| 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 | // $Id: G4FieldTrack.hh,v 1.21 2006/11/13 18:24:35 gcosmo Exp $
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| 28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $
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| 29 | //
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| 30 | //
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| 31 | // class G4FieldTrack
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| 32 | //
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| 33 | // Class description:
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| 34 | //
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| 35 | // Data structure bringing together a magnetic track's state.
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| 36 | // (position, momentum direction & modulus, energy, spin, ... )
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| 37 | // Uses/abilities:
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| 38 | // - does not maintain any relationship between its data (eg energy/momentum).
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| 39 | // - for use in Runge-Kutta solver (in passing it the values right now).
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| 40 |
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| 41 | // History
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| 42 | // - First version: Oct 14, 1996 John Apostolakis
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| 43 | // - Modified: Oct 24, 1996 JA: Added dist_on_curve, deleted constructor
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| 44 | // Nov 5, 1998 JA: Added energy, momentum, TOF, spin &
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| 45 | // several constructor, access, set methods
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| 46 | // May 10, 2006 JA: Added charge, "default" constructor
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| 47 | // -------------------------------------------------------------------
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| 48 |
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| 49 | #ifndef G4FieldTrack_HH
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| 50 | #define G4FieldTrack_HH
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| 51 |
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| 52 | #include "G4ThreeVector.hh"
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| 53 |
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| 54 | class G4FieldTrack
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| 55 | {
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| 56 | public: // with description
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| 57 |
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| 58 | G4FieldTrack( const G4ThreeVector& pPosition,
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| 59 | G4double LaboratoryTimeOfFlight,
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| 60 | const G4ThreeVector& pMomentumDirection,
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| 61 | G4double kineticEnergy,
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| 62 | G4double restMass_c2,
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| 63 | G4double charge,
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| 64 | const G4ThreeVector& pSpin,
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| 65 | G4double magnetic_dipole_moment= 0.0,
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| 66 | G4double curve_length= 0.0
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| 67 | );
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| 68 | G4FieldTrack( const G4FieldTrack& pFieldTrack );
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| 69 | G4FieldTrack( char ); // Almost default constructor
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| 70 |
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| 71 | ~G4FieldTrack();
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| 72 | // End of preferred Constructors / Destructor
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| 73 |
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| 74 | inline void
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| 75 | UpdateState( const G4ThreeVector& pPosition,
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| 76 | G4double LaboratoryTimeOfFlight,
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| 77 | const G4ThreeVector& pMomentumDirection,
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| 78 | G4double kineticEnergy);
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| 79 | // Update four-vectors for space/time and momentum/energy
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| 80 | // Also resets curve length.
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| 81 | inline
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| 82 | void UpdateFourMomentum( G4double kineticEnergy,
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| 83 | const G4ThreeVector& momentumDirection );
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| 84 | // Update momentum (and direction), and kinetic energy
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| 85 |
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| 86 | void SetChargeAndMoments(G4double charge,
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| 87 | G4double magnetic_dipole_moment= DBL_MAX,
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| 88 | G4double electric_dipole_moment= DBL_MAX,
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| 89 | G4double magnetic_charge=DBL_MAX );
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| 90 | // Sets all charges and moments
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| 91 |
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| 92 | G4FieldTrack( const G4ThreeVector& pPosition,
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| 93 | const G4ThreeVector& pMomentumDirection,
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| 94 | G4double curve_length,
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| 95 | G4double kineticEnergy,
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| 96 | const G4double restMass_c2,
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| 97 | G4double velocity,
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| 98 | G4double LaboratoryTimeOfFlight=0.0,
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| 99 | G4double ProperTimeOfFlight=0.0,
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| 100 | const G4ThreeVector* pSpin=0);
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| 101 | // Older constructor
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| 102 | // ---> Misses charge !!!
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| 103 |
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| 104 | inline G4FieldTrack& operator = ( const G4FieldTrack & rStVec );
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| 105 | // Assignment operator
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| 106 |
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| 107 | inline G4ThreeVector GetMomentum() const;
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| 108 | inline G4ThreeVector GetPosition() const;
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| 109 | inline const G4ThreeVector& GetMomentumDir() const;
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| 110 | inline G4ThreeVector GetMomentumDirection() const;
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| 111 | inline G4double GetCurveLength() const;
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| 112 | // Distance along curve of point.
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| 113 |
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| 114 | inline G4ThreeVector GetSpin() const;
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| 115 | inline G4double GetLabTimeOfFlight() const;
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| 116 | inline G4double GetProperTimeOfFlight() const;
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| 117 | inline G4double GetKineticEnergy() const;
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| 118 | inline G4double GetCharge() const;
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| 119 | // Accessors.
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| 120 |
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| 121 | inline void SetPosition(G4ThreeVector nPos);
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| 122 | inline void SetMomentum(G4ThreeVector nMomDir);
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| 123 | // Does change mom-dir too.
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| 124 |
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| 125 | inline void SetMomentumDir(G4ThreeVector nMomDir);
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| 126 | // Does NOT change Momentum or Velocity Vector.
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| 127 |
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| 128 | inline void SetCurveLength(G4double nCurve_s);
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| 129 | // Distance along curve.
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| 130 | inline void SetKineticEnergy(G4double nEnergy);
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| 131 | // Does not modify momentum.
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| 132 |
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| 133 | inline void SetSpin(G4ThreeVector nSpin);
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| 134 | inline void SetLabTimeOfFlight(G4double nTOF);
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| 135 | inline void SetProperTimeOfFlight(G4double nTOF);
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| 136 | // Modifiers
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| 137 |
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| 138 | public: // without description
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| 139 |
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| 140 | inline G4FieldTrack& SetCurvePnt(const G4ThreeVector& pPosition,
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| 141 | const G4ThreeVector& pMomentum,
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| 142 | G4double s_curve );
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| 143 | inline void InitialiseSpin( const G4ThreeVector& Spin );
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| 144 | // Used to update / initialise the state
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| 145 |
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| 146 | enum { ncompSVEC = 12 };
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| 147 | // Needed and should be used only for RK integration driver
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| 148 |
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| 149 | inline void DumpToArray(G4double valArr[ncompSVEC]) const;
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| 150 | inline void LoadFromArray(const G4double valArr[ncompSVEC],
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| 151 | G4int noVarsIntegrated);
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| 152 | friend std::ostream&
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| 153 | operator<<( std::ostream& os, const G4FieldTrack& SixVec);
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| 154 |
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| 155 | private:
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| 156 |
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| 157 | G4double SixVector[6];
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| 158 | G4double fDistanceAlongCurve; // distance along curve of point
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| 159 | G4double fKineticEnergy;
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| 160 | G4double fRestMass_c2;
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| 161 | G4double fLabTimeOfFlight;
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| 162 | G4double fProperTimeOfFlight;
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| 163 | G4ThreeVector fSpin;
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| 164 | G4ThreeVector fMomentumDir;
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| 165 |
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| 166 | private: // Implementation detail -- daughter class
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| 167 |
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| 168 | class G4ChargeState // Charge & moments
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| 169 | {
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| 170 | public: // without description
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| 171 |
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| 172 | inline G4ChargeState(G4double charge,
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| 173 | G4double magnetic_dipole_moment= 0.0,
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| 174 | G4double electric_dipole_moment= 0.0,
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| 175 | G4double magnetic_charge= 0.0);
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| 176 | inline G4ChargeState( const G4ChargeState& right );
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| 177 |
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| 178 | inline void SetCharge(G4double charge){ fCharge= charge; }
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| 179 |
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| 180 | // Revise the charge (in units of the positron charge)
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| 181 | // do not change moments
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| 182 |
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| 183 | void SetChargeAndMoments(G4double charge,
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| 184 | G4double magnetic_dipole_moment= DBL_MAX,
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| 185 | G4double electric_dipole_moment= DBL_MAX,
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| 186 | G4double magnetic_charge=DBL_MAX );
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| 187 | // Revise the charge and all moments
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| 188 |
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| 189 | G4double GetCharge() const { return fCharge; }
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| 190 | G4double GetMagneticDipoleMoment() const { return fMagn_dipole; }
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| 191 | G4double ElectricDipoleMoment() const { return fElec_dipole; }
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| 192 | G4double MagneticCharge() const { return fMagneticCharge; }
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| 193 |
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| 194 | private:
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| 195 |
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| 196 | G4double fCharge;
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| 197 | G4double fMagn_dipole;
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| 198 | G4double fElec_dipole;
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| 199 | G4double fMagneticCharge; // for magnetic monopole
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| 200 | };
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| 201 |
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| 202 | G4ChargeState fChargeState;
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| 203 |
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| 204 | public: // Access
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| 205 |
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| 206 | const G4ChargeState* GetChargeState() const { return &fChargeState; }
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| 207 | };
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| 208 |
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| 209 | #include "G4FieldTrack.icc"
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| 210 |
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| 211 | #endif /* End of ifndef G4FieldTrack_HH */
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