#include <G4SynchrotronRadiation.hh>

Inheritance diagram for G4SynchrotronRadiation:

Public Member Functions
	G4SynchrotronRadiation (const G4String &pName="SynRad", G4ProcessType type=fElectromagnetic)

virtual	~G4SynchrotronRadiation ()

virtual G4double	GetMeanFreePath (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)

virtual G4VParticleChange *	PostStepDoIt (const G4Track &track, const G4Step &Step)

G4double	GetPhotonEnergy (const G4Track &trackData, const G4Step &stepData)

G4double	GetRandomEnergySR (G4double, G4double)

G4double	InvSynFracInt (G4double x)

G4double	Chebyshev (G4double a, G4double b, const G4double c[], G4int n, G4double x)

virtual G4bool	IsApplicable (const G4ParticleDefinition &)

virtual void	BuildPhysicsTable (const G4ParticleDefinition &)

virtual void	PrintInfoDefinition ()

void	SetAngularGenerator (G4VEmAngularDistribution *p)

Public Member Functions inherited from G4VDiscreteProcess
	G4VDiscreteProcess (const G4String &, G4ProcessType aType=fNotDefined)

	G4VDiscreteProcess (G4VDiscreteProcess &)

virtual	~G4VDiscreteProcess ()

virtual G4double	PostStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)

virtual G4double	AlongStepGetPhysicalInteractionLength (const G4Track &, G4double, G4double, G4double &, G4GPILSelection *)

virtual G4double	AtRestGetPhysicalInteractionLength (const G4Track &, G4ForceCondition *)

virtual G4VParticleChange *	AtRestDoIt (const G4Track &, const G4Step &)

virtual G4VParticleChange *	AlongStepDoIt (const G4Track &, const G4Step &)

Public Member Functions inherited from G4VProcess
	G4VProcess (const G4String &aName="NoName", G4ProcessType aType=fNotDefined)

	G4VProcess (const G4VProcess &right)

virtual	~G4VProcess ()

G4int	operator== (const G4VProcess &right) const

G4int	operator!= (const G4VProcess &right) const

G4double	GetCurrentInteractionLength () const

void	SetPILfactor (G4double value)

G4double	GetPILfactor () const

G4double	AlongStepGPIL (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &proposedSafety, G4GPILSelection *selection)

G4double	AtRestGPIL (const G4Track &track, G4ForceCondition *condition)

G4double	PostStepGPIL (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)

virtual void	PreparePhysicsTable (const G4ParticleDefinition &)

virtual G4bool	StorePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)

virtual G4bool	RetrievePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)

const G4String &	GetPhysicsTableFileName (const G4ParticleDefinition *, const G4String &directory, const G4String &tableName, G4bool ascii=false)

const G4String &	GetProcessName () const

G4ProcessType	GetProcessType () const

void	SetProcessType (G4ProcessType)

G4int	GetProcessSubType () const

void	SetProcessSubType (G4int)

virtual void	StartTracking (G4Track *)

virtual void	EndTracking ()

virtual void	SetProcessManager (const G4ProcessManager *)

virtual const G4ProcessManager *	GetProcessManager ()

virtual void	ResetNumberOfInteractionLengthLeft ()

G4double	GetNumberOfInteractionLengthLeft () const

G4double	GetTotalNumberOfInteractionLengthTraversed () const

G4bool	isAtRestDoItIsEnabled () const

G4bool	isAlongStepDoItIsEnabled () const

G4bool	isPostStepDoItIsEnabled () const

virtual void	DumpInfo () const

void	SetVerboseLevel (G4int value)

G4int	GetVerboseLevel () const

virtual void	SetMasterProcess (G4VProcess *masterP)

const G4VProcess *	GetMasterProcess () const

virtual void	BuildWorkerPhysicsTable (const G4ParticleDefinition &part)

virtual void	PrepareWorkerPhysicsTable (const G4ParticleDefinition &)

Additional Inherited Members
Static Public Member Functions inherited from G4VProcess
static const G4String &	GetProcessTypeName (G4ProcessType)

Protected Member Functions inherited from G4VProcess
void	SubtractNumberOfInteractionLengthLeft (G4double previousStepSize)

void	ClearNumberOfInteractionLengthLeft ()

Protected Attributes inherited from G4VProcess
const G4ProcessManager *	aProcessManager

G4VParticleChange *	pParticleChange

G4ParticleChange	aParticleChange

G4double	theNumberOfInteractionLengthLeft

G4double	currentInteractionLength

G4double	theInitialNumberOfInteractionLength

G4String	theProcessName

G4String	thePhysicsTableFileName

G4ProcessType	theProcessType

G4int	theProcessSubType

G4double	thePILfactor

G4bool	enableAtRestDoIt

G4bool	enableAlongStepDoIt

G4bool	enablePostStepDoIt

G4int	verboseLevel

Detailed Description

Definition at line 64 of file G4SynchrotronRadiation.hh.

Constructor & Destructor Documentation

G4SynchrotronRadiation::G4SynchrotronRadiation	(	const G4String &	pName = `"SynRad"`,
		G4ProcessType	type = `fElectromagnetic`
	)

Definition at line 57 of file G4SynchrotronRadiation.cc.

References python.hepunit::c_light, python.hepunit::electron_mass_c2, python.hepunit::eplus, python.hepunit::fine_structure_const, fSynchrotronRadiation, G4TransportationManager::GetPropagatorInField(), G4TransportationManager::GetTransportationManager(), python.hepunit::hbar_Planck, SetAngularGenerator(), G4VProcess::SetProcessSubType(), and G4VProcess::verboseLevel.

                      :G4VDiscreteProcess (processName, type),
   theGamma (G4Gamma::Gamma() ),
   theElectron ( G4Electron::Electron() ),
   thePositron ( G4Positron::Positron() )
 {
   G4TransportationManager* transportMgr = 
     G4TransportationManager::GetTransportationManager();
 
   fFieldPropagator = transportMgr->GetPropagatorInField();
 
   fLambdaConst = std::sqrt(3.0)*electron_mass_c2/
                            (2.5*fine_structure_const*eplus*c_light);
   fEnergyConst = 1.5*c_light*c_light*eplus*hbar_Planck/electron_mass_c2 ;
 
   SetProcessSubType(fSynchrotronRadiation);
   verboseLevel = 1;
   FirstTime    = true;
   FirstTime1   = true;
   genAngle     = 0;
   SetAngularGenerator(new G4DipBustGenerator());
 }

G4SynchrotronRadiation::~G4SynchrotronRadiation ( )

virtual

Definition at line 85 of file G4SynchrotronRadiation.cc.

 {
     delete genAngle;
 }

Member Function Documentation

void G4SynchrotronRadiation::BuildPhysicsTable ( const G4ParticleDefinition & part )

virtual

Reimplemented from G4VProcess.

Definition at line 401 of file G4SynchrotronRadiation.cc.

References PrintInfoDefinition(), and G4VProcess::verboseLevel.

 {
   if(0 < verboseLevel && &part==theElectron ) PrintInfoDefinition();
 }

G4double G4SynchrotronRadiation::Chebyshev	(	G4double	a,
		G4double	b,
		const G4double	c[],
		G4int	n,
		G4double	x
	)

inline

Definition at line 117 of file G4SynchrotronRadiation.hh.

References test::b.

Referenced by InvSynFracInt().

 {
   G4double y;
   G4double y2=2.0*(y=(2.0*x-a-b)/(b-a)); // Change of variable.
   G4double d=0,dd=0;
   for (G4int j=n-1;j>=1;--j) // Clenshaw's recurrence.
   { G4double sv=d;
     d=y2*d-dd+c[j];
     dd=sv;
   }
   return y*d-dd+0.5*c[0];
 }

G4double G4SynchrotronRadiation::GetMeanFreePath	(	const G4Track &	track,
		G4double	previousStepSize,
		G4ForceCondition *	condition
	)

virtual

Implements G4VDiscreteProcess.

Definition at line 115 of file G4SynchrotronRadiation.cc.

References python.hepunit::c_light, CLHEP::Hep3Vector::cross(), DBL_MAX, G4PropagatorInField::FindAndSetFieldManager(), G4BestUnit, G4cout, G4endl, G4DynamicParticle::GetDefinition(), G4FieldManager::GetDetectorField(), G4Track::GetDynamicParticle(), G4Field::GetFieldValue(), G4Track::GetGlobalTime(), G4DynamicParticle::GetMass(), G4DynamicParticle::GetMomentum(), G4DynamicParticle::GetMomentumDirection(), G4ParticleDefinition::GetPDGCharge(), G4Track::GetPosition(), CLHEP::Hep3Vector::getR(), G4DynamicParticle::GetTotalEnergy(), G4Track::GetVolume(), CLHEP::Hep3Vector::mag(), python.hepunit::MeV, NotForced, python.hepunit::tesla, CLHEP::Hep3Vector::theta(), G4VProcess::verboseLevel, CLHEP::Hep3Vector::x(), CLHEP::Hep3Vector::y(), and CLHEP::Hep3Vector::z().

 {
   // gives the MeanFreePath in GEANT4 internal units
   G4double MeanFreePath;
 
   const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();
 
   *condition = NotForced;
 
   G4double gamma = aDynamicParticle->GetTotalEnergy()/
                    aDynamicParticle->GetMass();
 
   G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
 
   if ( gamma < 1.0e3 || 0.0 == particleCharge)  { MeanFreePath = DBL_MAX; }
   else
   {
 
     G4ThreeVector  FieldValue;
     const G4Field* pField = 0;
     G4bool         fieldExertsForce = false;
 
 
     G4FieldManager* 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[4], FieldValueVec[6];
 
       globPosVec[0] = globPosition.x();
       globPosVec[1] = globPosition.y();
       globPosVec[2] = globPosition.z();
       globPosVec[3] = trackData.GetGlobalTime();
 
       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 ) MeanFreePath = fLambdaConst/perpB;
       else              MeanFreePath = DBL_MAX;
 
       if(verboseLevel > 0 && FirstTime)
       {
         G4cout << "G4SynchrotronRadiation::GetMeanFreePath :" << '\n' 
            << "  MeanFreePath = " << G4BestUnit(MeanFreePath, "Length")
            << G4endl;
         if(verboseLevel > 1)
         {
           G4ThreeVector pvec = aDynamicParticle->GetMomentum();
           G4double Btot = FieldValue.getR();
           G4double ptot = pvec.getR();
           G4double rho  = ptot / (MeV * c_light * Btot ); 
       // full bending radius
           G4double Theta=unitMomentum.theta(FieldValue); 
       // angle between particle and field
           G4cout << "  B = " << Btot/tesla << " Tesla"
          << "  perpB = " << perpB/tesla << " Tesla"
          << "  Theta = " << Theta << " std::sin(Theta)=" 
          << std::sin(Theta) << '\n'
          << "  ptot  = " << G4BestUnit(ptot,"Energy")
          << "  rho   = " << G4BestUnit(rho,"Length")
          << G4endl;
         }
     FirstTime=false;
       }
     }
     else  MeanFreePath = DBL_MAX;
 
   }
 
   return MeanFreePath;
 }

G4double G4SynchrotronRadiation::GetPhotonEnergy	(	const G4Track &	trackData,
		const G4Step &	stepData
	)

G4double G4SynchrotronRadiation::GetRandomEnergySR	(	G4double	gamma,
		G4double	perpB
	)

Definition at line 373 of file G4SynchrotronRadiation.cc.

References G4BestUnit, G4cout, G4endl, G4UniformRand, InvSynFracInt(), and G4VProcess::verboseLevel.

Referenced by PostStepDoIt().

 {
 
   G4double Ecr=fEnergyConst*gamma*gamma*perpB;
 
   //  static G4ThreadLocal G4bool FirstTime=true;
   if(verboseLevel > 0 && FirstTime1)
   { G4double Emean=8./(15.*std::sqrt(3.))*Ecr; // mean photon energy
     G4double E_rms=std::sqrt(211./675.)*Ecr; // rms of photon energy distribution
     G4int prec = G4cout.precision();
     G4cout << "G4SynchrotronRadiation::GetRandomEnergySR :" << '\n' 
        << std::setprecision(4)
        << "  Ecr   = "    << G4BestUnit(Ecr,"Energy") << '\n'
        << "  Emean = "    << G4BestUnit(Emean,"Energy") << '\n'
        << "  E_rms = "    << G4BestUnit(E_rms,"Energy") << G4endl;
     FirstTime1=false;
     G4cout.precision(prec); 
   }
 
   G4double energySR=Ecr*InvSynFracInt(G4UniformRand());
   return energySR;
 }

G4double G4SynchrotronRadiation::InvSynFracInt ( G4double x )

Definition at line 313 of file G4SynchrotronRadiation.cc.

References Chebyshev(), and G4Log().

Referenced by GetRandomEnergySR().

 {
   // from 0 to 0.7
   static const G4double aa1=0  ,aa2=0.7;
   static const G4int ncheb1=27;
   static const G4double cheb1[] =
   { 1.22371665676046468821,0.108956475422163837267,0.0383328524358594396134,0.00759138369340257753721,
    0.00205712048644963340914,0.000497810783280019308661,0.000130743691810302187818,0.0000338168760220395409734,
    8.97049680900520817728e-6,2.38685472794452241466e-6,6.41923109149104165049e-7,1.73549898982749277843e-7,
    4.72145949240790029153e-8,1.29039866111999149636e-8,3.5422080787089834182e-9,9.7594757336403784905e-10,
    2.6979510184976065731e-10,7.480422622550977077e-11,2.079598176402699913e-11,5.79533622220841193e-12,
    1.61856011449276096e-12,4.529450993473807e-13,1.2698603951096606e-13,3.566117394511206e-14,1.00301587494091e-14,
    2.82515346447219e-15,7.9680747949792e-16};
   //   from 0.7 to 0.9132260271183847
   static const G4double aa3=0.9132260271183847;
   static const G4int ncheb2=27;
   static const G4double cheb2[] =
   { 1.1139496701107756,0.3523967429328067,0.0713849171926623,0.01475818043595387,0.003381255637322462,
     0.0008228057599452224,0.00020785506681254216,0.00005390169253706556,0.000014250571923902464,3.823880733161044e-6,
     1.0381966089136036e-6,2.8457557457837253e-7,7.86223332179956e-8,2.1866609342508474e-8,6.116186259857143e-9,
     1.7191233618437565e-9,4.852755117740807e-10,1.3749966961763457e-10,3.908961987062447e-11,1.1146253766895824e-11,
     3.1868887323415814e-12,9.134319791300977e-13,2.6211077371181566e-13,7.588643377757906e-14,2.1528376972619e-14,
     6.030906040404772e-15,1.9549163926819867e-15};
    // Chebyshev with exp/log  scale
    // a = -Log[1 - SynFracInt[1]]; b = -Log[1 - SynFracInt[7]];
   static const G4double aa4=2.4444485538746025480,aa5=9.3830728608909477079;
   static const G4int ncheb3=28;
   static const G4double cheb3[] =
   { 1.2292683840435586977,0.160353449247864455879,-0.0353559911947559448721,0.00776901561223573936985,
    -0.00165886451971685133259,0.000335719118906954279467,-0.0000617184951079161143187,9.23534039743246708256e-6,
    -6.06747198795168022842e-7,-3.07934045961999778094e-7,1.98818772614682367781e-7,-8.13909971567720135413e-8,
    2.84298174969641838618e-8,-9.12829766621316063548e-9,2.77713868004820551077e-9,-8.13032767247834023165e-10,
    2.31128525568385247392e-10,-6.41796873254200220876e-11,1.74815310473323361543e-11,-4.68653536933392363045e-12,
    1.24016595805520752748e-12,-3.24839432979935522159e-13,8.44601465226513952994e-14,-2.18647276044246803998e-14,
    5.65407548745690689978e-15,-1.46553625917463067508e-15,3.82059606377570462276e-16,-1.00457896653436912508e-16};
   static const G4double aa6=33.122936966163038145;
   static const G4int ncheb4=27;
   static const G4double cheb4[] =
   {1.69342658227676741765,0.0742766400841232319225,-0.019337880608635717358,0.00516065527473364110491,
    -0.00139342012990307729473,0.000378549864052022522193,-0.000103167085583785340215,0.0000281543441271412178337,
    -7.68409742018258198651e-6,2.09543221890204537392e-6,-5.70493140367526282946e-7,1.54961164548564906446e-7,
    -4.19665599629607704794e-8,1.13239680054166507038e-8,-3.04223563379021441863e-9,8.13073745977562957997e-10,
    -2.15969415476814981374e-10,5.69472105972525594811e-11,-1.48844799572430829499e-11,3.84901514438304484973e-12,
    -9.82222575944247161834e-13,2.46468329208292208183e-13,-6.04953826265982691612e-14,1.44055805710671611984e-14,
    -3.28200813577388740722e-15,6.96566359173765367675e-16,-1.294122794852896275e-16};
 
   if(x<aa2)      return x*x*x*Chebyshev(aa1,aa2,cheb1,ncheb1,x);
   else if(x<aa3) return       Chebyshev(aa2,aa3,cheb2,ncheb2,x);
   else if(x<1-0.0000841363)
   { G4double y=-G4Log(1-x);
     return y*Chebyshev(aa4,aa5,cheb3,ncheb3,y);
   }
   else
   { G4double y=-G4Log(1-x);
     return y*Chebyshev(aa5,aa6,cheb4,ncheb4,y);
   }
 }

G4bool G4SynchrotronRadiation::IsApplicable ( const G4ParticleDefinition & particle )

virtual

Reimplemented from G4VProcess.

Definition at line 103 of file G4SynchrotronRadiation.cc.

 {
   return ( ( &particle == theElectron ) || ( &particle == thePositron ));
 }

G4VParticleChange * G4SynchrotronRadiation::PostStepDoIt	(	const G4Track &	track,
		const G4Step &	Step
	)

virtual

Reimplemented from G4VDiscreteProcess.

Definition at line 212 of file G4SynchrotronRadiation.cc.

References G4ParticleChange::AddSecondary(), G4VProcess::aParticleChange, CLHEP::Hep3Vector::cross(), G4PropagatorInField::FindAndSetFieldManager(), G4DynamicParticle::GetDefinition(), G4FieldManager::GetDetectorField(), G4Track::GetDynamicParticle(), G4Field::GetFieldValue(), G4Track::GetGlobalTime(), G4DynamicParticle::GetKineticEnergy(), G4DynamicParticle::GetMass(), G4DynamicParticle::GetMomentumDirection(), G4ParticleDefinition::GetPDGCharge(), G4Track::GetPosition(), GetRandomEnergySR(), G4DynamicParticle::GetTotalEnergy(), G4Track::GetVolume(), G4ParticleChange::Initialize(), CLHEP::Hep3Vector::mag(), G4VDiscreteProcess::PostStepDoIt(), G4ParticleChange::ProposeEnergy(), G4VEmAngularDistribution::SampleDirection(), G4VParticleChange::SetNumberOfSecondaries(), G4DynamicParticle::SetPolarization(), CLHEP::Hep3Vector::unit(), CLHEP::Hep3Vector::x(), CLHEP::Hep3Vector::y(), and CLHEP::Hep3Vector::z().

 {
   aParticleChange.Initialize(trackData);
 
   const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();
 
   G4double gamma = aDynamicParticle->GetTotalEnergy()/
                    (aDynamicParticle->GetMass()              );
 
   G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
   if(gamma <= 1.0e3  || 0.0 == particleCharge) 
   {
     return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
   }
 
   G4ThreeVector  FieldValue;
   const G4Field*   pField = 0;
 
   G4bool          fieldExertsForce = false;
   G4FieldManager* 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[4], FieldValueVec[6];
     globPosVec[0] = globPosition.x();
     globPosVec[1] = globPosition.y();
     globPosVec[2] = globPosition.z();
     globPosVec[3] = trackData.GetGlobalTime();
 
     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);
 
       // check against insufficient energy
 
       if( energyOfSR <= 0.0 )
       {
         return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
       }
       G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
       G4ThreeVector gammaDirection = 
     genAngle->SampleDirection(aDynamicParticle,
                   energyOfSR, 1, 0);
 
       G4ThreeVector gammaPolarization = FieldValue.cross(gammaDirection);
       gammaPolarization = gammaPolarization.unit();
 
       // create G4DynamicParticle object for the SR photon
 
       G4DynamicParticle* aGamma= new G4DynamicParticle ( theGamma,
                              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.ProposeEnergy( newKinEnergy );
       }
       else
       {
     aParticleChange.ProposeEnergy( 0. );
       }
     }
   }
   return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
 }

void G4SynchrotronRadiation::PrintInfoDefinition ( )

virtual

Definition at line 410 of file G4SynchrotronRadiation.cc.

References G4cout, G4endl, and G4VProcess::GetProcessName().

Referenced by BuildPhysicsTable().

 {
   G4String comments ="Incoherent Synchrotron Radiation\n";
   G4cout << G4endl << GetProcessName() << ":  " << comments
          << "      good description for long magnets at all energies" 
      << G4endl;
 }

void G4SynchrotronRadiation::SetAngularGenerator ( G4VEmAngularDistribution * p )

Definition at line 94 of file G4SynchrotronRadiation.cc.

Referenced by G4SynchrotronRadiation().

 {
   if(p != genAngle) {
     delete genAngle;
     genAngle = p;
   }
 }

The documentation for this class was generated from the following files:

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation