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25 // 25 //
26 // G4QuadrupoleMagField implementation <<
27 // 26 //
28 // 03.02.1997, V.Grichine - Created << 27 // $Id: G4QuadrupoleMagField.cc,v 1.4 2006/06/29 18:24:46 gunter Exp $
29 // 11.05.2012, B.Riese - Allow displaced orig << 28 // GEANT4 tag $Name: geant4-09-02 $
>> 29 //
30 // ------------------------------------------- 30 // -------------------------------------------------------------------
31 31
32 #include "G4QuadrupoleMagField.hh" 32 #include "G4QuadrupoleMagField.hh"
33 #include "G4RotationMatrix.hh" <<
34 <<
35 namespace <<
36 { <<
37 G4RotationMatrix IdentityMatrix; <<
38 } <<
39 33
40 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d 34 G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient)
41 { 35 {
42 fGradient = pGradient; <<
43 fpMatrix = &IdentityMatrix; <<
44 } <<
45 <<
46 // ------------------------------------------- <<
47 <<
48 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d <<
49 con <<
50 G4R <<
51 { <<
52 fGradient = pGradient ; 36 fGradient = pGradient ;
53 fOrigin = pOrigin ; <<
54 fpMatrix = pMatrix ; <<
55 } 37 }
56 38
57 // ------------------------------------------- << 39 /////////////////////////////////////////////////////////////////////////
58 40
59 G4Field* G4QuadrupoleMagField::Clone() const << 41 G4QuadrupoleMagField::~G4QuadrupoleMagField()
60 { 42 {
61 return new G4QuadrupoleMagField(fGradient, <<
62 } 43 }
63 44
64 // ------------------------------------------- << 45 ////////////////////////////////////////////////////////////////////////
65 <<
66 G4QuadrupoleMagField::~G4QuadrupoleMagField() <<
67 46
68 // ------------------------------------------- << 47 void G4QuadrupoleMagField::GetFieldValue( const G4double y[7],
69 << 48 G4double B[3] ) const
70 void G4QuadrupoleMagField::GetFieldValue( cons <<
71 <<
72 { 49 {
73 // with displaced origin and rotation << 50 // G4double fGradient = 0.001 ; // Tesla/mm
74 << 51 B[0] = fGradient*y[1] ;
75 G4ThreeVector r_global = G4ThreeVector(y[0] << 52 B[1] = fGradient*y[0] ;
76 y[1] << 53 B[2] = 0 ;
77 y[2] <<
78 <<
79 const G4ThreeVector r_local = (*fpMatrix) * <<
80 const G4ThreeVector B_local( fGradient * r_l <<
81 fGradient * r_l <<
82 const G4ThreeVector B_global = fpMatrix->inv <<
83 <<
84 B[0] = B_global.x(); <<
85 B[1] = B_global.y(); <<
86 B[2] = B_global.z(); <<
87 } 54 }
88 55