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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()
49 {
50 }
51 
52 // -----------------------------------------------------------------
53 
54 void G4LineCurrentMagField::GetFieldValue( const G4double yTrack[7],
55  G4double B[3] ) const
56 {
57  // G4double fFieldConstant = 100 ;
58  G4double a = 1.00 ; // mm
59  G4double x = a*yTrack[0], y = a*yTrack[1] ;
60  G4double x2 = x*x, y2 = y*y, r2 = x2 + y2 ;
61  G4double r = std::sqrt(r2+a*a) ;
62  G4double Br = fFieldConstant/r;
63  B[0] = -Br*y/r ;
64  B[1] = Br*x/r ;
65  B[2] = 0.0 ;
66 }
67 
68 // -----------------------------------------------------------------