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//             LOW ENERGY MUON SPIN RELAXATION, ROTATION, RADIATION 
// 
//  ID    :LEMuSRCryoField.hh , v 1.2
//  AUTHOR: Taofiq PARAISO
//  DATE  : 2006-01-19 15:17
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//
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//  &&&&&&&&&&  &&&&&&&&&&      &  &&&&&    &&    &&&&&&&       &        &&   
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//                         &  
//                               CRYOFIELD   
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#include "G4ElectricField.hh"
#include "G4ThreeVector.hh"
#include "G4ios.hh"
/*!
 * This class is defines homogenous electric field in the cryostat region.
 * It is obsolete since a field map has been introduces for this region.
 * Should be removed in the future.
 */

class LEMuSRCryoField : public G4ElectricField
{
public: 

  /*! This constructor initializes the field for all the sample chamber
   */
  LEMuSRCryoField(G4ThreeVector FieldVector);
  /*! The constructor initializes the field within the boundary cylinder centered in mcpv_z, radius and length= zmax-zmin
   */

  LEMuSRCryoField(G4ThreeVector FieldVector,G4double radius,G4double zmin, G4double zmax);
  ~LEMuSRCryoField();

  G4bool   DoesFieldChangeEnergy() const { return true; }
  // Since an electric field can change track energy
  
  void GetFieldValue(const G4double pos[4], G4double *field) const;
  
  G4bool uniform;


  G4double R;

  
private:
  G4double flength, fpotential, fradius, fzmin, fzmax;


  G4ThreeVector position;
  G4ThreeVector EField;

};