Geant4 Cross Reference

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Geant4/examples/extended/field/field05/src/F05Field.cc

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 26 //
 27 /// \file field/field05/src/F05Field.cc
 28 /// \brief Implementation of the F05Field class
 29 //
 30 
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 33 
 34 #include "F05Field.hh"
 35 
 36 #include "G4SystemOfUnits.hh"
 37 
 38 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 39 
 40 void F05Field::GetFieldValue(const G4double Point[4], G4double* Bfield) const
 41 {
 42   // Point[0],Point[1],Point[2] are x-, y-, z-cordinates, Point[3] is time
 43 
 44   const G4double Bz = 0.24 * tesla;
 45   const G4double Er = 2.113987E+6 * volt / m;
 46 
 47   G4double Ex, Ey;
 48 
 49   G4double posR = std::sqrt(std::pow(Point[0], 2) + std::pow(Point[1], 2));
 50   G4double cos_theta, sin_theta;
 51 
 52   if (posR > 0) {
 53     cos_theta = Point[0] / (G4double)posR;
 54     sin_theta = Point[1] / (G4double)posR;
 55     Ex = -1 * Er * cos_theta;  // apply radial electric field
 56     Ey = -1 * Er * sin_theta;
 57   }
 58   else {
 59     Ex = 0;
 60     Ey = 0;
 61   }
 62 
 63   Bfield[0] = 0;
 64   Bfield[1] = 0;
 65   Bfield[2] = Bz;
 66 
 67   Bfield[3] = Ex;
 68   Bfield[4] = Ey;
 69   Bfield[5] = 0;
 70 
 71   return;
 72 }
 73