#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.

23 : G4EquationOfMotion(emField) {}

◆ ~MonopoleEquation()

MonopoleEquation::~MonopoleEquation ( )

override

Definition at line 27 of file MonopoleEquation.cc.

27 {}

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.

                                                                                                           {
   // 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;
 }

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

◆ SetChargeMomentumMass()

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

override

Definition at line 31 of file MonopoleEquation.cc.

                                                                                                                {
   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;
 }