G4MonopoleEq Class Reference

G4MonopoleEq defines the right-hand side of equation of motion for monopole in a combined electric and magnetic field: d(p_c)/ds=g{c-energyB_ - p_c x E}/pc. More...

#include <G4MonopoleEq.hh>

Inheritance diagram for G4MonopoleEq:

Public Member Functions
	G4MonopoleEq (G4ElectroMagneticField *emField)
	~G4MonopoleEq () override=default
void	SetChargeMomentumMass (G4ChargeState particleCharge, G4double MomentumXc, G4double mass) override
void	EvaluateRhsGivenB (const G4double y[], const G4double Field[], G4double dydx[]) const override
G4EquationType	GetEquationType () const override
Public Member Functions inherited from G4EquationOfMotion
	G4EquationOfMotion (G4Field *Field)
virtual	~G4EquationOfMotion ()=default
virtual void	EvaluateRhsGivenB (const G4double y[], const G4double B[3], G4double dydx[]) const =0
void	RightHandSide (const G4double y[], G4double dydx[]) const
void	EvaluateRhsReturnB (const G4double y[], G4double dydx[], G4double Field[]) const
void	GetFieldValue (const G4double Point[4], G4double Field[]) const
const G4Field *	GetFieldObj () const
G4Field *	GetFieldObj ()
void	SetFieldObj (G4Field *pField)

Detailed Description

G4MonopoleEq defines the right-hand side of equation of motion for monopole in a combined electric and magnetic field: d(p_c)/ds=g{c-energyB_ - p_c x E}/pc.

Definition at line 49 of file G4MonopoleEq.hh.

Constructor & Destructor Documentation

G4MonopoleEq()

G4MonopoleEq::G4MonopoleEq

(

G4ElectroMagneticField *

emField

)

Constructor for G4MonopoleEq.

Parameters

[in]

emField

Pointer to the field.

Definition at line 36 of file G4MonopoleEq.cc.

  : G4EquationOfMotion( emField )
{
}

~G4MonopoleEq()

G4MonopoleEq::~G4MonopoleEq ( )

overridedefault

Default Destructor.

Member Function Documentation

EvaluateRhsGivenB()

void G4MonopoleEq::EvaluateRhsGivenB ( const G4double y[], const G4double Field[], G4double dydx[] ) const

override

Calculates the value of the derivative, given the value of the field.

Parameters

[in]	y	Coefficients array.
[in]	Field	Field value.
[out]	dydx	Derivatives array.

Definition at line 54 of file G4MonopoleEq.cc.

{
 
   // Components of y:
   //    0-2 dr/ds, 
   //    3-5 d(pc)/ds - momentum derivatives 
 
   G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
 
   G4double Energy   = std::sqrt( pSquared + fMassCof );
   G4double cof2     = Energy*c_light ;
 
   G4double pModuleInverse  = 1.0/std::sqrt(pSquared) ;
 
   G4double inverse_velocity = Energy * pModuleInverse / c_light;
 
   G4double cof1     = fElectroMagCof*pModuleInverse ;
 
   dydx[0] = y[3]*pModuleInverse ;                         
   dydx[1] = y[4]*pModuleInverse ;                         
   dydx[2] = y[5]*pModuleInverse ;                        
 
   dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field[5] - y[5]*Field[4])) ;
   
   dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field[3] - y[3]*Field[5])) ; 
 
   dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field[4] - y[4]*Field[3])) ;  
 
   dydx[6] = 0.; //not used
 
   // Lab Time of flight
   //
   dydx[7] = inverse_velocity;
 
   return;
}

GetEquationType()

G4EquationType G4MonopoleEq::GetEquationType ( ) const

inlineoverridevirtual

Returns the equation type-ID, "kEqMonopole".

Reimplemented from G4EquationOfMotion.

Definition at line 88 of file G4MonopoleEq.hh.

{ return kEqMonopole; }

SetChargeMomentumMass()

void G4MonopoleEq::SetChargeMomentumMass ( G4ChargeState particleCharge, G4double MomentumXc, G4double mass )

overridevirtual

Sets the charge, momentum and mass of the current particle. Used to set the equation's coefficients.

Parameters

[in]	particleCharge	Magnetic charge and moments in e+ units.
[in]	MomentumXc	Particle momentum.
[in]	mass	Particle mass.

Implements G4EquationOfMotion.

Definition at line 42 of file G4MonopoleEq.cc.

{
  G4double pcharge = particleCharge.GetCharge();
  fElectroMagCof =  eplus*pcharge;  // no *c_light as for ususal q
  fElectroMagCof /= 2*fine_structure_const;
 
  fMassCof = particleMass*particleMass ; 
}

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

• G4MonopoleEq.hh
• G4MonopoleEq.cc