BDSIntegratorDipoleRodrigues2.hh

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) Royal Holloway, 
University of London 2001 - 2022.
 
This file is part of BDSIM.
 
BDSIM is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published 
by the Free Software Foundation version 3 of the License.
 
BDSIM is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with BDSIM.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef BDSINTEGRATORDIPOLERODRIGUES2_H
#define BDSINTEGRATORDIPOLERODRIGUES2_H
 
#include "BDSIntegratorDrift.hh"
#include "BDSMagnetStrength.hh"
 
#include "globals.hh"
#include "G4MagHelicalStepper.hh"
#include "G4ThreeVector.hh"
 
class G4MagIntegratorStepper;
class G4Mag_EqRhs;
 
class BDSIntegratorDipoleRodrigues2: public G4MagHelicalStepper, public BDSIntegratorDrift
{
public:
  BDSIntegratorDipoleRodrigues2(G4Mag_EqRhs* eqOfMIn,
                                G4double     minimumRadiusOfCurvature);
 
  virtual ~BDSIntegratorDipoleRodrigues2(){;}
 
  virtual void DumbStepper(const G4double yIn[6],
                           G4ThreeVector  field,
                           G4double       stepLength,
                           G4double       yOut[6]);
 
  void SingleStep(const G4double  yIn[6],
                  const G4double& h,
                  G4double        yOut[6]);
 
  virtual void Stepper(const G4double  yIn[6],   
                       const G4double  dydx[],   
                       G4double        h,        
                       G4double        yOut[6],  
                       G4double        yErr[6]); 
 
  virtual G4int IntegratorOrder() const {return 1;}
 
  void AdvanceHelixForSpiralling(const G4double       yIn[6],
                                 const G4ThreeVector& field,
                                 const G4double&      h,
                                 G4double             yOut[6],
                                 G4double             yErr[6]);
 
  inline G4double RadiusOfHelix() const {return GetRadHelix();}
 
protected:
  void FudgeDistChordToZero();
 
  G4Mag_EqRhs* eqOfM;
 
private:
  BDSIntegratorDipoleRodrigues2() = delete;
 
  G4double minimumRadiusOfCurvature;
 
};
 
#endif