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25 //
26 /// \file persistency/P02/src/ExP02DetectorConstruction.cc
27 /// \brief Implementation of the ExP02DetectorConstruction class
28 //
29 //
30 //
31 #include "ExP02DetectorConstruction.hh"
32
33 #include "G4Box.hh"
34 #include "G4LogicalVolume.hh"
35 #include "G4Material.hh"
36 #include "G4PVPlacement.hh"
37 #include "G4SystemOfUnits.hh"
38 #include "G4ThreeVector.hh"
39 #include "G4Tubs.hh"
40 #include "globals.hh"
41
42 // ROOT
43 #include "ExP02GeoTree.hh"
44 #include "TFile.h"
45 #include "TROOT.h"
46 #include "TSystem.h"
47
48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49
50 ExP02DetectorConstruction::ExP02DetectorConstruction()
51 : G4VUserDetectorConstruction(),
52 fExperimentalHall_log(0),
53 fTracker_log(0),
54 fCalorimeterBlock_log(0),
55 fCalorimeterLayer_log(0),
56 fExperimentalHall_phys(0),
57 fCalorimeterLayer_phys(0),
58 fCalorimeterBlock_phys(0),
59 fTracker_phys(0)
60 {
61 ;
62 }
63
64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
65
66 ExP02DetectorConstruction::~ExP02DetectorConstruction() {}
67
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70 G4VPhysicalVolume* ExP02DetectorConstruction::Construct()
71 {
72 //------------------------------------------------------ materials
73
74 G4double a; // atomic mass
75 G4double z; // atomic number
76 G4double density;
77
78 G4Material* Ar =
79 new G4Material("ArgonGas", z = 18., a = 39.95 * g / mole, density = 1.782 * mg / cm3);
80
81 G4Material* Al =
82 new G4Material("Aluminum", z = 13., a = 26.98 * g / mole, density = 2.7 * g / cm3);
83
84 G4Material* Pb =
85 new G4Material("Lead", z = 82., a = 207.19 * g / mole, density = 11.35 * g / cm3);
86
87 //------------------------------------------------------ volumes
88
89 //------------------------------ experimental hall (world volume)
90 //------------------------------ beam line along x axis
91
92 G4double expHall_x = 3.0 * m;
93 G4double expHall_y = 1.0 * m;
94 G4double expHall_z = 1.0 * m;
95 G4Box* experimentalHall_box = new G4Box("expHall_box", expHall_x, expHall_y, expHall_z);
96 fExperimentalHall_log = new G4LogicalVolume(experimentalHall_box, Ar, "expHall_log", 0, 0, 0);
97 fExperimentalHall_phys =
98 new G4PVPlacement(0, G4ThreeVector(), fExperimentalHall_log, "expHall", 0, false, 0);
99
100 //------------------------------ a tracker tube
101
102 G4double innerRadiusOfTheTube = 0. * cm;
103 G4double outerRadiusOfTheTube = 60. * cm;
104 G4double hightOfTheTube = 50. * cm;
105 G4double startAngleOfTheTube = 0. * deg;
106 G4double spanningAngleOfTheTube = 360. * deg;
107 G4Tubs* tracker_tube = new G4Tubs("tracker_tube", innerRadiusOfTheTube, outerRadiusOfTheTube,
108 hightOfTheTube, startAngleOfTheTube, spanningAngleOfTheTube);
109 fTracker_log = new G4LogicalVolume(tracker_tube, Al, "tracker_log", 0, 0, 0);
110 G4double trackerPos_x = -1.0 * m;
111 G4double trackerPos_y = 0. * m;
112 G4double trackerPos_z = 0. * m;
113 fTracker_phys = new G4PVPlacement(0, G4ThreeVector(trackerPos_x, trackerPos_y, trackerPos_z),
114 fTracker_log, "tracker", fExperimentalHall_log, false, 0);
115
116 //------------------------------ a calorimeter block
117
118 G4double block_x = 1.0 * m;
119 G4double block_y = 50.0 * cm;
120 G4double block_z = 50.0 * cm;
121 G4Box* calorimeterBlock_box = new G4Box("calBlock_box", block_x, block_y, block_z);
122 fCalorimeterBlock_log = new G4LogicalVolume(calorimeterBlock_box, Pb, "caloBlock_log", 0, 0, 0);
123 G4double blockPos_x = 1.0 * m;
124 G4double blockPos_y = 0.0 * m;
125 G4double blockPos_z = 0.0 * m;
126 fCalorimeterBlock_phys =
127 new G4PVPlacement(0, G4ThreeVector(blockPos_x, blockPos_y, blockPos_z), fCalorimeterBlock_log,
128 "caloBlock", fExperimentalHall_log, false, 0);
129
130 //------------------------------ calorimeter layers
131
132 G4double calo_x = 1. * cm;
133 G4double calo_y = 40. * cm;
134 G4double calo_z = 40. * cm;
135 G4Box* calorimeterLayer_box = new G4Box("caloLayer_box", calo_x, calo_y, calo_z);
136 fCalorimeterLayer_log = new G4LogicalVolume(calorimeterLayer_box, Al, "caloLayer_log", 0, 0, 0);
137 for (G4int i = 0; i < 19; i++) // loop for 19 layers
138 {
139 G4double caloPos_x = (i - 9) * 10. * cm;
140 G4double caloPos_y = 0.0 * m;
141 G4double caloPos_z = 0.0 * m;
142 fCalorimeterLayer_phys =
143 new G4PVPlacement(0, G4ThreeVector(caloPos_x, caloPos_y, caloPos_z), fCalorimeterLayer_log,
144 "caloLayer", fCalorimeterBlock_log, false, i);
145 }
146
147 //------------------------------------------------------------------
148
149 // writing the geometry to a ROOT file
150
151 // initialize ROOT
152 TSystem ts;
153
154 gSystem->Load("libExP02ClassesDict");
155
156 // gDebug = 1;
157
158 const G4ElementTable* eltab = G4Element::GetElementTable();
159
160 ExP02GeoTree* geotree = new ExP02GeoTree(fExperimentalHall_phys, eltab);
161
162 TFile fo("geo.root", "RECREATE");
163
164 fo.WriteObject(geotree, "my_geo");
165
166 return fExperimentalHall_phys;
167 }
168