G4EqGravityField Class Reference

G4EqGravityField implements the right-hand side of equation of motion in a gravity field. More...

#include <G4EqGravityField.hh>

Inheritance diagram for G4EqGravityField:

Public Member Functions
	G4EqGravityField (G4UniformGravityField *gField)
	~G4EqGravityField () 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

G4EqGravityField implements the right-hand side of equation of motion in a gravity field.

Definition at line 47 of file G4EqGravityField.hh.

Constructor & Destructor Documentation

G4EqGravityField()

G4EqGravityField::G4EqGravityField

(

G4UniformGravityField *

gField

)

Constructor for G4EqGravityField.

Parameters

[in]

gField

Pointer to the uniform gravity field.

Definition at line 39 of file G4EqGravityField.cc.

  : G4EquationOfMotion( gField )
{
}

~G4EqGravityField()

G4EqGravityField::~G4EqGravityField ( )

overridedefault

Default Destructor.

Member Function Documentation

EvaluateRhsGivenB()

void G4EqGravityField::EvaluateRhsGivenB ( const G4double y[], const G4double Field[], G4double dydx[] ) const

override

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

Parameters

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

Definition at line 53 of file G4EqGravityField.cc.

{
 
  // Components of y:
  //    0-2 dr/ds,
  //    3-5 dp/ds - momentum derivatives
 
  G4double momentum_mag_square = y[3]*y[3] + y[4]*y[4] + y[5]*y[5];
  G4double inv_momentum_magnitude = 1.0 / std::sqrt( momentum_mag_square );
 
  G4double Energy = std::sqrt(momentum_mag_square + fMass*fMass);
  G4double cof2 = Energy/c_light;
  G4double cof1 = inv_momentum_magnitude*fMass;
  G4double inverse_velocity = Energy*inv_momentum_magnitude/c_light;
 
  dydx[0] = y[3]*inv_momentum_magnitude;       //  (d/ds)x = Vx/V
  dydx[1] = y[4]*inv_momentum_magnitude;       //  (d/ds)y = Vy/V
  dydx[2] = y[5]*inv_momentum_magnitude;       //  (d/ds)z = Vz/V
 
  dydx[3] = G[0]*cof1*cof2/c_light;
  dydx[4] = G[1]*cof1*cof2/c_light;            //  m*g
  dydx[5] = G[2]*cof1*cof2/c_light;
 
  // Lab Time of flight
  //
  dydx[7] = inverse_velocity;
 
  return;
}

GetEquationType()

G4EquationType G4EqGravityField::GetEquationType ( ) const

inlineoverridevirtual

Returns the equation type-ID, "kEqGravity".

Reimplemented from G4EquationOfMotion.

Definition at line 87 of file G4EqGravityField.hh.

{ return kEqGravity; }

SetChargeMomentumMass()

void G4EqGravityField::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 45 of file G4EqGravityField.cc.

{
  fMass = particleMass;
}

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

• G4EqGravityField.hh
• G4EqGravityField.cc