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25 // 25 //
26 // G4SextupoleMagField implementation 26 // G4SextupoleMagField implementation
27 // by H. Burkhardt 23/10/2019 27 // by H. Burkhardt 23/10/2019
28 // ------------------------------------------- 28 // -------------------------------------------------------------------
29 29
30 #include "G4SextupoleMagField.hh" 30 #include "G4SextupoleMagField.hh"
31 #include "G4RotationMatrix.hh" 31 #include "G4RotationMatrix.hh"
32 32
33 // ------------------------------------------- 33 // -------------------------------------------------------------------
34 34
35 namespace 35 namespace
36 { 36 {
37 G4RotationMatrix IdentityMatrix; 37 G4RotationMatrix IdentityMatrix;
38 } 38 }
39 39
40 G4SextupoleMagField::G4SextupoleMagField(G4dou 40 G4SextupoleMagField::G4SextupoleMagField(G4double pGradient)
41 { 41 {
42 fGradient = pGradient; 42 fGradient = pGradient;
43 fpMatrix = &IdentityMatrix; 43 fpMatrix = &IdentityMatrix;
44 } 44 }
45 45
46 G4SextupoleMagField::G4SextupoleMagField(G4dou 46 G4SextupoleMagField::G4SextupoleMagField(G4double pGradient,
47 const << 47 G4ThreeVector pOrigin,
48 G4Rot 48 G4RotationMatrix* pMatrix)
49 { 49 {
50 fGradient = pGradient ; 50 fGradient = pGradient ;
51 fOrigin = pOrigin ; 51 fOrigin = pOrigin ;
52 fpMatrix = pMatrix ; 52 fpMatrix = pMatrix ;
53 } 53 }
54 54
55 G4Field* G4SextupoleMagField::Clone() const 55 G4Field* G4SextupoleMagField::Clone() const
56 { 56 {
57 return new G4SextupoleMagField(fGradient, fO 57 return new G4SextupoleMagField(fGradient, fOrigin, fpMatrix);
58 } 58 }
59 59
60 // ------------------------------------------- 60 // -------------------------------------------------------------------
61 61
62 G4SextupoleMagField::~G4SextupoleMagField() = << 62 G4SextupoleMagField::~G4SextupoleMagField()
>> 63 {
>> 64 }
63 65
64 void G4SextupoleMagField::GetFieldValue( const << 66 void G4SextupoleMagField::GetFieldValue( const G4double y[4],
65 << 67 G4double B[3] ) const
66 // with displaced origin and rotation 68 // with displaced origin and rotation
67 { 69 {
68 G4ThreeVector r_global = G4ThreeVector( 70 G4ThreeVector r_global = G4ThreeVector(
69 y[0] 71 y[0] - fOrigin.x(),
70 y[1] 72 y[1] - fOrigin.y(),
71 y[2] 73 y[2] - fOrigin.z());
72 74
73 const G4ThreeVector r_local = (*fpMatrix) * 75 const G4ThreeVector r_local = (*fpMatrix) * r_global;
74 const G4ThreeVector B_local( fGradient * r_l 76 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->inv 77 const G4ThreeVector B_global = fpMatrix->inverse() * B_local;
76 78
77 B[0] = B_global.x() ; 79 B[0] = B_global.x() ;
78 B[1] = B_global.y() ; 80 B[1] = B_global.y() ;
79 B[2] = B_global.z() ; 81 B[2] = B_global.z() ;
80 } 82 }
81 83