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25 // 25 //
26 // G4QuadrupoleMagField implementation <<
27 // 26 //
28 // 03.02.1997, V.Grichine - Created << 27 // $Id: G4QuadrupoleMagField.cc 68055 2013-03-13 14:43:28Z gcosmo $
29 // 11.05.2012, B.Riese - Allow displaced orig << 28 //
30 // ------------------------------------------- 29 // -------------------------------------------------------------------
31 30
32 #include "G4QuadrupoleMagField.hh" 31 #include "G4QuadrupoleMagField.hh"
33 #include "G4RotationMatrix.hh" 32 #include "G4RotationMatrix.hh"
34 33
35 namespace << 34 static G4RotationMatrix IdentityMatrix;
36 { <<
37 G4RotationMatrix IdentityMatrix; <<
38 } <<
39 35
40 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d 36 G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient)
41 { 37 {
42 fGradient = pGradient; << 38 fGradient = pGradient ;
>> 39 fOrigin = G4ThreeVector( 0.0, 0.0, 0.0) ;
43 fpMatrix = &IdentityMatrix; 40 fpMatrix = &IdentityMatrix;
44 } 41 }
45 42
46 // ------------------------------------------- << 43
>> 44 /////////////////////////////////////////////////////////////////////////
47 45
48 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d 46 G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient,
49 con << 47 G4ThreeVector pOrigin,
50 G4R 48 G4RotationMatrix* pMatrix)
51 { 49 {
52 fGradient = pGradient ; << 50 fGradient = pGradient ;
53 fOrigin = pOrigin ; << 51 fOrigin = pOrigin ;
54 fpMatrix = pMatrix ; << 52 fpMatrix = pMatrix ;
55 } 53 }
56 54
57 // ------------------------------------------- << 55 G4QuadrupoleMagField* G4QuadrupoleMagField::Clone() const
58 <<
59 G4Field* G4QuadrupoleMagField::Clone() const <<
60 { 56 {
61 return new G4QuadrupoleMagField(fGradient, << 57 //TODO: Can the fpMatrix be shared??
>> 58 return new G4QuadrupoleMagField(this->fGradient,
>> 59 this->fOrigin,
>> 60 this->fpMatrix);
62 } 61 }
63 62
64 // ------------------------------------------- << 63 /////////////////////////////////////////////////////////////////////////
65 64
66 G4QuadrupoleMagField::~G4QuadrupoleMagField() << 65 G4QuadrupoleMagField::~G4QuadrupoleMagField()
>> 66 {
>> 67 }
67 68
68 // ------------------------------------------- << 69 ////////////////////////////////////////////////////////////////////////
>> 70 // Allow displaced origin and rotation
>> 71 // Extensions by Björn Riese (GSI)
69 72
70 void G4QuadrupoleMagField::GetFieldValue( cons << 73 void G4QuadrupoleMagField::GetFieldValue( const G4double y[7],
71 << 74 G4double B[3] ) const
72 { 75 {
73 // with displaced origin and rotation << 76 G4ThreeVector r_global = G4ThreeVector(
74 << 77 y[0] - fOrigin.x(),
75 G4ThreeVector r_global = G4ThreeVector(y[0] << 78 y[1] - fOrigin.y(),
76 y[1] << 79 y[2] - fOrigin.z());
77 y[2] << 80
78 << 81 G4ThreeVector r_local = G4ThreeVector(
79 const G4ThreeVector r_local = (*fpMatrix) * << 82 fpMatrix->colX() * r_global,
80 const G4ThreeVector B_local( fGradient * r_l << 83 fpMatrix->colY() * r_global,
81 fGradient * r_l << 84 fpMatrix->colZ() * r_global);
82 const G4ThreeVector B_global = fpMatrix->inv << 85
83 << 86 G4ThreeVector B_local = G4ThreeVector(
84 B[0] = B_global.x(); << 87 fGradient * r_local.y(),
85 B[1] = B_global.y(); << 88 fGradient * r_local.x(),
86 B[2] = B_global.z(); << 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() ;
87 } 99 }
88 100