Geant4_10
G4QuadrupoleMagField.cc
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27 // $Id: G4QuadrupoleMagField.cc 68055 2013-03-13 14:43:28Z gcosmo $
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29 // -------------------------------------------------------------------
30 
31 #include "G4QuadrupoleMagField.hh"
32 #include "G4RotationMatrix.hh"
33 
34 static G4RotationMatrix IdentityMatrix;
35 
37 {
38  fGradient = pGradient ;
39  fOrigin = G4ThreeVector( 0.0, 0.0, 0.0) ;
40  fpMatrix = &IdentityMatrix;
41 }
42 
43 
45 
47  G4ThreeVector pOrigin,
48  G4RotationMatrix* pMatrix)
49 {
50  fGradient = pGradient ;
51  fOrigin = pOrigin ;
52  fpMatrix = pMatrix ;
53 }
54 
56 {
57  //TODO: Can the fpMatrix be shared??
58  return new G4QuadrupoleMagField(this->fGradient,
59  this->fOrigin,
60  this->fpMatrix);
61 }
62 
64 
66 {
67 }
68 
70 // Allow displaced origin and rotation
71 // Extensions by Björn Riese (GSI)
72 
74  G4double B[3] ) const
75 {
76  G4ThreeVector r_global = G4ThreeVector(
77  y[0] - fOrigin.x(),
78  y[1] - fOrigin.y(),
79  y[2] - fOrigin.z());
80 
81  G4ThreeVector r_local = G4ThreeVector(
82  fpMatrix->colX() * r_global,
83  fpMatrix->colY() * r_global,
84  fpMatrix->colZ() * r_global);
85 
86  G4ThreeVector B_local = G4ThreeVector(
87  fGradient * r_local.y(),
88  fGradient * r_local.x(),
89  0);
90 
91  G4ThreeVector B_global = G4ThreeVector(
92  fpMatrix->inverse().rowX() * B_local,
93  fpMatrix->inverse().rowY() * B_local,
94  fpMatrix->inverse().rowZ() * B_local);
95 
96  B[0] = B_global.x() ;
97  B[1] = B_global.y() ;
98  B[2] = B_global.z() ;
99 }
Hep3Vector rowY() const
Hep3Vector rowZ() const
CLHEP::Hep3Vector G4ThreeVector
double x() const
Hep3Vector colX() const
G4QuadrupoleMagField(G4double pGradient)
double z() const
HepRotation inverse() const
void GetFieldValue(const G4double yTrack[], G4double B[]) const
Double_t y
Definition: plot.C:279
Hep3Vector colZ() const
Hep3Vector colY() const
Hep3Vector rowX() const
double y() const
G4QuadrupoleMagField * Clone() const
double G4double
Definition: G4Types.hh:76