py8decayer/src/DetConstruction.cc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 //
0027 /// \file eventgenerator/pythia/pythia8decayer/src/DetConstruction.cc
0028 /// \brief Implementation of the DetConstruction class
0029 ///
0030 /// \author J. Yarba; FNAL
0031
0032 #include "DetConstruction.hh"
0033
0034 #include "G4Box.hh"
0035 #include "G4LogicalVolume.hh"
0036 #include "G4Material.hh"
0037 #include "G4NistManager.hh"
0038 #include "G4PVPlacement.hh"
0039 #include "G4Tubs.hh"
0040
0041 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0042
0043 G4VPhysicalVolume* DetConstruction::Construct()
0044 {
0045   // Define materials via NIST manager
0046
0047   auto worldMaterial = G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR");
0048   auto detMaterial = G4NistManager::Instance()->FindOrBuildMaterial("G4_C");
0049
0050   // World volume
0051
0052   G4ThreeVector worldSize(200. * CLHEP::cm, 200. * CLHEP::cm, 200. * CLHEP::cm);
0053
0054   fWorld =
0055     new G4PVPlacement(0, G4ThreeVector(), "world_phys",
0056                       new G4LogicalVolume(new G4Box("world_solid", 0.5 * worldSize.x(),
0057                                                     0.5 * worldSize.y(), 0.5 * worldSize.z()),
0058                                           worldMaterial, "world_log", 0, 0, 0),
0059                       0, false, 0);
0060
0061   // "Detector"
0062
0063   double rmin = 10. * CLHEP::cm;
0064   double rmax = 80. * CLHEP::cm;
0065   double zlength = 98. * CLHEP::cm;
0066
0067   G4VSolid* sDet = new G4Tubs("det_solid", rmin, rmax, 0.5 * zlength, 0., 2. * CLHEP::pi);
0068
0069   G4LogicalVolume* lDet = new G4LogicalVolume(sDet, detMaterial, "det_log", 0, 0, 0);
0070
0071   fDet = new G4PVPlacement(0, G4ThreeVector(), "det_phys", lDet,
0072                            fWorld,  // it's mother (physical) volume
0073                            false, 0);
0074
0075   // always return the root volume
0076   //
0077   return fWorld;
0078 }
0079
0080 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......