Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/src/G4MonopoleEq.cc

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 25 //
 26 // G4MonopoleEq implementation
 27 //
 28 // Created: V.Grichine, 17.11.2009
 29 // -------------------------------------------------------------------
 30 
 31 #include "G4MonopoleEq.hh"
 32 #include "globals.hh"
 33 #include "G4PhysicalConstants.hh"
 34 #include "G4SystemOfUnits.hh"
 35 
 36 G4MonopoleEq::G4MonopoleEq(G4ElectroMagneticField* emField )
 37   : G4EquationOfMotion( emField )
 38 {
 39 }
 40 
 41 G4MonopoleEq::~G4MonopoleEq() = default; 
 42 
 43 void  
 44 G4MonopoleEq::SetChargeMomentumMass(G4ChargeState particleCharge, // e+ units
 45                                     G4double,
 46                                     G4double particleMass)
 47 {
 48   G4double pcharge = particleCharge.GetCharge();
 49   fElectroMagCof =  eplus*pcharge;  // no *c_light as for ususal q
 50   fElectroMagCof /= 2*fine_structure_const;
 51 
 52   fMassCof = particleMass*particleMass ; 
 53 }
 54 
 55 void
 56 G4MonopoleEq::EvaluateRhsGivenB(const G4double y[],
 57                                 const G4double Field[],
 58                                       G4double dydx[] ) const
 59 {
 60 
 61    // Components of y:
 62    //    0-2 dr/ds, 
 63    //    3-5 d(pc)/ds - momentum derivatives 
 64 
 65    G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
 66 
 67    G4double Energy   = std::sqrt( pSquared + fMassCof );
 68    G4double cof2     = Energy*c_light ;
 69 
 70    G4double pModuleInverse  = 1.0/std::sqrt(pSquared) ;
 71 
 72    G4double inverse_velocity = Energy * pModuleInverse / c_light;
 73 
 74    G4double cof1     = fElectroMagCof*pModuleInverse ;
 75 
 76    dydx[0] = y[3]*pModuleInverse ;                         
 77    dydx[1] = y[4]*pModuleInverse ;                         
 78    dydx[2] = y[5]*pModuleInverse ;                        
 79 
 80    dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field[5] - y[5]*Field[4])) ;
 81    
 82    dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field[3] - y[3]*Field[5])) ; 
 83  
 84    dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field[4] - y[4]*Field[3])) ;  
 85 
 86    dydx[6] = 0.; //not used
 87 
 88    // Lab Time of flight
 89    //
 90    dydx[7] = inverse_velocity;
 91 
 92    return;
 93 }
 94