field05/src/F05Field.cc

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0026 //
0027 /// \file field/field05/src/F05Field.cc
0028 /// \brief Implementation of the F05Field class
0029 //
0030
0031 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0032 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0033
0034 #include "F05Field.hh"
0035
0036 #include "G4SystemOfUnits.hh"
0037
0038 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0039
0040 void F05Field::GetFieldValue(const G4double Point[4], G4double* Bfield) const
0041 {
0042   // Point[0],Point[1],Point[2] are x-, y-, z-cordinates, Point[3] is time
0043
0044   const G4double Bz = 0.24 * tesla;
0045   const G4double Er = 2.113987E+6 * volt / m;
0046
0047   G4double Ex, Ey;
0048
0049   G4double posR = std::sqrt(std::pow(Point[0], 2) + std::pow(Point[1], 2));
0050   G4double cos_theta, sin_theta;
0051
0052   if (posR > 0) {
0053     cos_theta = Point[0] / (G4double)posR;
0054     sin_theta = Point[1] / (G4double)posR;
0055     Ex = -1 * Er * cos_theta;  // apply radial electric field
0056     Ey = -1 * Er * sin_theta;
0057   }
0058   else {
0059     Ex = 0;
0060     Ey = 0;
0061   }
0062
0063   Bfield[0] = 0;
0064   Bfield[1] = 0;
0065   Bfield[2] = Bz;
0066
0067   Bfield[3] = Ex;
0068   Bfield[4] = Ey;
0069   Bfield[5] = 0;
0070
0071   return;
0072 }