| Geant4 Cross Reference |
1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4QuadrupoleMagField implementation <<
27 // <<
28 // 03.02.1997, V.Grichine - Created <<
29 // 11.05.2012, B.Riese - Allow displaced orig <<
30 // ------------------------------------------- <<
31 <<
32 #include "G4QuadrupoleMagField.hh" 23 #include "G4QuadrupoleMagField.hh"
33 #include "G4RotationMatrix.hh" << 24 #include "globals.hh"
>> 25 #include "geomdefs.hh"
>> 26
34 27
35 namespace <<
36 { <<
37 G4RotationMatrix IdentityMatrix; <<
38 } <<
39 28
40 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d 29 G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient)
41 { 30 {
42 fGradient = pGradient; << 31 fGradient = pGradient ;
43 fpMatrix = &IdentityMatrix; <<
44 } 32 }
45 33
46 // ------------------------------------------- << 34 /////////////////////////////////////////////////////////////////////////
47 35
48 G4QuadrupoleMagField::G4QuadrupoleMagField(G4d << 36 G4QuadrupoleMagField::~G4QuadrupoleMagField()
49 con <<
50 G4R <<
51 { 37 {
52 fGradient = pGradient ; << 38 ;
53 fOrigin = pOrigin ; <<
54 fpMatrix = pMatrix ; <<
55 } 39 }
56 40
57 // ------------------------------------------- << 41 ////////////////////////////////////////////////////////////////////////
>> 42
58 43
59 G4Field* G4QuadrupoleMagField::Clone() const << 44 void
>> 45 G4QuadrupoleMagField::GetFieldValue( const G4double y[7],
>> 46 G4double B[3] ) const
60 { 47 {
61 return new G4QuadrupoleMagField(fGradient, << 48 // G4double fGradient = 0.001 ; // Tesla/mm
>> 49 B[0] = fGradient*y[1] ;
>> 50 B[1] = fGradient*y[0] ;
>> 51 B[2] = 0 ;
>> 52 return ;
62 } 53 }
63 54
64 // ------------------------------------------- <<
65 <<
66 G4QuadrupoleMagField::~G4QuadrupoleMagField() <<
67 55
68 // ------------------------------------------- <<
69 56
70 void G4QuadrupoleMagField::GetFieldValue( cons <<
71 <<
72 { <<
73 // with displaced origin and rotation <<
74 <<
75 G4ThreeVector r_global = G4ThreeVector(y[0] <<
76 y[1] <<
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 } <<
88 57