P02/src/ExP02DetectorConstruction.cc

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0025 //
0026 /// \file persistency/P02/src/ExP02DetectorConstruction.cc
0027 /// \brief Implementation of the ExP02DetectorConstruction class
0028 //
0029 //
0030 //
0031 #include "ExP02DetectorConstruction.hh"
0032
0033 #include "G4Box.hh"
0034 #include "G4LogicalVolume.hh"
0035 #include "G4Material.hh"
0036 #include "G4PVPlacement.hh"
0037 #include "G4SystemOfUnits.hh"
0038 #include "G4ThreeVector.hh"
0039 #include "G4Tubs.hh"
0040 #include "globals.hh"
0041
0042 // ROOT
0043 #include "ExP02GeoTree.hh"
0044 #include "TFile.h"
0045 #include "TROOT.h"
0046 #include "TSystem.h"
0047
0048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0049
0050 ExP02DetectorConstruction::ExP02DetectorConstruction()
0051   : G4VUserDetectorConstruction(),
0052     fExperimentalHall_log(0),
0053     fTracker_log(0),
0054     fCalorimeterBlock_log(0),
0055     fCalorimeterLayer_log(0),
0056     fExperimentalHall_phys(0),
0057     fCalorimeterLayer_phys(0),
0058     fCalorimeterBlock_phys(0),
0059     fTracker_phys(0)
0060 {
0061   ;
0062 }
0063
0064 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0065
0066 ExP02DetectorConstruction::~ExP02DetectorConstruction() {}
0067
0068 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0069
0070 G4VPhysicalVolume* ExP02DetectorConstruction::Construct()
0071 {
0072   //------------------------------------------------------ materials
0073
0074   G4double a;  // atomic mass
0075   G4double z;  // atomic number
0076   G4double density;
0077
0078   G4Material* Ar =
0079     new G4Material("ArgonGas", z = 18., a = 39.95 * g / mole, density = 1.782 * mg / cm3);
0080
0081   G4Material* Al =
0082     new G4Material("Aluminum", z = 13., a = 26.98 * g / mole, density = 2.7 * g / cm3);
0083
0084   G4Material* Pb =
0085     new G4Material("Lead", z = 82., a = 207.19 * g / mole, density = 11.35 * g / cm3);
0086
0087   //------------------------------------------------------ volumes
0088
0089   //------------------------------ experimental hall (world volume)
0090   //------------------------------ beam line along x axis
0091
0092   G4double expHall_x = 3.0 * m;
0093   G4double expHall_y = 1.0 * m;
0094   G4double expHall_z = 1.0 * m;
0095   G4Box* experimentalHall_box = new G4Box("expHall_box", expHall_x, expHall_y, expHall_z);
0096   fExperimentalHall_log = new G4LogicalVolume(experimentalHall_box, Ar, "expHall_log", 0, 0, 0);
0097   fExperimentalHall_phys =
0098     new G4PVPlacement(0, G4ThreeVector(), fExperimentalHall_log, "expHall", 0, false, 0);
0099
0100   //------------------------------ a tracker tube
0101
0102   G4double innerRadiusOfTheTube = 0. * cm;
0103   G4double outerRadiusOfTheTube = 60. * cm;
0104   G4double hightOfTheTube = 50. * cm;
0105   G4double startAngleOfTheTube = 0. * deg;
0106   G4double spanningAngleOfTheTube = 360. * deg;
0107   G4Tubs* tracker_tube = new G4Tubs("tracker_tube", innerRadiusOfTheTube, outerRadiusOfTheTube,
0108                                     hightOfTheTube, startAngleOfTheTube, spanningAngleOfTheTube);
0109   fTracker_log = new G4LogicalVolume(tracker_tube, Al, "tracker_log", 0, 0, 0);
0110   G4double trackerPos_x = -1.0 * m;
0111   G4double trackerPos_y = 0. * m;
0112   G4double trackerPos_z = 0. * m;
0113   fTracker_phys = new G4PVPlacement(0, G4ThreeVector(trackerPos_x, trackerPos_y, trackerPos_z),
0114                                     fTracker_log, "tracker", fExperimentalHall_log, false, 0);
0115
0116   //------------------------------ a calorimeter block
0117
0118   G4double block_x = 1.0 * m;
0119   G4double block_y = 50.0 * cm;
0120   G4double block_z = 50.0 * cm;
0121   G4Box* calorimeterBlock_box = new G4Box("calBlock_box", block_x, block_y, block_z);
0122   fCalorimeterBlock_log = new G4LogicalVolume(calorimeterBlock_box, Pb, "caloBlock_log", 0, 0, 0);
0123   G4double blockPos_x = 1.0 * m;
0124   G4double blockPos_y = 0.0 * m;
0125   G4double blockPos_z = 0.0 * m;
0126   fCalorimeterBlock_phys =
0127     new G4PVPlacement(0, G4ThreeVector(blockPos_x, blockPos_y, blockPos_z), fCalorimeterBlock_log,
0128                       "caloBlock", fExperimentalHall_log, false, 0);
0129
0130   //------------------------------ calorimeter layers
0131
0132   G4double calo_x = 1. * cm;
0133   G4double calo_y = 40. * cm;
0134   G4double calo_z = 40. * cm;
0135   G4Box* calorimeterLayer_box = new G4Box("caloLayer_box", calo_x, calo_y, calo_z);
0136   fCalorimeterLayer_log = new G4LogicalVolume(calorimeterLayer_box, Al, "caloLayer_log", 0, 0, 0);
0137   for (G4int i = 0; i < 19; i++)  // loop for 19 layers
0138   {
0139     G4double caloPos_x = (i - 9) * 10. * cm;
0140     G4double caloPos_y = 0.0 * m;
0141     G4double caloPos_z = 0.0 * m;
0142     fCalorimeterLayer_phys =
0143       new G4PVPlacement(0, G4ThreeVector(caloPos_x, caloPos_y, caloPos_z), fCalorimeterLayer_log,
0144                         "caloLayer", fCalorimeterBlock_log, false, i);
0145   }
0146
0147   //------------------------------------------------------------------
0148
0149   // writing the geometry to a ROOT file
0150
0151   // initialize ROOT
0152   TSystem ts;
0153
0154   gSystem->Load("libExP02ClassesDict");
0155
0156   //  gDebug = 1;
0157
0158   const G4ElementTable* eltab = G4Element::GetElementTable();
0159
0160   ExP02GeoTree* geotree = new ExP02GeoTree(fExperimentalHall_phys, eltab);
0161
0162   TFile fo("geo.root", "RECREATE");
0163
0164   fo.WriteObject(geotree, "my_geo");
0165
0166   return fExperimentalHall_phys;
0167 }