Geant4  10.01.p01
G4HarmonicPolMagField.cc
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27 // $Id: G4HarmonicPolMagField.cc 68055 2013-03-13 14:43:28Z gcosmo $
28 //
29 // -------------------------------------------------------------------
30 
31 #include "G4HarmonicPolMagField.hh"
32 #include "globals.hh"
33 
35 {
36 }
37 
39 {
40  return new G4HarmonicPolMagField;
41 }
43 
45 {
46 }
47 
49 
50 
52  G4double B[3] ) const
53 {
54  G4int i ;
55  G4double a = 1.00 ; // mm -> m
56  G4double x = a*yTrack[0], y = a*yTrack[1], z = a*yTrack[2] ;
57  G4double x2 = x*x, y2 = y*y, z2 = z*z ;
58  G4double x3 = x2*x, y3 = y2*y, z3 = z2*z ;
59  G4double xy = x*y, xz = x*z, yz = y*z, xyz = x*y*z ;
60  static G4ThreadLocal G4double
61  c[24] = {
62  .010, .010, .010, // 3(0)
63  .0001, .0001, .0001, .0001, .0001, // 5(1)
64  .00001, .00001, .00001, .00001, .00001, .00001, .00001, // 7(2)
65  .000001, .000001, .000001, .000001, .000001, .000001,
66  .0000001, .0000001, .0000001 // 9(3)
67  } ; // total : 24
68 
69  // for(i=0;i<24;i++)
70  // {
71  // c[i] = 1.0*c[i] ;
72  // }
73  B[0] = c[1]
74  -2*c[3]*x + c[4]*z +c[6]*y -2*c[7]*x
75  -6*c[8]*xz + c[9]*(z2-x2) -2*c[10]*xy + c[11]*yz - 2*c[12]*xz
76  +c[13]*(y2-x2) - 6*c[14]*xy
77  -4*c[15]*(3*x*z2-x3) +c[16]*(z3-3*x2*z) - 6*c[17]*xyz +c[18]*y*(z2-x2)
78  -2*c[19]*(x*z2+x*y2-2*x3/3) + c[20]*z*(y2-x2) - 6*c[21]*xyz
79  +c[22]*(y3-3*x2*y) - 4*c[23]*(3*x*y2-x3) ;
80 
81  B[1] = c[2]
82  +c[5]*z + c[6]*x + 2*c[7]*y
83  +c[10]*(z2-x2) + c[11]*xz +2*c[12]*yz +2*c[13]*xy + 3*c[14]*(y2-x2)
84  +c[17]*(z3-3*x2*z) + c[18]*(x*z2-x3/3) +2*c[19]*y*(z2-x2)
85  +2*c[20]*xyz
86  +3*c[21]*z*(y2-x2) + c[22]*(3*x*y2-x3) + 4*c[23]*(y3-3*x2*y) ;
87 
88  B[2] = c[0]
89  +c[3]*z + c[4]*x + c[5]*y
90  +3*c[8]*(z2-x2) + 2*c[9]*xz + 2*c[10]*yz + c[11]*xy + c[12]*(y2-x2)
91  +4*c[15]*(z3-3*x2*z) + c[16]*(3*x*z2-x3) + 3*c[17]*(y*z2-x2*y)
92  +2*c[18]*xyz
93  +2*c[19]*z*(y2-x2) + c[20]*(x*y2-x3/3) + c[21]*(y3-3*x2*y) ;
94  for(i=0;i<3;i++)
95  {
96  B[i] = 0.1*B[i] ;
97  }
98 }
99 
100 // -----------------------------------------------------------------
void GetFieldValue(const G4double yTrack[], G4double B[]) const
G4double z
Definition: TRTMaterials.hh:39
G4double a
Definition: TRTMaterials.hh:39
#define G4ThreadLocal
Definition: tls.hh:89
int G4int
Definition: G4Types.hh:78
double G4double
Definition: G4Types.hh:76
G4HarmonicPolMagField * Clone() const