BesMagneticField.hh

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// $Id: BesMagneticField.hh,v 1.5 2015/03/17 05:50:57 sunss Exp $
// GEANT4 tag $Name: BesSim-00-01-30 $
//
//
//    A class for control of the Magnetic Field of the detector.
//  The field is assumed to be uniform.
//
//  $ Id:  $
 
// Should this be a:
//    i) messenger
//   ii) user class that creates the field       ?
//  iii) simply a derived class of Uniform field ?  <== I have chosen this now.
//   iv) a field manager that creates/updates field    (Prefered?)
//
 
#ifndef BesMagneticField_H
#define BesMagneticField_H
 
#include "G4MagneticField.hh"
#include "MagneticFieldSvc/IBesMagFieldSvc.h"
#include "globals.hh"
 
using namespace std;
 
class G4FieldManager;
class G4ChordFinder;
class G4Mag_UsualEqRhs;
class G4MagIntegratorStepper;
class BesMagneticFieldMessenger;
 
class BesMagneticField : public G4MagneticField {
public:
  BesMagneticField(); //  A zero field
 
  ~BesMagneticField();
  void GetFieldValue( const double Point[3], double* Bfield ) const;
 
  void SetStepperType( G4int i ) { fStepperType = i; }
 
  void SetStepper();
 
  void SetMinStep( G4double s ) { fMinStep = s; }
 
  void InitialiseAll(); //  Set parameters and call method below
  void CreateStepperAndChordFinder();
 
  void SetDeltaOneStep( double newvalue );
  void SetDeltaIntersection( double newvalue );
  void SetMinimumEpsilonStep( double newvalue );
  void SetMaximumEpsilonStep( double newvalue );
 
protected:
  G4FieldManager*   fFieldManager;
  G4ChordFinder*    fChordFinder;
  G4Mag_UsualEqRhs* fEquation;
 
  G4MagIntegratorStepper* fStepper;
  G4int                   fStepperType;
 
  G4double fMinStep;
 
  BesMagneticFieldMessenger* fFieldMessenger;
  IBesMagFieldSvc*           m_pIMF;
};
 
#endif