MonopoleEquation Class Reference

#include <MonopoleEquation.h>

Inheritance diagram for MonopoleEquation:

Public Member Functions
void	EvaluateRhsGivenB (const G4double y[], const G4double Field[], G4double dydx[]) const override
	MonopoleEquation (G4MagneticField *emField)
void	SetChargeMomentumMass (G4ChargeState particleChargeState, G4double momentum, G4double mass) override
	~MonopoleEquation () override

Private Attributes
G4double	fElCharge
G4double	fMagCharge
G4double	fMassCof

Detailed Description

Definition at line 28 of file MonopoleEquation.h.

Constructor & Destructor Documentation

MonopoleEquation()

MonopoleEquation::MonopoleEquation

(

G4MagneticField *

emField

)

Definition at line 23 of file MonopoleEquation.cc.

: G4EquationOfMotion(emField) {}

~MonopoleEquation()

MonopoleEquation::~MonopoleEquation ( )

override

Definition at line 27 of file MonopoleEquation.cc.

{}

Member Function Documentation

EvaluateRhsGivenB()

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

override

Definition at line 48 of file MonopoleEquation.cc.

References EcalCondDBWriter_cfi::Energy, fElCharge, fMagCharge, fMassCof, mathSSE::sqrt(), and y.

                                                                                                          {
  // Components of y:
  //    0-2 dr/ds,
  //    3-5 dp/ds - momentum derivatives

  G4double pSquared = y[3] * y[3] + y[4] * y[4] + y[5] * y[5];

  G4double Energy = std::sqrt(pSquared + fMassCof);

  G4double pModuleInverse = 1.0 / std::sqrt(pSquared);

  G4double inverse_velocity = Energy * pModuleInverse / CLHEP::c_light;

  G4double cofEl = fElCharge * pModuleInverse;
  G4double cofMag = fMagCharge * Energy * pModuleInverse;

  dydx[0] = y[3] * pModuleInverse;
  dydx[1] = y[4] * pModuleInverse;
  dydx[2] = y[5] * pModuleInverse;

  // G4double magCharge = twopi * hbar_Planck / (eplus * mu0);
  // magnetic charge in SI units A*m convention
  //  see http://en.wikipedia.org/wiki/Magnetic_monopole
  //   G4cout  << "Magnetic charge:  " << magCharge << G4endl;
  // dp/ds = dp/dt * dt/ds = dp/dt / v = Force / velocity
  // dydx[3] = fMagCharge * Field[0]  * inverse_velocity  * c_light;
  // multiplied by c_light to convert to MeV/mm
  //     dydx[4] = fMagCharge * Field[1]  * inverse_velocity  * c_light;
  //     dydx[5] = fMagCharge * Field[2]  * inverse_velocity  * c_light;

  dydx[3] = cofMag * Field[0] + cofEl * (y[4] * Field[2] - y[5] * Field[1]);
  dydx[4] = cofMag * Field[1] + cofEl * (y[5] * Field[0] - y[3] * Field[2]);
  dydx[5] = cofMag * Field[2] + cofEl * (y[3] * Field[1] - y[4] * Field[0]);

  //        G4cout << std::setprecision(5)<< "E=" << Energy
  //               << "; p="<< 1/pModuleInverse
  //               << "; mC="<< magCharge
  //               <<"; x=" << y[0]
  //               <<"; y=" << y[1]
  //               <<"; z=" << y[2]
  //               <<"; dydx[3]=" << dydx[3]
  //               <<"; dydx[4]=" << dydx[4]
  //               <<"; dydx[5]=" << dydx[5]
  //               << G4endl;

  dydx[6] = 0.;  // not used

  // Lab Time of flight
  dydx[7] = inverse_velocity;
  return;
}

SetChargeMomentumMass()

void MonopoleEquation::SetChargeMomentumMass ( G4ChargeState  particleChargeState, G4double  momentum, G4double  mass  )

override

Definition at line 31 of file MonopoleEquation.cc.

References fElCharge, fMagCharge, and fMassCof.

                                                                                                               {
  G4double particleMagneticCharge = particleChargeState.MagneticCharge();
  G4double particleElectricCharge = particleChargeState.GetCharge();

  fElCharge = CLHEP::eplus * particleElectricCharge * CLHEP::c_light;

  fMagCharge = CLHEP::eplus * particleMagneticCharge * CLHEP::c_light;

  // G4cout << " MonopoleEquation: ElectricCharge=" << particleElectricCharge
  //           << "; MagneticCharge=" << particleMagneticCharge
  //           << G4endl;

  fMassCof = particleMass * particleMass;
}

Member Data Documentation

fElCharge

G4double MonopoleEquation::fElCharge

private

Definition at line 43 of file MonopoleEquation.h.

Referenced by EvaluateRhsGivenB(), and SetChargeMomentumMass().

fMagCharge

G4double MonopoleEquation::fMagCharge

private

Definition at line 42 of file MonopoleEquation.h.

Referenced by EvaluateRhsGivenB(), and SetChargeMomentumMass().

fMassCof

G4double MonopoleEquation::fMassCof

private

Definition at line 44 of file MonopoleEquation.h.

Referenced by EvaluateRhsGivenB(), and SetChargeMomentumMass().