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1 // 1
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24 // *******************************************
25 //
26 // G4HarmonicPolMagField implementation
27 //
28 // Author: V.Grichine, 03.02.1997
29 // -------------------------------------------
30
31 #include "G4HarmonicPolMagField.hh"
32 #include "globals.hh"
33
34 G4HarmonicPolMagField::G4HarmonicPolMagField()
35
36 G4HarmonicPolMagField* G4HarmonicPolMagField::
37 {
38 return new G4HarmonicPolMagField;
39 }
40
41 // -------------------------------------------
42
43 G4HarmonicPolMagField::~G4HarmonicPolMagField(
44
45 // -------------------------------------------
46
47 void G4HarmonicPolMagField::GetFieldValue(cons
48
49 {
50 G4double a = 1.00 ; // mm -> m
51 G4double x = a*yTrack[0], y = a*yTrack[1],
52 G4double x2 = x*x, y2 = y*y, z2 = z*z ;
53 G4double x3 = x2*x, y3 = y2*y, z3 = z2*z ;
54 G4double xy = x*y, xz = x*z, yz = y*z, xyz
55 static G4ThreadLocal G4double
56 c[24] = {
57 .010, .010, .010,
58 .0001, .0001, .0001, .0001, .0001
59 .00001, .00001, .00001, .00001, .
60 .000001, .000001, .000001, .00000
61 .0000001, .0000001, .0000001
62 } ;
63
64 // for(auto i=0;i<24; ++i)
65 // {
66 // c[i] = 1.0*c[i] ;
67 // }
68 B[0] = c[1]
69 -2*c[3]*x + c[4]*z +c[6]*y -2*c[7]*x
70 -6*c[8]*xz + c[9]*(z2-x2) -2*c[10]*x
71 +c[13]*(y2-x2) - 6*c[14]*xy
72 -4*c[15]*(3*x*z2-x3) +c[16]*(z3-3*x2
73 -2*c[19]*(x*z2+x*y2-2*x3/3) + c[20]*
74 +c[22]*(y3-3*x2*y) - 4*c[23]*(3*x*y2
75
76 B[1] = c[2]
77 +c[5]*z + c[6]*x + 2*c[7]*y
78 +c[10]*(z2-x2) + c[11]*xz +2*c[12]*y
79 +c[17]*(z3-3*x2*z) + c[18]*(x*z2-x3/
80 +2*c[20]*xyz
81 +3*c[21]*z*(y2-x2) + c[22]*(3*x*y2-x
82
83 B[2] = c[0]
84 +c[3]*z + c[4]*x + c[5]*y
85 +3*c[8]*(z2-x2) + 2*c[9]*xz + 2*c[10
86 +4*c[15]*(z3-3*x2*z) + c[16]*(3*x*z2
87 +2*c[18]*xyz
88 +2*c[19]*z*(y2-x2) + c[20]*(x*y2-x3/
89 for(auto i=0; i<3 ; ++i)
90 {
91 B[i] = 0.1*B[i] ;
92 }
93 }
94
95 // -------------------------------------------
96