include/Geant4/G4MagHelicalStepper.icc

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0024 // ********************************************************************
0025 //
0026 // G4MagHelicalStepper inline methods implementation
0027 //
0028 // Created: J.Apostolakis, CERN - 05.11.1998
0029 // --------------------------------------------------------------------
0030
0031 inline void
0032 G4MagHelicalStepper::LinearStep( const G4double  yIn[],
0033                                        G4double  h,
0034                                        G4double  yLinear[]) const
0035 {
0036   // Linear Step in regions of no field
0037
0038   G4double momentum_val = std::sqrt(yIn[3]*yIn[3]+yIn[4]*yIn[4]+yIn[5]*yIn[5]);
0039   G4double inv_momentum = 1.0 / momentum_val;
0040   G4double yDir[3];
0041
0042   for( auto i = 0; i < 3; ++i )
0043   {
0044     yDir[i]   = inv_momentum * yIn[i+3];
0045     yLinear[i]   = yIn[i] + h * yDir[i];
0046     yLinear[i+3] = yIn[i+3];
0047   }
0048 }
0049
0050 inline void
0051 G4MagHelicalStepper::MagFieldEvaluate(const G4double y[],
0052                                       G4ThreeVector& Bfield )
0053 {
0054   G4double B[3];
0055   GetEquationOfMotion()->GetFieldValue(y, B);
0056   Bfield = G4ThreeVector( B[0], B[1], B[2] );
0057 }
0058
0059 inline G4double
0060 G4MagHelicalStepper::GetInverseCurve(const G4double Momentum,
0061                                      const G4double Bmag)
0062 {
0063   constexpr G4double chargeFactor = 1.0 / (CLHEP::eplus*CLHEP::c_light);
0064
0065   G4double  inv_momentum  = 1.0 / Momentum ;
0066   G4double particleCharge = fPtrMagEqOfMot->FCof() * chargeFactor;
0067   G4double fCoefficient   = -fUnitConstant  * particleCharge * inv_momentum;
0068
0069   return fCoefficient*Bmag;
0070 }
0071
0072 inline void G4MagHelicalStepper::SetAngCurve(const G4double Ang)
0073 {
0074   fAngCurve=Ang;
0075 }
0076
0077 inline G4double G4MagHelicalStepper::GetAngCurve() const
0078 {
0079   return fAngCurve;
0080 }
0081
0082 inline void G4MagHelicalStepper::SetCurve(const G4double Curve)
0083 {
0084   frCurve=Curve;
0085 }
0086
0087 inline G4double G4MagHelicalStepper::GetCurve() const
0088 {
0089   return frCurve;
0090 }
0091
0092 inline void G4MagHelicalStepper::SetRadHelix(const G4double Rad)
0093 {
0094   frHelix=Rad;
0095 }
0096
0097 inline G4double G4MagHelicalStepper::GetRadHelix() const
0098 {
0099   return frHelix;
0100 }