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25 // 25 //
26 // G4TMagFieldEquation 26 // G4TMagFieldEquation
27 // 27 //
28 // Class description: 28 // Class description:
29 // 29 //
30 // Templated version of motion of quadrupole 30 // Templated version of motion of quadrupole magnetic field.
31 // Enables testing of inlined code for field, 31 // Enables testing of inlined code for field, equation, stepper, driver,
32 // avoiding all virtual calls. 32 // avoiding all virtual calls.
33 // 33 //
34 // ------------------------------------------- 34 // --------------------------------------------------------------------
35 // Created: Josh Xie (Google Summer of Code 2 35 // Created: Josh Xie (Google Summer of Code 2014 )
36 // Adapted from G4QuadrupoleMagField ( of Jun 36 // Adapted from G4QuadrupoleMagField ( of June 2014 .... )
37 // 37 //
38 38
39 #ifndef G4T_QUADRUPOLE_MAGFIELD_HH 39 #ifndef G4T_QUADRUPOLE_MAGFIELD_HH
40 #define G4T_QUADRUPOLE_MAGFIELD_HH 40 #define G4T_QUADRUPOLE_MAGFIELD_HH
41 41
42 #include "G4ThreeVector.hh" 42 #include "G4ThreeVector.hh"
43 #include "G4RotationMatrix.hh" 43 #include "G4RotationMatrix.hh"
44 #include "G4MagneticField.hh" 44 #include "G4MagneticField.hh"
45 45
46 static G4RotationMatrix IdentityMatrix; 46 static G4RotationMatrix IdentityMatrix;
47 47
48 class G4TQuadrupoleMagField : public G4Magneti 48 class G4TQuadrupoleMagField : public G4MagneticField
49 { 49 {
50 public: // with description 50 public: // with description
51 51
52 G4TQuadrupoleMagField(G4double pGradient) 52 G4TQuadrupoleMagField(G4double pGradient)
53 { 53 {
54 fGradient = pGradient ; 54 fGradient = pGradient ;
55 fOrigin = G4ThreeVector( 0.0, 0.0, 0.0) 55 fOrigin = G4ThreeVector( 0.0, 0.0, 0.0) ;
56 fpMatrix = &IdentityMatrix; 56 fpMatrix = &IdentityMatrix;
57 } 57 }
58 58
59 G4TQuadrupoleMagField(G4double pGradie 59 G4TQuadrupoleMagField(G4double pGradient,
60 G4ThreeVector pOrigin, 60 G4ThreeVector pOrigin,
61 G4RotationMatrix* pMatrix) 61 G4RotationMatrix* pMatrix)
62 { 62 {
63 fGradient = pGradient ; 63 fGradient = pGradient ;
64 fOrigin = pOrigin ; 64 fOrigin = pOrigin ;
65 fpMatrix = pMatrix ; 65 fpMatrix = pMatrix ;
66 } 66 }
67 67
68 virtual ~G4TQuadrupoleMagField() {;} 68 virtual ~G4TQuadrupoleMagField() {;}
69 69
70 inline void GetFieldValue(const G4doub 70 inline void GetFieldValue(const G4double y[7],
71 G4double B[3] ) const 71 G4double B[3] ) const
72 { 72 {
73 G4ThreeVector r_global = G4ThreeVe 73 G4ThreeVector r_global = G4ThreeVector(
74 y[0] - fOrigin.x(), 74 y[0] - fOrigin.x(),
75 y[1] - fOrigin.y(), 75 y[1] - fOrigin.y(),
76 y[2] - fOrigin.z()); 76 y[2] - fOrigin.z());
77 77
78 G4ThreeVector r_local = G4ThreeVec 78 G4ThreeVector r_local = G4ThreeVector(
79 fpMatrix->colX() * r_globa 79 fpMatrix->colX() * r_global,
80 fpMatrix->colY() * r_globa 80 fpMatrix->colY() * r_global,
81 fpMatrix->colZ() * r_globa 81 fpMatrix->colZ() * r_global);
82 82
83 G4ThreeVector B_local = G4ThreeVec 83 G4ThreeVector B_local = G4ThreeVector(
84 fGradient * r_local.y(), 84 fGradient * r_local.y(),
85 fGradient * r_local.x(), 85 fGradient * r_local.x(),
86 0); 86 0);
87 87
88 G4ThreeVector B_global = G4ThreeVe 88 G4ThreeVector B_global = G4ThreeVector(
89 fpMatrix->inverse().rowX() 89 fpMatrix->inverse().rowX() * B_local,
90 fpMatrix->inverse().rowY() 90 fpMatrix->inverse().rowY() * B_local,
91 fpMatrix->inverse().rowZ() 91 fpMatrix->inverse().rowZ() * B_local);
92 92
93 B[0] = B_global.x() ; 93 B[0] = B_global.x() ;
94 B[1] = B_global.y() ; 94 B[1] = B_global.y() ;
95 B[2] = B_global.z() ; 95 B[2] = B_global.z() ;
96 } 96 }
97 97
98 G4TQuadrupoleMagField* Clone() const 98 G4TQuadrupoleMagField* Clone() const
99 { 99 {
100 //TODO: Can the fpMatrix be shared 100 //TODO: Can the fpMatrix be shared??
101 return new G4TQuadrupoleMagField(t 101 return new G4TQuadrupoleMagField(this->fGradient,
102 this->fOrigin, 102 this->fOrigin,
103 this->fpMatrix); 103 this->fpMatrix);
104 } 104 }
105 105
106 private: 106 private:
107 107
108 G4double fGradient; 108 G4double fGradient;
109 G4ThreeVector fOrigin; 109 G4ThreeVector fOrigin;
110 G4RotationMatrix* fpMatrix; 110 G4RotationMatrix* fpMatrix;
111 }; 111 };
112 #endif 112 #endif
113 113
114 114