Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/src/G4SextupoleMagField.cc

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 25 //
 26 // G4SextupoleMagField implementation
 27 //   by H. Burkhardt 23/10/2019
 28 // -------------------------------------------------------------------
 29 
 30 #include "G4SextupoleMagField.hh"
 31 #include "G4RotationMatrix.hh"
 32 
 33 // -------------------------------------------------------------------
 34 
 35 namespace
 36 {
 37    G4RotationMatrix IdentityMatrix;
 38 }
 39 
 40 G4SextupoleMagField::G4SextupoleMagField(G4double pGradient)
 41 {
 42    fGradient = pGradient;
 43    fpMatrix  = &IdentityMatrix;
 44 }
 45 
 46 G4SextupoleMagField::G4SextupoleMagField(G4double pGradient,
 47                                          const G4ThreeVector& pOrigin,
 48                                          G4RotationMatrix* pMatrix)
 49 {
 50   fGradient = pGradient ;
 51   fOrigin   = pOrigin ;
 52   fpMatrix  = pMatrix ;
 53 }
 54 
 55 G4Field* G4SextupoleMagField::Clone() const
 56 {
 57   return new G4SextupoleMagField(fGradient, fOrigin, fpMatrix);
 58 }
 59 
 60 // -------------------------------------------------------------------
 61 
 62 G4SextupoleMagField::~G4SextupoleMagField() = default;
 63 
 64 void G4SextupoleMagField::GetFieldValue( const G4double y[],         // [4]
 65                                                G4double B[]  ) const // [3]
 66 //  with displaced origin and rotation
 67 {
 68   G4ThreeVector r_global = G4ThreeVector(
 69                                          y[0] - fOrigin.x(),
 70                                          y[1] - fOrigin.y(),
 71                                          y[2] - fOrigin.z());
 72 
 73   const G4ThreeVector r_local = (*fpMatrix) * r_global;
 74   const G4ThreeVector B_local( fGradient * r_local.x() * r_local.y(),fGradient * ( std::pow(r_local.x(),2) - std::pow(r_local.y(),2) )/2 ,0);
 75   const G4ThreeVector B_global = fpMatrix->inverse() * B_local;
 76 
 77   B[0] = B_global.x() ;
 78   B[1] = B_global.y() ;
 79   B[2] = B_global.z() ;
 80 }
 81