Gabriele Cosmo
111 lines
3.9 KiB
C++
111 lines
3.9 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4MagHelicalStepper.hh,v 1.7 2001/07/11 09:59:08 gunter Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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//
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// class G4MagHelicalStepper
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//
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// Class description:
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//
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// Abstract base class for integrator of particle's equation of motion,
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// used in tracking in space dependent magnetic field
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// History:
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// - 05.11.98 J.Apostolakis Creation of new ABC
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#ifndef G4MagHelicalStepper_hh
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#define G4MagHelicalStepper_hh
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#include "globals.hh"
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#include "G4MagIntegratorStepper.hh"
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#include "G4Mag_EqRhs.hh"
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#include "G4ThreeVector.hh"
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class G4MagHelicalStepper : public G4MagIntegratorStepper
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{
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public: // with description
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G4MagHelicalStepper(G4Mag_EqRhs *EqRhs);
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virtual ~G4MagHelicalStepper();
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void Stepper( const G4double y[],
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const G4double dydx[],
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G4double h,
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G4double yout[],
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G4double yerr[] );
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// The stepper for the Runge Kutta integration.
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// The stepsize is fixed, equal to h.
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// Integrates ODE starting values y[0 to 6]
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// Outputs yout[] and its estimated error yerr[].
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virtual void DumbStepper( const G4double y[],
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G4ThreeVector Bfld,
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G4double h,
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G4double yout[] ) = 0;
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// Performs a 'dump' Step without error calculation.
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G4double DistChord() const;
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// Estimate maximum distance of curved solution and chord ...
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protected: // with description
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inline void LinearStep( const G4double yIn[],
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G4double h,
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G4double yHelix[]);
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// A linear Step in regions without magnetic field.
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void AdvanceHelix( const G4double yIn[],
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G4ThreeVector Bfld,
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G4double h,
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G4double yHelix[]); // output
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// A first order Step along a helix inside the field.
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inline void MagFieldEvaluate( const G4double y[], G4ThreeVector& Bfield );
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// Evaluate the field at a certain point.
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protected: // without description
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// void MagFieldEvaluate( const G4double y[], G4double B[] )
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// { GetEquationOfMotion()-> GetFieldValue(y, B); }
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private:
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G4MagHelicalStepper(const G4MagHelicalStepper&);
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G4MagHelicalStepper& operator=(const G4MagHelicalStepper&);
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// Private copy constructor and assignment operator.
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static const G4double fUnitConstant; // As in G4Mag_EqRhs.hh/cc where it is not used.
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private:
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G4ThreeVector yInitial, yMidPoint, yFinal;
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// Data stored in order to find the chord.
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G4Mag_EqRhs* fPtrMagEqOfMot;
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};
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#include "G4MagHelicalStepper.icc"
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#endif /* G4MagHelicalStepper_hh */
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