1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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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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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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 | // |
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28 | // $Id: G4MagHelicalStepper.hh,v 1.15 2007/08/21 08:48:28 tnikitin Exp $ |
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29 | // GEANT4 tag $Name: $ |
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30 | // |
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31 | // |
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32 | // |
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33 | // class G4MagHelicalStepper |
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34 | // |
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35 | // Class description: |
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36 | // |
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37 | // Abstract base class for integrator of particle's equation of motion, |
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38 | // used in tracking in space dependent magnetic field |
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39 | |
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40 | // History: |
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41 | // - 05.11.98 J.Apostolakis Creation of new ABC |
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42 | // -------------------------------------------------------------------- |
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43 | |
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44 | #ifndef G4MagHelicalStepper_hh |
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45 | #define G4MagHelicalStepper_hh |
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46 | |
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47 | #include "G4Types.hh" |
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48 | #include "G4MagIntegratorStepper.hh" |
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49 | #include "G4Mag_EqRhs.hh" |
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50 | #include "G4ThreeVector.hh" |
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51 | |
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52 | class G4MagHelicalStepper : public G4MagIntegratorStepper |
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53 | { |
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54 | public: // with description |
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55 | |
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56 | G4MagHelicalStepper(G4Mag_EqRhs *EqRhs); |
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57 | virtual ~G4MagHelicalStepper(); |
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58 | |
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59 | virtual void Stepper( const G4double y[], // VIRTUAL for ExactHelix - temporary |
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60 | const G4double dydx[], |
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61 | G4double h, |
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62 | G4double yout[], |
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63 | G4double yerr[] ); |
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64 | // The stepper for the Runge Kutta integration. |
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65 | // The stepsize is fixed, equal to h. |
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66 | // Integrates ODE starting values y[0 to 6] |
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67 | // Outputs yout[] and its estimated error yerr[]. |
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68 | |
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69 | virtual void DumbStepper( const G4double y[], |
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70 | G4ThreeVector Bfld, |
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71 | G4double h, |
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72 | G4double yout[] ) = 0; |
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73 | // Performs a 'dump' Step without error calculation. |
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74 | |
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75 | G4double DistChord()const ; |
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76 | // Estimate maximum distance of curved solution and chord ... |
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77 | |
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78 | protected: // with description |
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79 | |
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80 | inline void LinearStep( const G4double yIn[], |
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81 | G4double h, |
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82 | G4double yHelix[]) const; |
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83 | // A linear Step in regions without magnetic field. |
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84 | |
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85 | void AdvanceHelix( const G4double yIn[], |
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86 | G4ThreeVector Bfld, |
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87 | G4double h, |
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88 | G4double yHelix[],G4double yHelix2[]=0); // output |
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89 | // A first order Step along a helix inside the field. |
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90 | |
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91 | inline void MagFieldEvaluate( const G4double y[], G4ThreeVector& Bfield ); |
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92 | // Evaluate the field at a certain point. |
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93 | |
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94 | |
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95 | inline G4double GetInverseCurve( const G4double Momentum, const G4double Bmag ); |
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96 | // Evaluate Inverse of Curvature of Track |
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97 | |
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98 | // Store and use the parameters of track : |
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99 | // Radius of curve, Stepping angle, Radius of projected helix |
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100 | inline void SetAngCurve(const G4double Ang); |
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101 | inline G4double GetAngCurve()const; |
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102 | |
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103 | inline void SetCurve(const G4double Curve); |
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104 | inline G4double GetCurve()const; |
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105 | |
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106 | inline void SetRadHelix(const G4double Rad); |
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107 | inline G4double GetRadHelix()const; |
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108 | |
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109 | |
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110 | protected: // without description |
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111 | |
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112 | // void MagFieldEvaluate( const G4double y[], G4double B[] ) |
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113 | // { GetEquationOfMotion()-> GetFieldValue(y, B); } |
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114 | |
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115 | private: |
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116 | |
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117 | G4MagHelicalStepper(const G4MagHelicalStepper&); |
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118 | G4MagHelicalStepper& operator=(const G4MagHelicalStepper&); |
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119 | // Private copy constructor and assignment operator. |
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120 | |
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121 | static const G4double fUnitConstant; // As in G4Mag_EqRhs.hh/cc where it is not used. |
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122 | private: |
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123 | |
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124 | G4Mag_EqRhs* fPtrMagEqOfMot; |
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125 | |
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126 | // Data stored in order to find the chord. |
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127 | G4double fAngCurve; |
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128 | G4double frCurve; |
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129 | G4double frHelix; |
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130 | // Data stored in order to find the chord. |
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131 | G4ThreeVector yInitial, yMidPoint, yFinal; |
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132 | |
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133 | |
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134 | }; |
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135 | |
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136 | #include "G4MagHelicalStepper.icc" |
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137 | |
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138 | #endif /* G4MagHelicalStepper_hh */ |
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