//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
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// ********************************************************************
//
//
  G4double EField = 0.0*kilovolt/cm;

  // create electric field
  G4UniformElectricField* elecField = 
     new G4UniformElectricField(G4ThreeVector(0,EField,0));

  // equation of motion
  G4EqMagElectricField* EquationOfMotion = 
    new G4EqMagElectricField(elecField);

  // stepper for equation of motion
  G4MagIntegratorStepper* DMXStepper = 
    new G4ClassicalRK4(EquationOfMotion); 

  // chordfinder
  G4ChordFinder* DMXChordFinder =
    new G4ChordFinder(elecField, 1.0e-3*mm, DMXStepper);

  // field manager
  G4FieldManager* DMXFieldManager = new G4FieldManager();
  DMXFieldManager->SetChordFinder(DMXChordFinder);  
  G4TransportationManager::GetTransportationManager()
    -> SetFieldManager(DMXFieldManager);