Geant4 10.7.0
Toolkit for the simulation of the passage of particles through matter
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G4ErrorFreeTrajState.hh
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1//
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25//
26//
27//
28// Class Description:
29//
30// Represents a free G4ErrorTrajState
31// It can be represented by the 5 variables
32// 1/p, lambda, phi, y_perp, z_perp
33// where lambda and phi are the dip and azimuthal angles related
34// to the momentum components in the following way:
35// p_x = p cos(lambda) cos(phi) ! lambda = 90 - theta
36// p_y = p cos(lambda) sin(phi)
37// p_z = p sin(lambda)
38// y_perp and z_perp are the coordinates of the trajectory in a
39// local orthonormal reference frame with the x_perp axis along the
40// particle direction, the y_perp being parallel to the x-y plane.
41//
42// This class also takes care of propagating the error associated to
43// the trajectory
44
45// History:
46// - Created: P. Arce
47// --------------------------------------------------------------------
48
49#ifndef G4ErrorFreeTrajState_hh
50#define G4ErrorFreeTrajState_hh
51
52#include "globals.hh"
53
54#include "G4ErrorMatrix.hh"
55
56#include "G4ErrorTrajState.hh"
58
59#include "G4Point3D.hh"
60#include "G4Vector3D.hh"
61
63
65{
66 public: // with description
67
68 G4ErrorFreeTrajState() : theFirstStep(true) {}
69 G4ErrorFreeTrajState( const G4String& partName,
70 const G4Point3D& pos,
71 const G4Vector3D& mom,
72 const G4ErrorTrajErr& errmat = G4ErrorTrajErr(5,0) );
73 // Constructor by providing particle, position and momentum
74
76 // Constructor by providing G4ErrorSurfaceTrajState
77
79
80 virtual G4int Update( const G4Track* aTrack );
81 // update parameters from G4Track
82
83 virtual G4int PropagateError( const G4Track* aTrack );
84 // propagate the error along the step
85
86 virtual void Dump( std::ostream& out = G4cout ) const;
87 // dump TrajState parameters
88
89 friend
90 std::ostream& operator<<(std::ostream&, const G4ErrorFreeTrajState& ts);
91
92 // Set and Get methods
93
94 virtual void SetPosition( const G4Point3D pos )
95 { SetParameters( pos, fMomentum ); }
96
97 virtual void SetMomentum( const G4Vector3D& mom )
98 { SetParameters( fPosition, mom ); }
99
100 void SetParameters( const G4Point3D& pos, const G4Vector3D& mom )
101 {
102 fPosition = pos;
103 fMomentum = mom;
104 fTrajParam.SetParameters( pos, mom );
105 }
106
108 { return fTrajParam; }
109
111 { return theTransfMat; }
112
113 private:
114
115 void Init();
116 // define TrajState type and build charge
117
118 G4int PropagateErrorMSC( const G4Track* aTrack );
119 // add the error associated to multiple scattering
120
121 void CalculateEffectiveZandA( const G4Material* mate, double& effZ, double& effA );
122 // calculate effective Z and A (needed by PropagateErrorMSC)
123
124 G4int PropagateErrorIoni( const G4Track* aTrack );
125 // add the error associated to ionization energy loss
126
127
128 private:
129
130 G4ErrorFreeTrajParam fTrajParam;
131
132 G4ErrorMatrix theTransfMat;
133
134 G4bool theFirstStep; // to count if transf mat is updated or initialized
135};
136
137#endif
G4ErrorSymMatrix G4ErrorTrajErr
bool G4bool
Definition: G4Types.hh:86
int G4int
Definition: G4Types.hh:85
G4GLOB_DLL std::ostream G4cout
void SetParameters(const G4Point3D &pos, const G4Vector3D &mom)
virtual G4int Update(const G4Track *aTrack)
void SetParameters(const G4Point3D &pos, const G4Vector3D &mom)
G4ErrorMatrix GetTransfMat() const
virtual void SetMomentum(const G4Vector3D &mom)
virtual G4int PropagateError(const G4Track *aTrack)
G4ErrorFreeTrajParam GetParameters() const
virtual void SetPosition(const G4Point3D pos)
virtual void Dump(std::ostream &out=G4cout) const
friend std::ostream & operator<<(std::ostream &, const G4ErrorFreeTrajState &ts)