Gabriele Cosmo
103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
//
|
|
// ********************************************************************
|
|
// * DISCLAIMER *
|
|
// * *
|
|
// * The following disclaimer summarizes all the specific disclaimers *
|
|
// * of contributors to this software. The specific disclaimers,which *
|
|
// * govern, are listed with their locations in: *
|
|
// * http://cern.ch/geant4/license *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. *
|
|
// * *
|
|
// * This code implementation is the intellectual property of the *
|
|
// * GEANT4 collaboration. *
|
|
// * By copying, distributing or modifying the Program (or any work *
|
|
// * based on the Program) you indicate your acceptance of this *
|
|
// * statement, and all its terms. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// $Id: G4RKG3_Stepper.hh,v 1.8 2001/07/11 09:59:09 gunter Exp $
|
|
// GEANT4 tag $Name: geant4-05-00 $
|
|
//
|
|
//
|
|
// class G4RKG3_Stepper
|
|
//
|
|
// Class description:
|
|
//
|
|
// Integrator Runga-Kutta Stepper from Geant3.
|
|
|
|
// History:
|
|
// - Created. J.Apostolakis, V.Grichine - 30.01.97
|
|
|
|
#ifndef G4RKG3_Stepper_hh
|
|
#define G4RKG3_Stepper_hh
|
|
|
|
#include "G4MagIntegratorStepper.hh"
|
|
#include "G4ThreeVector.hh"
|
|
#include "G4Mag_EqRhs.hh"
|
|
|
|
class G4RKG3_Stepper : public G4MagIntegratorStepper
|
|
{
|
|
public: // with description
|
|
|
|
G4RKG3_Stepper(G4Mag_EqRhs *EqRhs)
|
|
: G4MagIntegratorStepper(EqRhs,6){ G4Exception(" G4RKG3_Stepper: is not available in the current version.");}
|
|
// Integrate over 6 variables only: position & velocity.
|
|
|
|
~G4RKG3_Stepper(){;}
|
|
|
|
void Stepper( const G4double yIn[],
|
|
const G4double dydx[],
|
|
G4double h,
|
|
G4double yOut[],
|
|
G4double yErr[] );
|
|
// The method which must be provided, even if less efficient.
|
|
|
|
G4double DistChord() const ;
|
|
|
|
void StepNoErr( const G4double tIn[7],
|
|
const G4double dydx[7],
|
|
G4double Step,
|
|
G4double tOut[7],
|
|
G4double B[3] );
|
|
// Integrator RK Stepper from G3 with only two field evaluation per
|
|
// Step. It is used in propagation initial Step by small substeps
|
|
// after solution error and delta geometry considerations.
|
|
// B[3] is magnetic field which is passed from substep to substep.
|
|
|
|
void StepWithEst( const G4double tIn[7],
|
|
const G4double dydx[7],
|
|
G4double Step,
|
|
G4double tOut[7],
|
|
G4double& alpha2, // to delete ?
|
|
G4double& beta2,
|
|
const G4double B1[3],
|
|
G4double B2[3] );
|
|
// Integrator for RK from G3 with evaluation of error in solution and delta
|
|
// geometry based on naive similarity with the case of uniform magnetic field.
|
|
// B1[3] is input and is the first magnetic field values
|
|
// B2[3] is output and is the final magnetic field values.
|
|
|
|
public: // without description
|
|
|
|
G4int IntegratorOrder() const { return 4; }
|
|
|
|
protected:
|
|
// void Field( const G4double Point[3],
|
|
// G4double Bfield[3] ) const
|
|
// { EqRhs-> GetFieldValue( Point, Bfield ) ; }
|
|
|
|
private:
|
|
|
|
G4ThreeVector fyInitial,
|
|
fyMidPoint,
|
|
fyFinal ;
|
|
};
|
|
|
|
#endif
|