G4LineCurrentMagField.cc

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00025 //
00026 // $Id: G4LineCurrentMagField.cc 69786 2013-05-15 09:38:51Z gcosmo $
00027 // -------------------------------------------------------------------
00028 
00029 #include "G4LineCurrentMagField.hh"
00030 #include "globals.hh"
00031 
00032 G4LineCurrentMagField::G4LineCurrentMagField(G4double pFieldConstant)
00033 {
00034    fFieldConstant = pFieldConstant ;
00035 }
00037 
00038 G4LineCurrentMagField::~G4LineCurrentMagField()
00039 {
00040 }
00041 
00043 
00044 
00045 void G4LineCurrentMagField::GetFieldValue( const G4double yTrack[7],
00046                                                  G4double B[3]      ) const  
00047 {
00048    //   G4double fFieldConstant = 100 ;
00049    G4double a = 1.00 ;   // mm
00050    G4double x = a*yTrack[0], y = a*yTrack[1] ;
00051    G4double x2 = x*x, y2 = y*y, r2 = x2 + y2 ;
00052    G4double r = std::sqrt(r2+a*a) ;
00053    G4double Br = fFieldConstant/r;
00054    B[0] = -Br*y/r ;
00055    B[1] = Br*x/r ;
00056    B[2] = 0 ;
00057 }
00058 
00059 // -----------------------------------------------------------------

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