#include <G4HelixExplicitEuler.hh>

Inheritance diagram for G4HelixExplicitEuler:

Public Member Functions
	G4HelixExplicitEuler (G4Mag_EqRhs *EqRhs)

	~G4HelixExplicitEuler ()

void	Stepper (const G4double y[], const G4double *, G4double h, G4double yout[], G4double yerr[])

void	DumbStepper (const G4double y[], G4ThreeVector Bfld, G4double h, G4double yout[])

G4double	DistChord () const

G4int	IntegratorOrder () const

Public Member Functions inherited from G4MagHelicalStepper
	G4MagHelicalStepper (G4Mag_EqRhs *EqRhs)

virtual	~G4MagHelicalStepper ()

	G4MagHelicalStepper (const G4MagHelicalStepper &)=delete

G4MagHelicalStepper &	operator= (const G4MagHelicalStepper &)=delete

virtual void	Stepper (const G4double y[], const G4double dydx[], G4double h, G4double yout[], G4double yerr[])

virtual void	DumbStepper (const G4double y[], G4ThreeVector Bfld, G4double h, G4double yout[])=0

G4double	DistChord () const

Public Member Functions inherited from G4MagIntegratorStepper
	G4MagIntegratorStepper (G4EquationOfMotion *Equation, G4int numIntegrationVariables, G4int numStateVariables=12, G4bool isFSAL=false)

virtual	~G4MagIntegratorStepper ()=default

	G4MagIntegratorStepper (const G4MagIntegratorStepper &)=delete

G4MagIntegratorStepper &	operator= (const G4MagIntegratorStepper &)=delete

virtual void	Stepper (const G4double y[], const G4double dydx[], G4double h, G4double yout[], G4double yerr[])=0

virtual G4double	DistChord () const =0

void	NormaliseTangentVector (G4double vec[6])

void	NormalisePolarizationVector (G4double vec[12])

void	RightHandSide (const G4double y[], G4double dydx[]) const

void	RightHandSide (const G4double y[], G4double dydx[], G4double field[]) const

G4int	GetNumberOfVariables () const

G4int	GetNumberOfStateVariables () const

virtual G4int	IntegratorOrder () const =0

G4int	IntegrationOrder ()

G4EquationOfMotion *	GetEquationOfMotion ()

const G4EquationOfMotion *	GetEquationOfMotion () const

void	SetEquationOfMotion (G4EquationOfMotion *newEquation)

unsigned long	GetfNoRHSCalls ()

void	ResetfNORHSCalls ()

G4bool	IsFSAL () const

Additional Inherited Members
Protected Member Functions inherited from G4MagHelicalStepper
void	LinearStep (const G4double yIn[], G4double h, G4double yHelix[]) const

void	AdvanceHelix (const G4double yIn[], G4ThreeVector Bfld, G4double h, G4double yHelix[], G4double yHelix2[]=0)

void	MagFieldEvaluate (const G4double y[], G4ThreeVector &Bfield)

G4double	GetInverseCurve (const G4double Momentum, const G4double Bmag)

void	SetAngCurve (const G4double Ang)

G4double	GetAngCurve () const

void	SetCurve (const G4double Curve)

G4double	GetCurve () const

void	SetRadHelix (const G4double Rad)

G4double	GetRadHelix () const

Protected Member Functions inherited from G4MagIntegratorStepper
void	SetIntegrationOrder (G4int order)

void	SetFSAL (G4bool flag=true)

Detailed Description

Definition at line 42 of file G4HelixExplicitEuler.hh.

Constructor & Destructor Documentation

◆ G4HelixExplicitEuler()

G4HelixExplicitEuler::G4HelixExplicitEuler ( G4Mag_EqRhs * EqRhs )

Definition at line 40 of file G4HelixExplicitEuler.cc.

  : G4MagHelicalStepper(EqRhs)
{
}

◆ ~G4HelixExplicitEuler()

G4HelixExplicitEuler::~G4HelixExplicitEuler ( )

Definition at line 45 of file G4HelixExplicitEuler.cc.

46{

47}

Member Function Documentation

◆ DistChord()

G4double G4HelixExplicitEuler::DistChord ( ) const

virtual

Implements G4MagIntegratorStepper.

Definition at line 89 of file G4HelixExplicitEuler.cc.

{
  // Implementation : must check whether h/R > 2 pi  !!
  //   If( h/R <  pi) use G4LineSection::DistLine
  //   Else           DistChord=R_helix
  //
  G4double distChord;
  G4double Ang_curve=GetAngCurve();
 
 
  if(Ang_curve<=pi)
  {
    distChord=GetRadHelix()*(1-std::cos(0.5*Ang_curve));
  }
  else if(Ang_curve<twopi)
  {
    distChord=GetRadHelix()*(1+std::cos(0.5*(twopi-Ang_curve)));
  }
  else
  {
    distChord=2.*GetRadHelix();  
  }
 
  return distChord;
}

◆ DumbStepper()

void G4HelixExplicitEuler::DumbStepper	(	const G4double	y[],
		G4ThreeVector	Bfld,
		G4double	h,
		G4double	yout[]
	)

virtual

Implements G4MagHelicalStepper.

Definition at line 115 of file G4HelixExplicitEuler.cc.

{
   AdvanceHelix(yIn, Bfld, h, yOut);
}  

◆ IntegratorOrder()

G4int G4HelixExplicitEuler::IntegratorOrder ( ) const

inlinevirtual

Implements G4MagIntegratorStepper.

Definition at line 64 of file G4HelixExplicitEuler.hh.

64{ return 1; }

◆ Stepper()

void G4HelixExplicitEuler::Stepper	(	const G4double	y[],
		const G4double *	,
		G4double	h,
		G4double	yout[],
		G4double	yerr[]
	)

Definition at line 49 of file G4HelixExplicitEuler.cc.

{
  // Estimation of the Stepping Angle
  //
  G4ThreeVector Bfld;
  MagFieldEvaluate(yInput, Bfld); 
  
  const G4int nvar = 6 ;
  G4double yTemp[8], yIn[8] ;
  G4ThreeVector  Bfld_midpoint;
 
  // Saving yInput because yInput and yOut can be aliases for same array
  //
  for(G4int i=0; i<nvar; ++i)
  {
    yIn[i] = yInput[i];
  }
     
  G4double h = Step * 0.5;
 
  // Do full step and two half steps
  //
  G4double yTemp2[7];
  AdvanceHelix(yIn, Bfld, h, yTemp2,yTemp);
  MagFieldEvaluate(yTemp2, Bfld_midpoint) ;     
  AdvanceHelix(yTemp2, Bfld_midpoint, h, yOut);
  SetAngCurve(GetAngCurve() * 2);
    
  // Error estimation
  //
  for(G4int i=0; i<nvar; ++i)
  {
    yErr[i] = yOut[i] - yTemp[i];
  }
}

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

Public Member Functions

Additional Inherited Members