MuonWallTool.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
//************************************************************
//
// Class MuonWallTool
// Class implementing geometry of the MuonWall
//
//************************************************************
 
// class header
#include "MuonWallTool.h"
 
//Athena headers
#include "GeoModelInterfaces/StoredMaterialManager.h"
#include "GeoModelKernel/GeoMaterial.h"
#include "GeoMaterial2G4/Geo2G4MaterialFactory.h"
 
// Geant4 headers
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4Material.hh"
#include "G4PVPlacement.hh"
#include "G4ThreeVector.hh"
 
// CLHEP headers
#include "CLHEP/Units/SystemOfUnits.h"
 
// STL headers
#include <string>
#include <iostream>
 
MuonWallTool::MuonWallTool(const std::string& type, const std::string& name, const IInterface* parent)
  : DetectorGeometryBase(type,name,parent)
{
}
 
void MuonWallTool::BuildGeometry() {
 
  ATH_MSG_DEBUG( "Building Geometry back muon wall: "
                 << (m_backWall ? "true" : "false")
                 << "  side muon wall: "
                 << (m_sideWall ? "true" : "false") );
 
  // MuonWall description :
 
  // Scintillator : 400*200*20, calculating half-size
  const double zScintillator = m_zLength / 2.;
  const double yScintillator = m_yLength / 2.;
  const double xScintillator = m_xLength / 2.;
  const double dzmuonwall = 750. * CLHEP::mm;
  const double dymuonwall = 425. * CLHEP::mm;
  const double dxmuonwall = xScintillator;
 
  G4Box *wall = new G4Box("MuonWall", dxmuonwall, dymuonwall, dzmuonwall);
 
  // Get the materials
  StoredMaterialManager* materialManager = nullptr;
  if (StatusCode::SUCCESS != detStore()->retrieve(materialManager, std::string("MATERIALS"))) {
    ATH_MSG_ERROR( "Could not find Material Manager MATERIALS" );
    return;
  }
 
  const GeoMaterial *geoAir = materialManager->getMaterial("tile::Air");
  const GeoMaterial *geoScintillator = materialManager->getMaterial("tile::Scintillator");
  Geo2G4MaterialFactory theMaterialFactory;
  G4Material *airMaterial = theMaterialFactory.Build(geoAir);
  G4Material *scintillatorMaterial = theMaterialFactory.Build(geoScintillator);
 
  G4LogicalVolume *wallV = new G4LogicalVolume(wall, airMaterial, "MuonWall");
 
  // ------- Create lead layers and place them inside the mother box --------
  double zLayer, yLayer, xLayer = 0.;
 
  if (m_backWall) {
 
    const int nrOfLayers = 12;
 
    for (int j = 0; j < nrOfLayers; j++) {
 
      // Scintillator
      G4Box *scintillatorLayer = new G4Box("ScintillatorLayer", xScintillator, yScintillator, zScintillator);
 
      G4LogicalVolume *scintillatorLayerV = new G4LogicalVolume(scintillatorLayer, scintillatorMaterial,
          "MuScintillatorLayer");
 
      // scintillatorLayerV->GetLogicalVolume()->SetSensitiveDetector(muonwallSD);
 
      if (j < 6) {
        yLayer = yScintillator + 25. * CLHEP::mm;
        zLayer = -450. * CLHEP::mm + (2 * j + 1) * zScintillator;
      } else {
        yLayer = -yScintillator + 25. * CLHEP::mm;
        zLayer = -450. * CLHEP::mm + (2 * (j - 6) + 1) * zScintillator;
      }
 
      G4PVPlacement* scintillatorLayerVPhys __attribute__((unused)) =
          new G4PVPlacement(0,
                            G4ThreeVector(xLayer,yLayer,zLayer),
                            scintillatorLayerV,
                            "MuScintillatorLayer",
                            wallV,
                            false,
                            j+1);
      }
  }
 
  if (m_sideWall) {
 
    // Scintillator : 500*100*20 instead of 400*200*20
    const double yScintillator1 = yScintillator + 50. * CLHEP::mm;
    const double zScintillator1 = zScintillator - 50. * CLHEP::mm;
 
    const int nScintLayers = 3;
 
    for (int j = 0; j < nScintLayers; j++) {
 
      G4Box* scintillatorLayer = new G4Box("SideScintiLayer", xScintillator, yScintillator1, zScintillator1);
 
      G4LogicalVolume* scintillatorLayerV = new G4LogicalVolume(scintillatorLayer, scintillatorMaterial,
          "SideMuScintiLayer");
 
      yLayer = -175. * CLHEP::mm;
      zLayer = -750. * CLHEP::mm + (2 * j + 1) * zScintillator1;
 
      G4PVPlacement* scintillatorLayerVPhys __attribute__((unused)) =
          new G4PVPlacement(0,
                            G4ThreeVector(xLayer,yLayer,zLayer),
                            scintillatorLayerV,
                            "SideMuScintiLayer",
                            wallV,
                            false,
                            j+1);
      }
  }
 
  // FINAL STEP
  m_envelope.theEnvelope = wallV;
}