Problem with local magnetic field

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Hello,

I am trying to add a local magnetic field into a box, and I encounter several compiler errors that I can`t fix. I managed to add a global uniform magnetic field but it is not what I need, so after searching the forum and studying some .ppt I found at some workshops I managed to add the code, but I get the following errors:

--------------- root@ubuntu:~/GeantProjects/teste/N01# make

Making dependency for file src/ExN01DetectorConstruction.cc ...

Compiling ExN01DetectorConstruction.cc ...

src/ExN01DetectorConstruction.cc: In member function virtual G4VPhysicalVolume* ExN01DetectorConstruction::Construct():

src/ExN01DetectorConstruction.cc:72: error: expected type-specifier before G4ClassicalRK4

src/ExN01DetectorConstruction.cc:72: error: cannot convert int* to G4MagIntegratorStepper* in initialization

src/ExN01DetectorConstruction.cc:72: error: expected , or ; before G4ClassicalRK4

src/ExN01DetectorConstruction.cc:70: warning: unused variable myEquation

make: *** [/home/oem/GeantProjects/tmp/Linux-g++/testN01/ExN01DetectorConstruction.o] Error 1

------------------

Can you help me figure out what am I doing wrong? I have the following detectorconstruction source:

-------------------- #include "ExN01DetectorConstruction.hh"

#include "G4Material.hh"
#include "G4Box.hh"
#include "G4Tubs.hh"
#include "G4LogicalVolume.hh"
#include "G4ThreeVector.hh"
#include "G4PVPlacement.hh"
#include "globals.hh"
#include "G4NistManager.hh"

#include <G4UniformMagField.hh>
#include <G4FieldManager.hh>
#include <G4TransportationManager.hh>

#include <G4Mag_UsualEqRhs.hh>
#include <G4MagIntegratorStepper.hh>
#include <G4ChordFinder.hh>

ExN01DetectorConstruction::ExN01DetectorConstruction()
 :  experimentalHall_log(0), tracker_log(0),
    calorimeterBlock_log(0), calorimeterLayer_log(0),
    experimentalHall_phys(0), calorimeterLayer_phys(0),
    calorimeterBlock_phys(0), tracker_phys(0)
{;}

ExN01DetectorConstruction::~ExN01DetectorConstruction() { }

G4VPhysicalVolume* ExN01DetectorConstruction::Construct() {

  //------------------------------------------------------ materiale - definire materiale

  G4double a;  
  G4double z; 
  G4double density;

  G4Material* Pb = new G4Material("Lead", z= 82., a= 207.19*g/mole, density= 11.35*g/cm3); // Plumb sau Fier

  G4NistManager* man = G4NistManager::Instance();
  G4Material* Air  = man->FindOrBuildMaterial("G4_AIR"); // Aer
  G4cout <<Air<<"\r";                               
 G4cout << *(G4Material::GetMaterialTable()); // lista materiale

  //------------------------------------------------------ volumes

  //------------------------------ experimental hall (world volume)
  //------------------------------ beam line along x axis

  G4double expHall_x = 6.0*m;
  G4double expHall_y = 3.0*m;
  G4double expHall_z = 3.0*m;
  G4Box* experimentalHall_box = new G4Box("World_Box_Shape",expHall_x,expHall_y,expHall_z); // dedinesc shape pt World Volume
  experimentalHall_log = new G4LogicalVolume(experimentalHall_box, Air,"World_Box__Logical",0,0,0); // definesc proprietati pentru World Volume
  experimentalHall_phys = new G4PVPlacement(0,G4ThreeVector(), experimentalHall_log,"World_Box",0,false,0); //pozitionez in scena World Volume

  G4double block_x = 1.0*m;
  G4double block_y = 50.0*cm;
  G4double block_z = 50.0*cm;

  G4double fieldValue = 10.0*tesla;
  G4UniformMagField* myField =new G4UniformMagField(G4ThreeVector(0.0,fieldValue,0.0));

  G4Mag_UsualEqRhs* myEquation = new G4Mag_UsualEqRhs(myField);

  G4MagIntegratorStepper* myStepper = new G4ClassicalRK4(myEquation);

  G4ChordFinder* myChordFinder = new G4ChordFinder(myField,0.01*mm,myStepper);

  G4FieldManager* fieldMgr = new G4FieldManager(myField,myChordFinder);

  G4Box* calorimeterBlock_box = new G4Box("calorimetru_box", block_x, block_y, block_z);
  calorimeterBlock_log = new G4LogicalVolume(calorimeterBlock_box,Pb,"calorimetru_log", fieldMgr,0,0); //camp mg

  G4double blockPos_x = 1.0*m;
  G4double blockPos_y = 0.0*m;
  G4double blockPos_z = 0.0*m;

  calorimeterBlock_phys = new G4PVPlacement(0,G4ThreeVector(blockPos_x,blockPos_y,blockPos_z),calorimeterBlock_log,"calorimetru",experimentalHall_log,false,0);

return experimentalHall_phys; }

------------------------

Thank you for you time.