotronRadiationInMat.hh"
#include "G4Integrator.hh"
using namespace std;
////////////////////////////////////////////////////////////////////
//
// Constant for calculation of mean free path
//
const G4double
G4SynchrotronRadiationInMat::fLambdaConst = sqrt(3.0)*electron_mass_c2/
(2.5*fine_structure_const*eplus*c_light) ;
/////////////////////////////////////////////////////////////////////
//
// Constant for calculation of characterictic energy
//
const G4double
G4SynchrotronRadiationInMat::fEnergyConst = 1.5*c_light*c_light*eplus*hbar_Planck/
electron_mass_c2 ;
////////////////////////////////////////////////////////////////////
//
// Array of integral probability of synchrotron photons:
//
// the corresponding energy = 0.0001*i*i*(characteristic energy)
//
const G4double
G4SynchrotronRadiationInMat::fIntegralProbabilityOfSR[200] =
{
1.000000e+00, 9.428859e-01, 9.094095e-01, 8.813971e-01, 8.565154e-01,
8.337008e-01, 8.124961e-01, 7.925217e-01, 7.735517e-01, 7.554561e-01,
7.381233e-01, 7.214521e-01, 7.053634e-01, 6.898006e-01, 6.747219e-01,
6.600922e-01, 6.458793e-01, 6.320533e-01, 6.185872e-01, 6.054579e-01,
5.926459e-01, 5.801347e-01, 5.679103e-01, 5.559604e-01, 5.442736e-01,
5.328395e-01, 5.216482e-01, 5.106904e-01, 4.999575e-01, 4.894415e-01,
4.791351e-01, 4.690316e-01, 4.591249e-01, 4.494094e-01, 4.398800e-01,
4.305320e-01, 4.213608e-01, 4.123623e-01, 4.035325e-01, 3.948676e-01,
3.863639e-01, 3.780179e-01, 3.698262e-01, 3.617858e-01, 3.538933e-01,
3.461460e-01, 3.385411e-01, 3.310757e-01, 3.237474e-01, 3.165536e-01,
3.094921e-01, 3.025605e-01, 2.957566e-01, 2.890784e-01, 2.825237e-01,
2.760907e-01, 2.697773e-01, 2.635817e-01, 2.575020e-01, 2.515365e-01,
2.456834e-01, 2.399409e-01, 2.343074e-01, 2.287812e-01, 2.233607e-01,
2.180442e-01, 2.128303e-01, 2.077174e-01, 2.027040e-01, 1.977885e-01,
1.929696e-01, 1.882457e-01, 1.836155e-01, 1.790775e-01, 1.746305e-01,
1.702730e-01, 1.660036e-01, 1.618212e-01, 1.577243e-01, 1.537117e-01,
1.497822e-01, 1.459344e-01, 1.421671e-01, 1.384791e-01, 1.348691e-01,
1.313360e-01, 1.278785e-01, 1.244956e-01, 1.211859e-01, 1.179483e-01,
1.147818e-01, 1.116850e-01, 1.086570e-01, 1.056966e-01, 1.028026e-01,
9.997405e-02, 9.720975e-02, 9.450865e-02, 9.186969e-02, 8.929179e-02,
8.677391e-02, 8.431501e-02, 8.191406e-02, 7.957003e-02, 7.728192e-02,
7.504872e-02, 7.286944e-02, 7.074311e-02, 6.866874e-02, 6.664538e-02,
6.467208e-02, 6.274790e-02, 6.087191e-02, 5.904317e-02, 5.726079e-02,
5.552387e-02, 5.383150e-02, 5.218282e-02, 5.057695e-02, 4.901302e-02,
4.749020e-02, 4.600763e-02, 4.456450e-02, 4.315997e-02, 4.179325e-02,
4.046353e-02, 3.917002e-02, 3.791195e-02, 3.668855e-02, 3.549906e-02,
3.434274e-02, 3.321884e-02, 3.212665e-02, 3.106544e-02, 3.003452e-02,
2.903319e-02, 2.806076e-02, 2.711656e-02, 2.619993e-02, 2.531021e-02,
2.444677e-02, 2.360897e-02, 2.279620e-02, 2.200783e-02, 2.124327e-02,
2.050194e-02, 1.978324e-02, 1.908662e-02, 1.841151e-02, 1.775735e-02,
1.712363e-02, 1.650979e-02, 1.591533e-02, 1.533973e-02, 1.478250e-02,
1.424314e-02, 1.372117e-02, 1.321613e-02, 1.272755e-02, 1.225498e-02,
1.179798e-02, 1.135611e-02, 1.092896e-02, 1.051609e-02, 1.011712e-02,
9.731635e-03, 9.359254e-03, 8.999595e-03, 8.652287e-03, 8.316967e-03,
7.993280e-03, 7.680879e-03, 7.379426e-03, 7.088591e-03, 6.808051e-03,
6.537491e-03, 6.276605e-03, 6.025092e-03, 5.782661e-03, 5.549027e-03,
5.323912e-03, 5.107045e-03, 4.898164e-03, 4.697011e-03, 4.503336e-03,
4.316896e-03, 4.137454e-03, 3.964780e-03, 3.798649e-03, 3.638843e-03,
3.485150e-03, 3.337364e-03, 3.195284e-03, 3.058715e-03, 2.927469e-03,
2.801361e-03, 2.680213e-03, 2.563852e-03, 2.452110e-03, 2.344824e-03
};
///////////////////////////////////////////////////////////////////////
//
// Constructor
//
G4SynchrotronRadiationInMat::G4SynchrotronRadiationInMat(const G4String& processName,
G4ProcessType type):G4VDiscreteProcess (processName, type),
LowestKineticEnergy (10.*keV),
HighestKineticEnergy (100.*TeV),
TotBin(200),
theGamma (G4Gamma::Gamma() ),
theElectron ( G4Electron::Electron() ),
thePositron ( G4Positron::Positron() ), fAlpha(0.0), fRootNumber(80),
fVerboseLevel( verboseLevel )
{
G4TransportationManager* transportMgr = G4TransportationManager::GetTransportationManager();
fFieldPropagator = transportMgr->GetPropagatorInField();
}
/////////////////////////////////////////////////////////////////////////
//
// Destructor
//
G4SynchrotronRadiationInMat::~G4SynchrotronRadiationInMat()
{
;
}
/////////////////////////////// METHODS /////////////////////////////////
//
//
// Production of synchrotron X-ray photon
// GEANT4 internal units.
//
G4double
G4SynchrotronRadiationInMat::GetMeanFreePath( const G4Track& trackData,
G4double,
G4ForceCondition* condition)
{
// gives the MeanFreePath in GEANT4 internal units
G4double MeanFreePath;
const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();
// G4Material* aMaterial = trackData.GetMaterial();
//G4bool isOutRange ;
*condition = NotForced ;
G4double gamma = aDynamicParticle->GetTotalEnergy()/
aDynamicParticle->GetMass();
G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
G4double KineticEnergy = aDynamicParticle->GetKineticEnergy();
if ( KineticEnergy < LowestKineticEnergy || gamma < 1.0e3 ) MeanFreePath = DBL_MAX;
else
{
G4ThreeVector FieldValue;
const G4Field* pField = 0;
G4FieldManager* fieldMgr=0;
G4bool fieldExertsForce = false;
if( (particleCharge != 0.0) )
{
fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() );
if ( fieldMgr != 0 )
{
// If the field manager has no field, there is no field !
fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 );
}
}
if ( fieldExertsForce )
{
pField = fieldMgr->GetDetectorField() ;
G4ThreeVector globPosition = trackData.GetPosition();
G4double globPosVec[3], FieldValueVec[3];
globPosVec[0] = globPosition.x();
globPosVec[1] = globPosition.y();
globPosVec[2] = globPosition.z();
pField->GetFieldValue( globPosVec, FieldValueVec );
FieldValue = G4ThreeVector( FieldValueVec[0],
FieldValueVec[1],
FieldValueVec[2] );
G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ;
G4double perpB = unitMcrossB.mag() ;
G4double beta = aDynamicParticle->GetTotalMomentum()/
(aDynamicParticle->GetTotalEnergy() );
if( perpB > 0.0 ) MeanFreePath = fLambdaConst*beta/perpB;
else MeanFreePath = DBL_MAX;
}
else MeanFreePath = DBL_MAX;
}
if(fVerboseLevel > 0)
{
G4cout<<"G4SynchrotronRadiationInMat::MeanFreePath = "<<MeanFreePath/m<<" m"<<G4endl;
}
return MeanFreePath;
}
////////////////////////////////////////////////////////////////////////////////
//
//
G4VParticleChange*
G4SynchrotronRadiationInMat::PostStepDoIt(const G4Track& trackData,
const G4Step& stepData )
{
aParticleChange.Initialize(trackData);
const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle();
G4double gamma = aDynamicParticle->GetTotalEnergy()/
(aDynamicParticle->GetMass() );
if(gamma <= 1.0e3 )
{
return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
}
G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
G4ThreeVector FieldValue;
const G4Field* pField = 0 ;
G4FieldManager* fieldMgr=0;
G4bool fieldExertsForce = false;
if( (particleCharge != 0.0) )
{
fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() );
if ( fieldMgr != 0 )
{
// If the field manager has no field, there is no field !
fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 );
}
}
if ( fieldExertsForce )
{
pField = fieldMgr->GetDetectorField() ;
G4ThreeVector globPosition = trackData.GetPosition() ;
G4double globPosVec[3], FieldValueVec[3] ;
globPosVec[0] = globPosition.x() ;
globPosVec[1] = globPosition.y() ;
globPosVec[2] = globPosition.z() ;
pField->GetFieldValue( globPosVec, FieldValueVec ) ;
FieldValue = G4ThreeVector( FieldValueVec[0],
FieldValueVec[1],
FieldValueVec[2] );
G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum);
G4double perpB = unitMcrossB.mag() ;
if(perpB > 0.0)
{
// M-C of synchrotron photon energy
G4double energyOfSR = GetRandomEnergySR(gamma,perpB);
if(fVerboseLevel > 0)
{
G4cout<<"SR photon energy = "<<energyOfSR/keV<<" keV"<<G4endl;
}
// check against insufficient energy
if( energyOfSR <= 0.0 )
{
return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
}
G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
G4ParticleMomentum
particleDirection = aDynamicParticle->GetMomentumDirection();
// M-C of its direction
G4double Teta = G4UniformRand()/gamma ; // Very roughly
G4double Phi = twopi * G4UniformRand() ;
G4double dirx = sin(Teta)*cos(Phi) ,
diry = sin(Teta)*sin(Phi) ,
dirz = cos(Teta) ;
G4ThreeVector gammaDirection ( dirx, diry, dirz);
gammaDirection.rotateUz(particleDirection);
// polarization of new gamma
// G4double sx = cos(Teta)*cos(Phi);
// G4double sy = cos(Teta)*sin(Phi);
// G4double sz = -sin(Teta);
G4ThreeVector gammaPolarization = FieldValue.cross(gammaDirection);
gammaPolarization = gammaPolarization.unit();
// (sx, sy, sz);
// gammaPolarization.rotateUz(particleDirection);
// create G4DynamicParticle object for the SR photon
G4DynamicParticle* aGamma= new G4DynamicParticle ( G4Gamma::Gamma(),
gammaDirection,
energyOfSR );
aGamma->SetPolarization( gammaPolarization.x(),
gammaPolarization.y(),
gammaPolarization.z() );
aParticleChange.SetNumberOfSecondaries(1);
aParticleChange.AddSecondary(aGamma);
// Update the incident particle
G4double newKinEnergy = kineticEnergy - energyOfSR ;
if (newKinEnergy > 0.)
{
aParticleChange.ProposeMomentumDirection( particleDirection );
aParticleChange.ProposeEnergy( newKinEnergy );
aParticleChange.ProposeLocalEnergyDeposit (0.);
}
else
{
aParticleChange.ProposeEnergy( 0. );
aParticleChange.ProposeLocalEnergyDeposit (0.);
G4double charge = aDynamicParticle->GetDefinition()->GetPDGCharge();
if (charge<0.)
{
aParticleChange.ProposeTrackStatus(fStopAndKill) ;
}
else
{
aParticleChange.ProposeTrackStatus(fStopButAlive) ;
}
}
}
else
{
return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
}
}
return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
}
G4double
G4SynchrotronRadiationInMat::GetPhotonEnergy( const G4Track& trackData,
const G4Step& )
{
G4int i ;
G4double energyOfSR = -1.0 ;
//G4Material* aMaterial=trackData.GetMaterial() ;
const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle();
G4double gamma = aDynamicParticle->GetTotalEnergy()/
(aDynamicParticle->GetMass() ) ;
G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
G4ThreeVector FieldValue;
const G4Field* pField = 0 ;
G4FieldManager* fieldMgr=0;
G4bool fieldExertsForce = false;
if( (particleCharge != 0.0) )
{
fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() );
if ( fieldMgr != 0 )
{
// If the field manager has no field, there is no field !
fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 );
}
}
if ( fieldExertsForce )
{
pField = fieldMgr->GetDetectorField();
G4ThreeVector globPosition = trackData.GetPosition();
G4double globPosVec[3], FieldValueVec[3];
globPosVec[0] = globPosition.x();
globPosVec[1] = globPosition.y();
globPosVec[2] = globPosition.z();
pField->GetFieldValue( globPosVec, FieldValueVec );
FieldValue = G4ThreeVector( FieldValueVec[0],
FieldValueVec[1],
FieldValueVec[2] );
G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ;
G4double perpB = unitMcrossB.mag();
if( perpB > 0.0 )
{
// M-C of synchrotron photon energy
G4double random = G4UniformRand() ;
for(i=0;i<200;i++)
{
if(random >= fIntegralProbabilityOfSR[i]) break ;
}
energyOfSR = 0.0001*i*i*fEnergyConst*gamma*gamma*perpB ;
// check against insufficient energy
if(energyOfSR <= 0.0)
{
return -1.0 ;
}
//G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
//G4ParticleMomentum
//particleDirection = aDynamicParticle->GetMomentumDirection();
// Gamma production cut in this material
//G4double
//gammaEnergyCut = (G4Gamma::GetCutsInEnergy())[aMaterial->GetIndex()];
// SR photon has energy more than the current material cut
// M-C of its direction
//G4double Teta = G4UniformRand()/gamma ; // Very roughly
//G4double Phi = twopi * G4UniformRand() ;
}
else
{
return -1.0 ;
}
}
return energyOfSR ;
}
/////////////////////////////////////////////////////////////////////////////////
//
//
G4double G4SynchrotronRadiationInMat::GetRandomEnergySR(G4double gamma, G4double perpB)
{
G4int i, iMax;
G4double energySR, random, position;
iMax = 200;
random = G4UniformRand();
for( i = 0; i < iMax; i++ )
{
if( random >= fIntegralProbabilityOfSR[i] ) break;
}
if(i <= 0 ) position = G4UniformRand(); // 0.
else if( i>= iMax) position = G4double(iMax);
else position = i + G4UniformRand(); // -1
//
// it was in initial implementation:
// energyOfSR = 0.0001*i*i*fEnergyConst*gamma*gamma*perpB ;
energySR = 0.0001*position*position*fEnergyConst*gamma*gamma*perpB;
if( energySR < 0. ) energySR = 0.;
return energySR;
}
/////////////////////////////////////////////////////////////////////////
//
// return
G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt( G4double t)
{
G4double result, hypCos2, hypCos=std::cosh(t);
hypCos2 = hypCos*hypCos;
result = std::cosh(5.*t/3.)*std::exp(t-fKsi*hypCos); // fKsi > 0. !
result /= hypCos2;
return result;
}
///////////////////////////////////////////////////////////////////////////
//
// return the probability to emit SR photon with relative energy
// energy/energy_c >= ksi
// for ksi <= 0. P = 1., however the method works for ksi > 0 only!
G4double G4SynchrotronRadiationInMat::GetIntProbSR( G4double ksi)
{
if (ksi <= 0.) return 1.0;
fKsi = ksi; // should be > 0. !
G4int n;
G4double result, a;
a = fAlpha; // always = 0.
n = fRootNumber; // around default = 80
G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral;
result = integral.Laguerre(this,
&G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt, a, n);
result *= 3./5./pi;
return result;
}
/////////////////////////////////////////////////////////////////////////
//
// return an auxiliary function for K_5/3 integral representation
G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy( G4double t)
{
G4double result, hypCos=std::cosh(t);
result = std::cosh(5.*t/3.)*std::exp(t - fKsi*hypCos); // fKsi > 0. !
result /= hypCos;
return result;
}
///////////////////////////////////////////////////////////////////////////
//
// return the probability to emit SR photon energy with relative energy
// energy/energy_c >= ksi
// for ksi <= 0. P = 1., however the method works for ksi > 0 only!
G4double G4SynchrotronRadiationInMat::GetEnergyProbSR( G4double ksi)
{
if (ksi <= 0.) return 1.0;
fKsi = ksi; // should be > 0. !
G4int n;
G4double result, a;
a = fAlpha; // always = 0.
n = fRootNumber; // around default = 80
G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral;
result = integral.Laguerre(this,
&G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy, a, n);
result *= 9.*std::sqrt(3.)*ksi/8./pi;
return result;
}
/////////////////////////////////////////////////////////////////////////////
//
//
G4double G4SynchrotronRadiationInMat::GetIntegrandForAngleK( G4double t)
{
G4double result, hypCos=std::cosh(t);
result = std::cosh(fOrderAngleK*t)*std::exp(t - fEta*hypCos); // fEta > 0. !
result /= hypCos;
return result;
}
//////////////////////////////////////////////////////////////////////////
//
// Return K 1/3 or 2/3 for angular distribution
G4double G4SynchrotronRadiationInMat::GetAngleK( G4double eta)
{
fEta = eta; // should be > 0. !
G4int n;
G4double result, a;
a = fAlpha; // always = 0.
n = fRootNumber; // around default = 80
G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral;
result = integral.Laguerre(this,
&G4SynchrotronRadiationInMat::GetIntegrandForAngleK, a, n);
return result;
}
/////////////////////////////////////////////////////////////////////////
//
// Relative angle diff distribution for given fKsi, which is set externally
G4double G4SynchrotronRadiationInMat::GetAngleNumberAtGammaKsi( G4double gpsi)
{
G4double result, funK, funK2, gpsi2 = gpsi*gpsi;
fPsiGamma = gpsi;
fEta = 0.5*fKsi*(1 + gpsi2)*std::sqrt(1 + gpsi2);
fOrderAngleK = 1./3.;
funK = GetAngleK(fEta);
funK2 = funK*funK;
result = gpsi2*funK2/(1 + gpsi2);
fOrderAngleK = 2./3.;
funK = GetAngleK(fEta);
funK2 = funK*funK;
result += funK2;
result *= (1 + gpsi2)*fKsi;
return result;
}
///////////////////// end of G4SynchrotronRadiationInMat.cc