ExN05ParallelWorldForPion.cc

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#include "ExN05ParallelWorldForPion.hh"
#include "ExN05PionShowerModel.hh"

#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4Region.hh"
#include "G4PVPlacement.hh"
#include "G4ThreeVector.hh"
#include "G4SystemOfUnits.hh"

ExN05ParallelWorldForPion::ExN05ParallelWorldForPion(G4String worldName)
  : G4VUserParallelWorld(worldName)
{;}

ExN05ParallelWorldForPion::~ExN05ParallelWorldForPion()
{;}

void ExN05ParallelWorldForPion::Construct()
{
  // -- fake material:
  G4double a, iz, density;
  G4String name, symbol;
  G4int nel;
  a = 14.01*g/mole;
  G4Element* elN = new G4Element(name="Nitrogen", symbol="N",  iz=7.,  a);
  a = 16.00*g/mole;
  G4Element* elO = new G4Element(name="Oxigen",   symbol="O",  iz=8.,  a);
  density = 1.29e-03*g/cm3;
  G4Material* Air = new G4Material(name="Air", density, nel=2);
  Air->AddElement(elN, .7);
  Air->AddElement(elO, .3);

  // -------------------------------
  //  Build parallel/ghost geometry:
  // -------------------------------

  // -- Obtain clone of mass geometry world from GetWorld() base class utility:
  G4VPhysicalVolume* ghostWorld = GetWorld();
  // -- Why needed ? No default ?
  ghostWorld->GetLogicalVolume()->SetMaterial(Air);
  G4Region* parallelWorldRegion = new G4Region("ParallelWorldRegion");
  parallelWorldRegion->AddRootLogicalVolume(ghostWorld->GetLogicalVolume());
  
  // -- Create box for encompassing Elec.+Had. calorimeters together:
  G4double detectSize = 125*cm;
  G4Box *ghostBox
    = new G4Box("GhostBox", detectSize+5*cm, detectSize+5*cm, 80*cm);
  // -- Build the subsequent logical volume:
  G4LogicalVolume* ghostLogical
    = new G4LogicalVolume(ghostBox,
                          Air,               // -- no material : IMPOSSIBLE !!!
                          "GhostLogical", 
                          0, 0, 0);
  // -- And place this logical volume in the parallel geometry:
  new G4PVPlacement(0,G4ThreeVector(0., 0., 175*cm),
                    "GhostPhysical",
                    ghostLogical,
                    ghostWorld,false,0);

  // -----------------------
  //  Setup fast simulation:
  // -----------------------

  // -- Make Elec+Had logical volume becoming a region:
  G4cout << "Declaring region..." << G4endl;
  G4Region* ghostRegion = new G4Region("GhostCalorimeterRegion");
  G4cout << "... region declared. Setting it the ghostLogical volume..." << G4endl;
  ghostRegion->AddRootLogicalVolume(ghostLogical);
  G4cout << "... succes.\n" << G4endl;

  //  // -- Create fast simulation manager, which will handle the physics fast simulation model(s):
  //  new G4FastSimulationManager(ghostRegion);

  // -- Attach fast simulation model (create the G4FastSimulationManager if needed):
  new ExN05PionShowerModel("ghostPionShowerModel",ghostRegion);
  
}