BDSFieldEMRFCavity.hh

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) Royal Holloway, 
University of London 2001 - 2024.
 
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 BDSFIELDEMRFCAVITY_H
#define BDSFIELDEMRFCAVITY_H
 
#include "BDSFieldEM.hh"
 
#include "globals.hh"
#include "G4ThreeVector.hh"
 
#include <utility>
 
class BDSCavityInfo;
class BDSMagnetStrength;
 
class BDSFieldEMRFCavity: public BDSFieldEM
{
public:
  BDSFieldEMRFCavity() = delete;
  explicit BDSFieldEMRFCavity(BDSMagnetStrength const* strength);
  
  BDSFieldEMRFCavity(G4double eFieldAmplitude,
                     G4double frequency,
                     G4double phaseOffset,
                     G4double cavityRadius,
                     G4double synchronousTIn);
  
  virtual ~BDSFieldEMRFCavity(){;}
 
  virtual std::pair<G4ThreeVector, G4ThreeVector> GetField(const G4ThreeVector& position,
                                                           const G4double       t) const;
  
  virtual G4bool TimeVarying() const {return true;}
  
  static G4double TransitTimeFactor(G4double frequency,
                                    G4double phase,
                                    G4double zLength,
                                    G4double beta);
  
private:
  G4double eFieldMax;    
  G4double phase;        
  G4double cavityRadius; 
  G4double synchronousT;
 
  static const G4double j0FirstZero; 
  static const G4double Z0; 
  const G4double normalisedCavityRadius; 
  const G4double angularFrequency; 
};
 
#endif