Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/src/G4LineCurrentMagField.cc

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 25 //
 26 // G4LineCurrentMagField implementation
 27 //
 28 // Author: V.Grichine, 03.02.1997
 29 // -------------------------------------------------------------------
 30 
 31 #include "G4LineCurrentMagField.hh"
 32 #include "globals.hh"
 33 
 34 G4LineCurrentMagField::G4LineCurrentMagField(G4double pFieldConstant)
 35 {
 36    fFieldConstant = pFieldConstant ;
 37 }
 38 
 39 // -----------------------------------------------------------------
 40 
 41 G4Field* G4LineCurrentMagField::Clone() const
 42 {
 43    return new G4LineCurrentMagField( fFieldConstant );
 44 }
 45 
 46 // -----------------------------------------------------------------
 47 
 48 G4LineCurrentMagField::~G4LineCurrentMagField() = default;
 49 
 50 // -----------------------------------------------------------------
 51 
 52 void G4LineCurrentMagField::GetFieldValue(const G4double yTrack[],       // [7]
 53                                                 G4double B[]     ) const // [3]
 54 {
 55    //   G4double fFieldConstant = 100 ;
 56    G4double a = 1.00 ;   // mm
 57    G4double x = a*yTrack[0], y = a*yTrack[1] ;
 58    G4double x2 = x*x, y2 = y*y, r2 = x2 + y2 ;
 59    G4double r = std::sqrt(r2+a*a) ;
 60    G4double Br = fFieldConstant/r;
 61    B[0] = -Br*y/r ;
 62    B[1] = Br*x/r ;
 63    B[2] = 0.0 ;
 64 }
 65 
 66 // -----------------------------------------------------------------
 67