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1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4DELPHIMagField implementation <<
27 // 23 //
28 // Created: V.Grichine - 03.02.1997 << 24 // $Id: G4DELPHIMagField.cc,v 1.4 2003/10/31 14:35:53 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-06-00-patch-01 $
29 // ------------------------------------------- 26 // -------------------------------------------------------------------
30 27
31 #include "G4DELPHIMagField.hh" 28 #include "G4DELPHIMagField.hh"
32 #include "globals.hh" 29 #include "globals.hh"
33 #include "G4SystemOfUnits.hh" <<
34 30
35 G4DELPHIMagField::G4DELPHIMagField() = default << 31 G4DELPHIMagField::G4DELPHIMagField()
>> 32 {
>> 33 }
36 34
37 ////////////////////////////////////////////// 35 ////////////////////////////////////////////////////////////////////////
38 36
39 G4DELPHIMagField::~G4DELPHIMagField() = defaul << 37 G4DELPHIMagField::~G4DELPHIMagField()
40 <<
41 ////////////////////////////////////////////// <<
42 <<
43 G4Field* G4DELPHIMagField::Clone() const <<
44 { 38 {
45 return new G4DELPHIMagField; <<
46 } 39 }
47 40
48 ////////////////////////////////////////////// 41 ///////////////////////////////////////////////////////////////////////
49 42
50 void G4DELPHIMagField::GetFieldValue( const G4 << 43
51 G4 << 44 void G4DELPHIMagField::GetFieldValue( const G4double yTrack[7],
>> 45 G4double B[3] ) const
52 { 46 {
53 G4int i, n = 8 ; 47 G4int i, n = 8 ;
54 G4double a = 0.001 ; // mm -> m 48 G4double a = 0.001 ; // mm -> m
55 G4double x = a*yTrack[0], y = a*yTrack[1], 49 G4double x = a*yTrack[0], y = a*yTrack[1], z = a*yTrack[2] ;
56 G4double x2 = x*x, y2 = y*y, z2 = z*z, r2 = 50 G4double x2 = x*x, y2 = y*y, z2 = z*z, r2 = x2 + y2 ;
57 G4double r4 = r2*r2, z4 = z2*z2, r6 = r4*r2 51 G4double r4 = r2*r2, z4 = z2*z2, r6 = r4*r2, z6 = z4*z2 ;
58 G4double r8 = r4*r4, z8 = z4*z4, r10 = r8*r 52 G4double r8 = r4*r4, z8 = z4*z4, r10 = r8*r2, z10 = z8*z2 ;
59 G4double rz = z*std::sqrt(r2), r = std::sqr << 53 G4double rz = z*sqrt(r2), r = sqrt(r2+a*a) ;
60 G4double Br ; 54 G4double Br ;
61 G4double P[8], Q[8] ; 55 G4double P[8], Q[8] ;
62 static G4ThreadLocal G4double c[8] = << 56 static G4double c[8] = {
63 { <<
64 -9.26e-5, -3.51e-5 57 -9.26e-5, -3.51e-5, 2.94e-6, -1.10e-6,
65 6.25e-8, -1.77e-8 58 6.25e-8, -1.77e-8, -6.88e-10, -7.52e-11
66 } ; 59 } ;
67 P[0] = 2*rz ; 60 P[0] = 2*rz ;
68 P[1] = 4*rz*(r2 - 4.0*z2/3.0) ; 61 P[1] = 4*rz*(r2 - 4.0*z2/3.0) ;
69 P[2] = 6*rz*(r4 - 4*r2*z2 + 1.6*z4) ; 62 P[2] = 6*rz*(r4 - 4*r2*z2 + 1.6*z4) ;
70 P[3] = 8*rz*(r6 - 8*r4*z2 + 9.6*r2*z4 - 64. 63 P[3] = 8*rz*(r6 - 8*r4*z2 + 9.6*r2*z4 - 64.0*z6/35.0) ;
71 P[4] = 10*rz*(r8 - 40.0*r6*z2/3.0 + 32*r4*z 64 P[4] = 10*rz*(r8 - 40.0*r6*z2/3.0 + 32*r4*z4
72 - 128.0*r2*z6/7.0 + 128.0* 65 - 128.0*r2*z6/7.0 + 128.0*z8/63.0);
73 P[5] = 0 ; 66 P[5] = 0 ;
74 P[6] = 0 ; 67 P[6] = 0 ;
75 P[7] = 0 ; 68 P[7] = 0 ;
76 69
77 Q[0] = r2 - 2*z2 ; 70 Q[0] = r2 - 2*z2 ;
78 Q[1] = r4 - 8*r2*z2 + 8.0*z4/3.0 ; 71 Q[1] = r4 - 8*r2*z2 + 8.0*z4/3.0 ;
79 Q[2] = r6 - 18*r4*z2 + 24*r2*z4 - 3.2*z6 ; 72 Q[2] = r6 - 18*r4*z2 + 24*r2*z4 - 3.2*z6 ;
80 Q[3] = r8 - 32*r6*z2 + 96*r4*z4 - 51.2*r2*z 73 Q[3] = r8 - 32*r6*z2 + 96*r4*z4 - 51.2*r2*z6 +128.0*z8/35.0 ;
81 Q[4] = r10 - 50*r8*z2 + 800.0*r6*z4/3.0 - 3 74 Q[4] = r10 - 50*r8*z2 + 800.0*r6*z4/3.0 - 320*r4*z6
82 + 640.0*r2*z8/7.0 - 256.0*z10/63.0 ; 75 + 640.0*r2*z8/7.0 - 256.0*z10/63.0 ;
83 Q[5] = 0 ; 76 Q[5] = 0 ;
84 Q[6] = 0 ; 77 Q[6] = 0 ;
85 Q[7] = 0 ; 78 Q[7] = 0 ;
86 79
87 Br = 0 ; 80 Br = 0 ;
88 B[2] = 1.2*tesla ; // the principal Bz 81 B[2] = 1.2*tesla ; // the principal Bz value of DELPHI detector
89 for(i=0; i<n; ++i) << 82 for(i=0;i<n;i++)
90 { 83 {
91 Br += c[i]*P[i] ; 84 Br += c[i]*P[i] ;
92 B[2] += c[i]*Q[i] ; 85 B[2] += c[i]*Q[i] ;
93 } 86 }
94 B[0] = Br*x/r ; 87 B[0] = Br*x/r ;
95 B[1] = Br*y/r ; 88 B[1] = Br*y/r ;
96 return ; 89 return ;
97 } 90 }
98 91
99 // ------------------------------------------- 92 // -----------------------------------------------------------------
100 93