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1 // 1 //
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19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 ////////////////////////////////////////////// 23 ///////////////////////////////////////////////////////////////////////////////
27 // File: CCalMagneticField.cc 24 // File: CCalMagneticField.cc
28 // Description: User Field class implementatio 25 // Description: User Field class implementation.
29 ////////////////////////////////////////////// 26 ///////////////////////////////////////////////////////////////////////////////
30 #include <fstream> <<
31 <<
32 #include "CCalMagneticField.hh" 27 #include "CCalMagneticField.hh"
33 #include "CCalutils.hh" 28 #include "CCalutils.hh"
34 #include "G4SystemOfUnits.hh" <<
35 #include "G4FieldManager.hh" 29 #include "G4FieldManager.hh"
>> 30 #include <fstream>
36 31
37 //#define ddebug 32 //#define ddebug
38 //#define debug 33 //#define debug
39 34
40 //Constructor and destructor: 35 //Constructor and destructor:
41 36
42 CCalMagneticField::CCalMagneticField(const G4S 37 CCalMagneticField::CCalMagneticField(const G4String &filename) :
43 fval(0), pos(0), slope(0), intercept(0) << 38 fval(0), pos(0), slope(0), intercept(0) {
44 { <<
45 #ifdef debug <<
46 fVerbosity = 1; <<
47 #else <<
48 fVerbosity = 0; <<
49 #endif <<
50 39
51 //Let's open the file 40 //Let's open the file
52 G4cout << " ==> Opening file " << filename < 41 G4cout << " ==> Opening file " << filename << " to read magnetic field..."
53 << G4endl; << 42 << G4endl;
54 G4String pathName = std::getenv("CCAL_GLOBAL << 43 G4String pathName = getenv("CCAL_GLOBALPATH");
55 std::ifstream is; 44 std::ifstream is;
56 G4bool ok = openGeomFile(is, pathName, filen << 45 bool ok = openGeomFile(is, pathName, filename);
57 << 46
58 if (ok) { 47 if (ok) {
59 findDO(is, G4String("FLDM")); 48 findDO(is, G4String("FLDM"));
60 is >> fval >> npts >> xoff; 49 is >> fval >> npts >> xoff;
61 << 50 #ifdef debug
62 if (fVerbosity) << 51 G4cout << "Field value " << fval << " # points " << npts << " offset in x "
63 G4cout << "Field value " << fval << " # << 52 << xoff*mm << G4endl;
64 " offset in x " << 53 #endif
65 << xoff*mm << G4endl; <<
66 54
67 if (npts > 0) { 55 if (npts > 0) {
68 pos = new G4double[npts]; 56 pos = new G4double[npts];
69 slope = new G4double[npts]; 57 slope = new G4double[npts];
70 intercept = new G4double[npts]; 58 intercept = new G4double[npts];
71 59
72 for (G4int i = 0; i < npts; i++) { 60 for (G4int i = 0; i < npts; i++) {
73 is >> pos[i] >> slope[i] >> intercept[ << 61 is >> pos[i] >> slope[i] >> intercept[i];
74 if (fVerbosity) << 62 #ifdef debug
75 G4cout << tab << "Position " << i << << 63 G4cout << tab << "Position " << i << " " << pos[i] << " Slope "
76 << slope[i] << " Intercept " << 64 << slope[i] << " Intercept " << intercept[i] << G4endl;
>> 65 #endif
77 } 66 }
78 } 67 }
79 68
80 ////////////////////////////////////////// 69 ///////////////////////////////////////////////////////////////
81 // Close the file 70 // Close the file
82 G4cout << " ==> Closing file " << filename 71 G4cout << " ==> Closing file " << filename << G4endl;
83 is.close(); 72 is.close();
84 } 73 }
85 } 74 }
86 75
87 76
88 CCalMagneticField::~CCalMagneticField() { 77 CCalMagneticField::~CCalMagneticField() {
89 if (pos) 78 if (pos)
90 delete[] pos; 79 delete[] pos;
91 if (slope) 80 if (slope)
92 delete[] slope; 81 delete[] slope;
93 if (intercept) 82 if (intercept)
94 delete[] intercept; 83 delete[] intercept;
95 } 84 }
96 85
97 86
98 // Member functions 87 // Member functions
99 88
100 void CCalMagneticField::MagneticField(const G4 << 89 void CCalMagneticField::MagneticField(const double x[3], double B[3]) const {
101 { << 90
102 G4int i=0; 91 G4int i=0;
103 for (i=0; i<2; i++) { 92 for (i=0; i<2; i++) {
104 B[i] = 0*kilogauss; 93 B[i] = 0*kilogauss;
105 } 94 }
106 95
107 G4double m1=0; << 96 G4double m=0, c=0;
108 G4double c1=0; <<
109 G4double xnew = x[0]/mm + xoff; 97 G4double xnew = x[0]/mm + xoff;
110 if (npts > 0) { 98 if (npts > 0) {
111 for (i=0; i<npts; i++) { 99 for (i=0; i<npts; i++) {
112 if (xnew > pos[i]*mm) { 100 if (xnew > pos[i]*mm) {
113 m1 = slope[i]; << 101 m = slope[i];
114 c1 = intercept[i]; << 102 c = intercept[i];
115 } 103 }
116 } 104 }
117 } 105 }
118 G4double scor = c1 + m*xnew; << 106 G4double scor = c + m*xnew;
119 if (scor < 0.) scor = 0.; 107 if (scor < 0.) scor = 0.;
120 if (scor > 1.) scor = 1.0; 108 if (scor > 1.) scor = 1.0;
121 109
122 B[2] = scor*fval*kilogauss; 110 B[2] = scor*fval*kilogauss;
123 if (fVerbosity) << 111 #ifdef ddebug
124 { << 112 G4cout << "Field at x: " << x[0]/mm << "mm (" << xnew << ") = " << B[2]/tesla
125 << 113 << "T (m = " << m << ", c = " << c << ", scale = " << scor << ")"
126 G4cout << "Field at x: " << x[0]/mm << " << 114 << G4endl;
127 B[2]/tesla << 115 #endif
128 << "T (m = " << m1 << ", c = " << <<
129 c1 << ", scale = " << scor << ")" <<
130 << G4endl; <<
131 } <<
132 } 116 }
133 117
134 118
135 CLHEP::Hep3Vector CCalMagneticField:: << 119 Hep3Vector CCalMagneticField::MagneticField(const Hep3Vector point) const {
136 MagneticField(const CLHEP::Hep3Vector point) c <<
137 120
138 G4double x[3],B[3]; 121 G4double x[3],B[3];
139 CLHEP::Hep3Vector v; << 122 Hep3Vector v;
140 123
141 x[0] = point.x(); 124 x[0] = point.x();
142 x[1] = point.y(); 125 x[1] = point.y();
143 x[2] = point.z(); 126 x[2] = point.z();
144 CCalMagneticField::MagneticField(x, B); 127 CCalMagneticField::MagneticField(x, B);
145 v.setX(B[0]); 128 v.setX(B[0]);
146 v.setY(B[1]); 129 v.setY(B[1]);
147 v.setZ(B[2]); 130 v.setZ(B[2]);
148 return v; 131 return v;
149 } 132 }
150 133
151 134
152 void CCalMagneticField::GetFieldValue(const G4 << 135 void CCalMagneticField::GetFieldValue(const double x[3], double* B) const {
153 CCalMagneticField::MagneticField(x, B); 136 CCalMagneticField::MagneticField(x, B);
154 } 137 }
155 138
156 139