Par01ParallelWorldForPion.cc

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// $Id: Par01ParallelWorldForPion.cc 100936 2016-11-03 11:07:41Z gcosmo $
//
#include "Par01ParallelWorldForPion.hh"
#include "Par01PionShowerModel.hh"

#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4Region.hh"
#include "G4PVPlacement.hh"
#include "G4ThreeVector.hh"
#include "G4SystemOfUnits.hh"
#include "G4NistManager.hh"

#include "G4RegionStore.hh"

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Par01ParallelWorldForPion::Par01ParallelWorldForPion(G4String worldName)
  : G4VUserParallelWorld(worldName)
{;}

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Par01ParallelWorldForPion::~Par01ParallelWorldForPion()
{;}

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void Par01ParallelWorldForPion::Construct()
{
  // -- Get nist material manager
  G4NistManager* nistManager = G4NistManager::Instance();
  
  // Build materials
  G4Material* air = nistManager->FindOrBuildMaterial("G4_AIR");
  
  // -------------------------------
  //  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;
  
}

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void Par01ParallelWorldForPion::ConstructSD()
{
  G4RegionStore* regionStore = G4RegionStore::GetInstance();
  
  G4Region* ghostRegion = regionStore->GetRegion("GhostCalorimeterRegion");
  // -- Attach fast simulation model (create the G4FastSimulationManager if needed):
  new Par01PionShowerModel("ghostPionShowerModel",ghostRegion);
  
}