Gabriele Cosmo
156 lines
6.2 KiB
C++
156 lines
6.2 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file exoticphysics/monopole/src/G4MonopoleEquation.cc
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/// \brief Implementation of the G4MonopoleEquation class
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//
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//
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//
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// class G4MonopoleEquation
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//
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// Class description:
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//
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//
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// This is the standard right-hand side for equation of motion.
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//
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// The only case another is required is when using a moving reference
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// frame ... or extending the class to include additional Forces,
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// eg an electric field
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//
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// 10.11.98 V.Grichine
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//
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// 30.04.10 S.Burdin (modified to use for the monopole trajectories).
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//
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// 15.06.10 B.Bozsogi (replaced the hardcoded magnetic charge with
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// the one passed by G4MonopoleTransportation)
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// +workaround to pass the electric charge.
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//
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// 12.07.10 S.Burdin (added equations for the electric charges)
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// -------------------------------------------------------------------
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#include "G4MonopoleEquation.hh"
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#include "globals.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include <iomanip>
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4MonopoleEquation::G4MonopoleEquation(G4MagneticField *emField )
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: G4EquationOfMotion( emField )
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{
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G4cout << "G4MonopoleEquation::G4MonopoleEquation" << G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4MonopoleEquation::~G4MonopoleEquation()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void
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G4MonopoleEquation::SetChargeMomentumMass( G4ChargeState particleChargeState,
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G4double , // momentum,
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G4double particleMass)
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{
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G4double particleMagneticCharge= particleChargeState.MagneticCharge();
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G4double particleElectricCharge= particleChargeState.GetCharge();
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// fElCharge = particleElectricCharge;
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fElCharge =eplus* particleElectricCharge*c_light;
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fMagCharge = eplus*particleMagneticCharge*c_light ;
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// G4cout << " G4MonopoleEquation: ElectricCharge=" << particleElectricCharge
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// << "; MagneticCharge=" << particleMagneticCharge
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// << G4endl;
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fMassCof = particleMass*particleMass ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void
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G4MonopoleEquation::EvaluateRhsGivenB(const G4double y[],
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const G4double Field[],
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G4double dydx[] ) const
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{
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// Components of y:
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// 0-2 dr/ds,
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// 3-5 dp/ds - momentum derivatives
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G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
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G4double Energy = std::sqrt( pSquared + fMassCof );
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G4double pModuleInverse = 1.0/std::sqrt(pSquared);
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G4double inverse_velocity = Energy * pModuleInverse / c_light;
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G4double cofEl = fElCharge * pModuleInverse ;
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G4double cofMag = fMagCharge * Energy * pModuleInverse;
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dydx[0] = y[3]*pModuleInverse ;
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dydx[1] = y[4]*pModuleInverse ;
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dydx[2] = y[5]*pModuleInverse ;
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// G4double magCharge = twopi * hbar_Planck / (eplus * mu0);
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// magnetic charge in SI units A*m convention
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// see http://en.wikipedia.org/wiki/Magnetic_monopole
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// G4cout << "Magnetic charge: " << magCharge << G4endl;
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// dp/ds = dp/dt * dt/ds = dp/dt / v = Force / velocity
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// dydx[3] = fMagCharge * Field[0] * inverse_velocity * c_light;
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// multiplied by c_light to convert to MeV/mm
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// dydx[4] = fMagCharge * Field[1] * inverse_velocity * c_light;
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// dydx[5] = fMagCharge * Field[2] * inverse_velocity * c_light;
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dydx[3] = cofMag * Field[0] + cofEl * (y[4]*Field[2] - y[5]*Field[1]);
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dydx[4] = cofMag * Field[1] + cofEl * (y[5]*Field[0] - y[3]*Field[2]);
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dydx[5] = cofMag * Field[2] + cofEl * (y[3]*Field[1] - y[4]*Field[0]);
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// G4cout << std::setprecision(5)<< "E=" << Energy
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// << "; p="<< 1/pModuleInverse
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// << "; mC="<< magCharge
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// <<"; x=" << y[0]
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// <<"; y=" << y[1]
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// <<"; z=" << y[2]
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// <<"; dydx[3]=" << dydx[3]
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// <<"; dydx[4]=" << dydx[4]
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// <<"; dydx[5]=" << dydx[5]
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// << G4endl;
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dydx[6] = 0.;//not used
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// Lab Time of flight
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dydx[7] = inverse_velocity;
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return;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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