field05/src/F05Field.cc

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0025 //
0026 /// \file F05Field.cc
0027 /// \brief Implementation of the F05Field class
0028
0029 #include "F05Field.hh"
0030
0031 #include "G4SystemOfUnits.hh"
0032
0033 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0034
0035 void F05Field::GetFieldValue(const G4double Point[4], G4double* Bfield) const
0036 {
0037   // Point[0],Point[1],Point[2] are x-, y-, z-cordinates, Point[3] is time
0038
0039   const G4double Bz = 0.24 * tesla;
0040   const G4double Er = 2.113987E+6 * volt / m;
0041
0042   G4double Ex, Ey;
0043
0044   G4double posR = std::sqrt(std::pow(Point[0], 2) + std::pow(Point[1], 2));
0045   G4double cos_theta, sin_theta;
0046
0047   if (posR > 0) {
0048     cos_theta = Point[0] / (G4double)posR;
0049     sin_theta = Point[1] / (G4double)posR;
0050     Ex = -1 * Er * cos_theta;  // apply radial electric field
0051     Ey = -1 * Er * sin_theta;
0052   }
0053   else {
0054     Ex = 0;
0055     Ey = 0;
0056   }
0057
0058   Bfield[0] = 0;
0059   Bfield[1] = 0;
0060   Bfield[2] = Bz;
0061
0062   Bfield[3] = Ex;
0063   Bfield[4] = Ey;
0064   Bfield[5] = 0;
0065
0066   return;
0067 }