BDSFieldMagMultipoleOuter.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 BDSFIELDMAGMULTIPOLEOUTER_H
#define BDSFIELDMAGMULTIPOLEOUTER_H
 
#include "BDSFieldMag.hh"
 
#include "globals.hh" // geant4 types / globals
#include "G4RotationMatrix.hh"
#include "G4ThreeVector.hh"
#include "G4TwoVector.hh"
 
#include <vector>
 
class BDSMagnetStrength;
 
class BDSFieldMagMultipoleOuter: public BDSFieldMag
{
public:
  BDSFieldMagMultipoleOuter(G4int              orderIn,  // order must be > 0
                            G4double           poleTipRadius,
                            const BDSFieldMag* innerFieldIn,
                            G4bool             kPositive,
                            G4double           bRho,
                            G4double           arbitraryScaling = 1.0);
 
  virtual ~BDSFieldMagMultipoleOuter(){;}
 
  virtual G4ThreeVector GetField(const G4ThreeVector& position,
                                 const double         t = 0) const;
 
private:
  const G4int       order;           
  G4double          phiOffset;       
  G4double          spatialLimit;    
  G4double          normalisation;   
  G4bool            positiveField;   
  G4int             poleNOffset;     
  G4double          poleTipRadius;   
  std::vector<G4TwoVector> currents; 
  G4double          maxField;        
  G4bool            initialisationPhase; 
};
 
#endif