Gabriele Cosmo
138 lines
4.7 KiB
C++
138 lines
4.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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//
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// Class Description:
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//
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// Represents a free G4ErrorTrajState
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// It can be represented by the 5 variables
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// 1/p, lambda, phi, y_perp, z_perp
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// where lambda and phi are the dip and azimuthal angles related
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// to the momentum components in the following way:
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// p_x = p cos(lambda) cos(phi) ! lambda = 90 - theta
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// p_y = p cos(lambda) sin(phi)
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// p_z = p sin(lambda)
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// y_perp and z_perp are the coordinates of the trajectory in a
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// local orthonormal reference frame with the x_perp axis along the
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// particle direction, the y_perp being parallel to the x-y plane.
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//
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// This class also takes care of propagating the error associated to
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// the trajectory
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// History:
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// - Created: P. Arce
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// --------------------------------------------------------------------
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#ifndef G4ErrorFreeTrajState_hh
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#define G4ErrorFreeTrajState_hh
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#include "globals.hh"
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#include "G4ErrorMatrix.hh"
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#include "G4ErrorTrajState.hh"
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#include "G4ErrorFreeTrajParam.hh"
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#include "G4Point3D.hh"
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#include "G4Vector3D.hh"
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class G4ErrorSurfaceTrajState;
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class G4ErrorFreeTrajState : public G4ErrorTrajState
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{
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public: // with description
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G4ErrorFreeTrajState()
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: theFirstStep(true)
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{}
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G4ErrorFreeTrajState(const G4String& partName, const G4Point3D& pos,
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const G4Vector3D& mom,
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const G4ErrorTrajErr& errmat = G4ErrorTrajErr(5, 0));
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// Constructor by providing particle, position and momentum
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G4ErrorFreeTrajState(const G4ErrorSurfaceTrajState& tpOS);
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// Constructor by providing G4ErrorSurfaceTrajState
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~G4ErrorFreeTrajState() {}
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virtual G4int Update(const G4Track* aTrack);
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// update parameters from G4Track
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virtual G4int PropagateError(const G4Track* aTrack);
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// propagate the error along the step
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virtual void Dump(std::ostream& out = G4cout) const;
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// dump TrajState parameters
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friend std::ostream& operator<<(std::ostream&,
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const G4ErrorFreeTrajState& ts);
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// Set and Get methods
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virtual void SetPosition(const G4Point3D pos)
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{
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SetParameters(pos, fMomentum);
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}
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virtual void SetMomentum(const G4Vector3D& mom)
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{
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SetParameters(fPosition, mom);
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}
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void SetParameters(const G4Point3D& pos, const G4Vector3D& mom)
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{
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fPosition = pos;
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fMomentum = mom;
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fTrajParam.SetParameters(pos, mom);
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}
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G4ErrorFreeTrajParam GetParameters() const { return fTrajParam; }
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G4ErrorMatrix GetTransfMat() const { return theTransfMat; }
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private:
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void Init();
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// define TrajState type and build charge
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G4int PropagateErrorMSC(const G4Track* aTrack);
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// add the error associated to multiple scattering
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void CalculateEffectiveZandA(const G4Material* mate, double& effZ,
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double& effA);
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// calculate effective Z and A (needed by PropagateErrorMSC)
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G4int PropagateErrorIoni(const G4Track* aTrack);
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// add the error associated to ionization energy loss
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private:
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G4ErrorFreeTrajParam fTrajParam;
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G4ErrorMatrix theTransfMat;
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G4bool theFirstStep; // to count if transf mat is updated or initialized
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};
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#endif
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