1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | /////////////////////////////////////////////////////////////////////////////// |
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27 | // File: CCalMagneticField.cc |
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28 | // Description: User Field class implementation. |
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29 | /////////////////////////////////////////////////////////////////////////////// |
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30 | #include "CCalMagneticField.hh" |
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31 | #include "CCalutils.hh" |
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32 | #include "G4FieldManager.hh" |
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33 | #include <fstream> |
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34 | |
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35 | //#define ddebug |
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36 | //#define debug |
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37 | |
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38 | //Constructor and destructor: |
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39 | |
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40 | CCalMagneticField::CCalMagneticField(const G4String &filename) : |
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41 | fval(0), pos(0), slope(0), intercept(0) { |
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42 | |
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43 | //Let's open the file |
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44 | G4cout << " ==> Opening file " << filename << " to read magnetic field..." |
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45 | << G4endl; |
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46 | G4String pathName = getenv("CCAL_GLOBALPATH"); |
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47 | std::ifstream is; |
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48 | bool ok = openGeomFile(is, pathName, filename); |
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49 | |
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50 | if (ok) { |
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51 | findDO(is, G4String("FLDM")); |
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52 | is >> fval >> npts >> xoff; |
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53 | #ifdef debug |
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54 | G4cout << "Field value " << fval << " # points " << npts << " offset in x " |
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55 | << xoff*mm << G4endl; |
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56 | #endif |
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57 | |
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58 | if (npts > 0) { |
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59 | pos = new G4double[npts]; |
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60 | slope = new G4double[npts]; |
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61 | intercept = new G4double[npts]; |
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62 | |
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63 | for (G4int i = 0; i < npts; i++) { |
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64 | is >> pos[i] >> slope[i] >> intercept[i]; |
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65 | #ifdef debug |
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66 | G4cout << tab << "Position " << i << " " << pos[i] << " Slope " |
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67 | << slope[i] << " Intercept " << intercept[i] << G4endl; |
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68 | #endif |
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69 | } |
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70 | } |
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71 | |
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72 | /////////////////////////////////////////////////////////////// |
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73 | // Close the file |
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74 | G4cout << " ==> Closing file " << filename << G4endl; |
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75 | is.close(); |
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76 | } |
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77 | } |
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78 | |
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79 | |
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80 | CCalMagneticField::~CCalMagneticField() { |
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81 | if (pos) |
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82 | delete[] pos; |
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83 | if (slope) |
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84 | delete[] slope; |
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85 | if (intercept) |
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86 | delete[] intercept; |
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87 | } |
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88 | |
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89 | |
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90 | // Member functions |
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91 | |
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92 | void CCalMagneticField::MagneticField(const double x[3], double B[3]) const { |
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93 | |
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94 | G4int i=0; |
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95 | for (i=0; i<2; i++) { |
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96 | B[i] = 0*kilogauss; |
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97 | } |
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98 | |
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99 | G4double m=0, c=0; |
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100 | G4double xnew = x[0]/mm + xoff; |
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101 | if (npts > 0) { |
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102 | for (i=0; i<npts; i++) { |
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103 | if (xnew > pos[i]*mm) { |
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104 | m = slope[i]; |
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105 | c = intercept[i]; |
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106 | } |
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107 | } |
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108 | } |
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109 | G4double scor = c + m*xnew; |
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110 | if (scor < 0.) scor = 0.; |
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111 | if (scor > 1.) scor = 1.0; |
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112 | |
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113 | B[2] = scor*fval*kilogauss; |
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114 | #ifdef ddebug |
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115 | G4cout << "Field at x: " << x[0]/mm << "mm (" << xnew << ") = " << B[2]/tesla |
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116 | << "T (m = " << m << ", c = " << c << ", scale = " << scor << ")" |
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117 | << G4endl; |
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118 | #endif |
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119 | } |
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120 | |
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121 | |
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122 | CLHEP::Hep3Vector CCalMagneticField:: |
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123 | MagneticField(const CLHEP::Hep3Vector point) const { |
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124 | |
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125 | G4double x[3],B[3]; |
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126 | CLHEP::Hep3Vector v; |
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127 | |
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128 | x[0] = point.x(); |
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129 | x[1] = point.y(); |
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130 | x[2] = point.z(); |
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131 | CCalMagneticField::MagneticField(x, B); |
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132 | v.setX(B[0]); |
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133 | v.setY(B[1]); |
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134 | v.setZ(B[2]); |
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135 | return v; |
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136 | } |
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137 | |
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138 | |
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139 | void CCalMagneticField::GetFieldValue(const double x[3], double* B) const { |
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140 | CCalMagneticField::MagneticField(x, B); |
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141 | } |
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142 | |
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