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25 // 25 //
26 // G4QuadrupoleMagField implementation <<
27 // 26 //
28 // 03.02.1997, V.Grichine - Created << 27 // $Id: G4QuadrupoleMagField.cc 69786 2013-05-15 09:38:51Z 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; <<
43 fpMatrix = &IdentityMatrix; <<
44 } <<
45 <<
46 // ------------------------------------------- <<
47 38
48 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d <<
49 con <<
50 G4R <<
51 { <<
52 fGradient = pGradient ; 39 fGradient = pGradient ;
53 fOrigin = pOrigin ; << 40 fOrigin = G4ThreeVector( 0.0, 0.0, 0.0) ;
54 fpMatrix = pMatrix ; << 41 fpMatrix = &IdentityMatrix;
55 } 42 }
56 43
57 // ------------------------------------------- << 44 /////////////////////////////////////////////////////////////////////////
58 45
59 G4Field* G4QuadrupoleMagField::Clone() const << 46 G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient, G4ThreeVector
>> 47 pOrigin, G4RotationMatrix* pMatrix)
60 { 48 {
61 return new G4QuadrupoleMagField(fGradient, << 49 fGradient = pGradient ;
>> 50 fOrigin = pOrigin ;
>> 51 fpMatrix = pMatrix ;
62 } 52 }
63 53
64 // ------------------------------------------- << 54 /////////////////////////////////////////////////////////////////////////
65 55
66 G4QuadrupoleMagField::~G4QuadrupoleMagField() << 56 G4QuadrupoleMagField::~G4QuadrupoleMagField()
>> 57 {
>> 58 }
67 59
68 // ------------------------------------------- << 60 ////////////////////////////////////////////////////////////////////////
>> 61 // Allow displaced origin and rotation
>> 62 // Extensions by Björn Riese (GSI)
69 63
70 void G4QuadrupoleMagField::GetFieldValue( cons << 64 void G4QuadrupoleMagField::GetFieldValue( const G4double y[7],
71 << 65 G4double B[3] ) const
72 { 66 {
73 // with displaced origin and rotation <<
74 67
75 G4ThreeVector r_global = G4ThreeVector(y[0] << 68 G4ThreeVector r_global = G4ThreeVector(
76 y[1] << 69 y[0] - fOrigin.x(),
77 y[2] << 70 y[1] - fOrigin.y(),
78 << 71 y[2] - fOrigin.z());
79 const G4ThreeVector r_local = (*fpMatrix) * << 72
80 const G4ThreeVector B_local( fGradient * r_l << 73 G4ThreeVector r_local = G4ThreeVector(
81 fGradient * r_l << 74 fpMatrix->colX() * r_global,
82 const G4ThreeVector B_global = fpMatrix->inv << 75 fpMatrix->colY() * r_global,
83 << 76 fpMatrix->colZ() * r_global);
84 B[0] = B_global.x(); << 77
85 B[1] = B_global.y(); << 78 G4ThreeVector B_local = G4ThreeVector(
86 B[2] = B_global.z(); << 79 fGradient * r_local.y(),
>> 80 fGradient * r_local.x(),
>> 81 0);
>> 82
>> 83 G4ThreeVector B_global = G4ThreeVector(
>> 84 fpMatrix->inverse().rowX() * B_local,
>> 85 fpMatrix->inverse().rowY() * B_local,
>> 86 fpMatrix->inverse().rowZ() * B_local);
>> 87
>> 88 B[0] = B_global.x() ;
>> 89 B[1] = B_global.y() ;
>> 90 B[2] = B_global.z() ;
87 } 91 }
88 92