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// $Id$
//
/// \file B2bDetectorConstruction.hh
/// \brief Definition of the B2bDetectorConstruction class

#ifndef B2bDetectorConstruction_h
#define B2bDetectorConstruction_h 1

#include "globals.hh"
#include "G4VUserDetectorConstruction.hh"
#include "tls.hh"

class G4VPhysicalVolume;
class G4LogicalVolume;
class G4Material;
class G4UserLimits;
class G4GlobalMagFieldMessenger;

class B2bDetectorMessenger;

/// Detector construction class to define materials, geometry
/// and global uniform magnetic field.

class B2bDetectorConstruction : public G4VUserDetectorConstruction
{
  public:
    B2bDetectorConstruction();
    virtual ~B2bDetectorConstruction();

  public:
    virtual G4VPhysicalVolume* Construct();
    virtual void ConstructSDandField();

    // Set methods
    void SetTargetMaterial (G4String );
    void SetChamberMaterial(G4String );
    void SetMaxStep (G4double );
    void SetCheckOverlaps(G4bool );

  private:
    // methods
    void DefineMaterials();
    G4VPhysicalVolume* DefineVolumes();
  
    // data members
    G4LogicalVolume*   fLogicTarget;     // pointer to the logical Target
    G4LogicalVolume*   fLogicChamber;    // pointer to the logical Chamber

    G4Material*        fTargetMaterial;  // pointer to the target  material
    G4Material*        fChamberMaterial; // pointer to the chamber material

    G4UserLimits*      fStepLimit;       // pointer to user step limits

    B2bDetectorMessenger*  fMessenger;   // detector messenger
    
    static G4ThreadLocal G4GlobalMagFieldMessenger*  fMagFieldMessenger; 
                                         // magnetic field messenger
    
    G4bool  fCheckOverlaps; // option to activate checking of volumes overlaps 
};

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#endif