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25 // 25 //
26 // G4QuadrupoleMagField implementation 26 // G4QuadrupoleMagField implementation
27 // 27 //
28 // 03.02.1997, V.Grichine - Created 28 // 03.02.1997, V.Grichine - Created
29 // 11.05.2012, B.Riese - Allow displaced orig 29 // 11.05.2012, B.Riese - Allow displaced origin and rotation
30 // ------------------------------------------- 30 // -------------------------------------------------------------------
31 31
32 #include "G4QuadrupoleMagField.hh" 32 #include "G4QuadrupoleMagField.hh"
33 #include "G4RotationMatrix.hh" 33 #include "G4RotationMatrix.hh"
34 34
35 namespace 35 namespace
36 { 36 {
37 G4RotationMatrix IdentityMatrix; 37 G4RotationMatrix IdentityMatrix;
38 } 38 }
39 39
40 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d 40 G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient)
41 { 41 {
42 fGradient = pGradient; 42 fGradient = pGradient;
43 fpMatrix = &IdentityMatrix; 43 fpMatrix = &IdentityMatrix;
44 } 44 }
45 45
46 // ------------------------------------------- 46 // -------------------------------------------------------------------
47 47
48 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d 48 G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient,
49 con << 49 G4ThreeVector pOrigin,
50 G4R 50 G4RotationMatrix* pMatrix)
51 { 51 {
52 fGradient = pGradient ; 52 fGradient = pGradient ;
53 fOrigin = pOrigin ; 53 fOrigin = pOrigin ;
54 fpMatrix = pMatrix ; 54 fpMatrix = pMatrix ;
55 } 55 }
56 56
57 // ------------------------------------------- 57 // -------------------------------------------------------------------
58 58
59 G4Field* G4QuadrupoleMagField::Clone() const 59 G4Field* G4QuadrupoleMagField::Clone() const
60 { 60 {
61 return new G4QuadrupoleMagField(fGradient, 61 return new G4QuadrupoleMagField(fGradient, fOrigin, fpMatrix);
62 } 62 }
63 63
64 // ------------------------------------------- 64 // -------------------------------------------------------------------
65 65
66 G4QuadrupoleMagField::~G4QuadrupoleMagField() << 66 G4QuadrupoleMagField::~G4QuadrupoleMagField()
>> 67 {
>> 68 }
67 69
68 // ------------------------------------------- 70 // -------------------------------------------------------------------
69 71
70 void G4QuadrupoleMagField::GetFieldValue( cons << 72 void G4QuadrupoleMagField::GetFieldValue( const G4double y[7],
71 << 73 G4double B[3] ) const
72 { 74 {
73 // with displaced origin and rotation 75 // with displaced origin and rotation
74 76
75 G4ThreeVector r_global = G4ThreeVector(y[0] 77 G4ThreeVector r_global = G4ThreeVector(y[0] - fOrigin.x(),
76 y[1] 78 y[1] - fOrigin.y(),
77 y[2] 79 y[2] - fOrigin.z());
78 80
79 const G4ThreeVector r_local = (*fpMatrix) * 81 const G4ThreeVector r_local = (*fpMatrix) * r_global;
80 const G4ThreeVector B_local( fGradient * r_l 82 const G4ThreeVector B_local( fGradient * r_local.y(),
81 fGradient * r_l 83 fGradient * r_local.x(), 0);
82 const G4ThreeVector B_global = fpMatrix->inv 84 const G4ThreeVector B_global = fpMatrix->inverse() * B_local;
83 85
84 B[0] = B_global.x(); 86 B[0] = B_global.x();
85 B[1] = B_global.y(); 87 B[1] = B_global.y();
86 B[2] = B_global.z(); 88 B[2] = B_global.z();
87 } 89 }
88 90