G4SynchrotronRadiation Class Reference

#include <G4SynchrotronRadiation.hh>

Inheritance diagram for G4SynchrotronRadiation:

Collaboration 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)
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 &)

Private Member Functions
G4SynchrotronRadiation &	operator= (const G4SynchrotronRadiation &right)
	G4SynchrotronRadiation (const G4SynchrotronRadiation &)

Private Attributes
G4VEmAngularDistribution *	genAngle
G4ParticleDefinition *	theGamma
G4PropagatorInField *	fFieldPropagator
G4bool	FirstTime
G4bool	FirstTime1

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() [1/2]

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

Definition at line 57 of file G4SynchrotronRadiation.cc.

                     :G4VDiscreteProcess (processName, type),
  theGamma (G4Gamma::Gamma() ) 
{
  G4TransportationManager* transportMgr = 
    G4TransportationManager::GetTransportationManager();

  fFieldPropagator = transportMgr->GetPropagatorInField();

  SetProcessSubType(fSynchrotronRadiation);
  verboseLevel = 1;
  FirstTime    = true;
  FirstTime1   = true;
  genAngle     = 0;
  SetAngularGenerator(new G4DipBustGenerator());
}

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~G4SynchrotronRadiation()

G4SynchrotronRadiation::~G4SynchrotronRadiation ( )

virtual

Definition at line 79 of file G4SynchrotronRadiation.cc.

{
    delete genAngle;
}

G4SynchrotronRadiation() [2/2]

G4SynchrotronRadiation::G4SynchrotronRadiation ( const G4SynchrotronRadiation &  )

private

Member Function Documentation

BuildPhysicsTable()

void G4SynchrotronRadiation::BuildPhysicsTable ( const G4ParticleDefinition &  part )

virtual

Reimplemented from G4VProcess.

Definition at line 405 of file G4SynchrotronRadiation.cc.

{
  if(0 < verboseLevel && &part==G4Electron::Electron() ) PrintInfoDefinition();
  // same for all particles, print only for one (electron)
}

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Chebyshev()

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

inline

Definition at line 112 of file G4SynchrotronRadiation.hh.

{
  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];
}

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GetMeanFreePath()

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

virtual

Implements G4VDiscreteProcess.

Definition at line 109 of file G4SynchrotronRadiation.cc.

{
  // gives the MeanFreePath in GEANT4 internal units
  G4double MeanFreePath = DBL_MAX;

  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();

      static const G4double fLambdaConst = std::sqrt(3.0)*eplus/
    (2.5*fine_structure_const*c_light); 
      
      if( perpB > 0.0 )
      {
        MeanFreePath = 
      fLambdaConst*aDynamicParticle->GetDefinition()->GetPDGMass()
      /(perpB*particleCharge*particleCharge);
      }
      if(verboseLevel > 0 && FirstTime)
      {
        G4cout << "G4SynchrotronRadiation::GetMeanFreePath "
           << " for particle " 
           << aDynamicParticle->GetDefinition()->GetParticleName() 
           << ":" << '\n'  //hbunew
           << "  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;
      }
    }
  }
  return MeanFreePath;
}

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GetPhotonEnergy()

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

GetRandomEnergySR()

G4double G4SynchrotronRadiation::GetRandomEnergySR	(	G4double	gamma,
		G4double	perpB,
		G4double	mass_c2
	)

Definition at line 374 of file G4SynchrotronRadiation.cc.

{

  static const G4double fEnergyConst = 1.5*c_light*c_light*eplus*hbar_Planck; 
  G4double Ecr=fEnergyConst*gamma*gamma*perpB/mass_c2;

  if(verboseLevel > 0 && FirstTime1)
  { 
    // mean and rms of photon energy 
    G4double Emean=8./(15.*std::sqrt(3.))*Ecr;
    G4double E_rms=std::sqrt(211./675.)*Ecr; 
    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;
}

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InvSynFracInt()

G4double G4SynchrotronRadiation::InvSynFracInt

(

G4double

x

)

Definition at line 315 of file G4SynchrotronRadiation.cc.

{
  // 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);
  }
}

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IsApplicable()

G4bool G4SynchrotronRadiation::IsApplicable ( const G4ParticleDefinition &  particle )

virtual

Reimplemented from G4VProcess.

Definition at line 97 of file G4SynchrotronRadiation.cc.

{
  return (particle.GetPDGCharge() != 0.0 && !particle.IsShortLived()); 
}

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operator=()

G4SynchrotronRadiation& G4SynchrotronRadiation::operator= ( const G4SynchrotronRadiation &  right )

private

PostStepDoIt()

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

virtual

Reimplemented from G4VDiscreteProcess.

Definition at line 212 of file G4SynchrotronRadiation.cc.

{
  aParticleChange.Initialize(trackData);

  const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();

  G4double gamma = aDynamicParticle->GetTotalEnergy()/
    (aDynamicParticle->GetDefinition()->GetPDGMass());

  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,
              aDynamicParticle->GetDefinition()->GetPDGMass());

      // 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);
}

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PrintInfoDefinition()

void G4SynchrotronRadiation::PrintInfoDefinition ( )

virtual

Definition at line 415 of file G4SynchrotronRadiation.cc.

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

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SetAngularGenerator()

void G4SynchrotronRadiation::SetAngularGenerator

(

G4VEmAngularDistribution *

p

)

Definition at line 88 of file G4SynchrotronRadiation.cc.

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

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Member Data Documentation

fFieldPropagator

G4PropagatorInField* G4SynchrotronRadiation::fFieldPropagator

private

Definition at line 104 of file G4SynchrotronRadiation.hh.

FirstTime

G4bool G4SynchrotronRadiation::FirstTime

private

Definition at line 105 of file G4SynchrotronRadiation.hh.

FirstTime1

G4bool G4SynchrotronRadiation::FirstTime1

private

Definition at line 106 of file G4SynchrotronRadiation.hh.

genAngle

G4VEmAngularDistribution* G4SynchrotronRadiation::genAngle

private

Definition at line 100 of file G4SynchrotronRadiation.hh.

theGamma

G4ParticleDefinition* G4SynchrotronRadiation::theGamma

private

Definition at line 102 of file G4SynchrotronRadiation.hh.

---

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

• G4SynchrotronRadiation.hh
• G4SynchrotronRadiation.cc