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DetectorBari05.cc
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32 
33 #include "DetectorBari05.hh"
34 #include "SensitiveDetector.hh"
35 #include "Materials.hh"
36 
37 #include "G4Material.hh"
38 #include "G4Box.hh"
39 #include "G4LogicalVolume.hh"
40 #include "G4PVPlacement.hh"
41 #include "G4UniformMagField.hh"
42 #include "G4FieldManager.hh"
43 #include "G4TransportationManager.hh"
44 #include "G4SDManager.hh"
45 
46 #include "G4Region.hh"
47 
48 #include "G4UnitsTable.hh"
49 #include "G4SystemOfUnits.hh"
50 #include "G4ios.hh"
51 
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
53 
54 DetectorBari05::DetectorBari05()
55  : fRadiatorDescription(0)
56 {}
57 
58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59 
60 DetectorBari05::~DetectorBari05()
61 {
62  // delete fRadiatorDescription;
63  // the description is deleted in detector construction
64 }
65 
66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
67 
68 G4VPhysicalVolume* DetectorBari05::Construct()
69 {
70  // Geometry parameters
71  //
72 
73  G4cout << "DetectorBari05 setup" << G4endl;
74 
75  G4double worldSizeZ = 600.*cm;
76  G4double worldSizeR = 22.*cm;
77 
78  // Radiator and detector parameters
79 
80  G4double radThickness = 0.0055*mm; // Reg2
81  G4double gasGap = 0.23*mm; // Reg2
82  G4double foilGasRatio = radThickness/(radThickness+gasGap);
83  G4double foilNumber = 191; // Reg2
84 
85  G4double absorberThickness = 0.4*mm;
86  G4double absorberRadius = 100.*mm;
87 
88  G4double electrodeThick = 100.0*micrometer;
89  G4double pipeLength = 50.0*cm;
90  G4double mylarThick = 20.0*micrometer;
91  G4double detGap = 0.01*mm;
92 
93  G4double startZ = 100.0*mm;
94 
95  // Preparation of mixed radiator material
96 
97 
98  // Materials
99  //
100 
101  // Change to create materials using NIST
102  G4Material* air = Materials::GetInstance()->GetMaterial("Air");
103  G4Material* ch2 = Materials::GetInstance()->GetMaterial("CH2");
104  G4Material* he = Materials::GetInstance()->GetMaterial("He");
105  G4Material* si = Materials::GetInstance()->GetMaterial("Si");
106 
107  G4double foilDensity = ch2->GetDensity();
108  G4double gasDensity = air->GetDensity();
109  G4double totDensity = foilDensity*foilGasRatio
110  + gasDensity*(1.0-foilGasRatio);
111 
112  G4double fractionFoil = foilDensity*foilGasRatio/totDensity;
113  G4double fractionGas = gasDensity*(1.0-foilGasRatio)/totDensity;
114  G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
115  radiatorMat->AddMaterial(ch2, fractionFoil);
116  radiatorMat->AddMaterial(air, fractionGas);
117 
118  // Radiator description
119  fRadiatorDescription = new RadiatorDescription;
120  fRadiatorDescription->fFoilMaterial = ch2; // CH2; // Kapton; // Mylar ; // Li ; // CH2 ;
121  fRadiatorDescription->fGasMaterial = air; // CO2; // He; //
122  fRadiatorDescription->fFoilThickness = radThickness;
123  fRadiatorDescription->fGasThickness = gasGap;
124  fRadiatorDescription->fFoilNumber = foilNumber;
125 
126  // pipe material is assumed to be He + small admixture of air
127  foilGasRatio = 0.99999;
128  foilDensity = 1.2928*mg/cm3; // Air
129  gasDensity = 0.178*mg/cm3; // He
130  totDensity = foilDensity*foilGasRatio + gasDensity*(1.0-foilGasRatio);
131 
132  fractionFoil = foilDensity*foilGasRatio/totDensity;
133  fractionGas = gasDensity*(1.0-foilGasRatio)/totDensity;
134 
135  G4Material* pipeMat = new G4Material("pipeMat", totDensity, 2);
136  pipeMat->AddMaterial(air, fractionFoil);
137  pipeMat->AddMaterial(he, fractionGas);
138 
139 
140  G4Material* worldMaterial = air; // CO2;
141  G4Material* absorberMaterial = si;
142 
143  // Volumes
144  //
145 
146  G4VSolid* solidWorld
147  = new G4Box("World", worldSizeR, worldSizeR, worldSizeZ/2.);
148 
149  G4LogicalVolume* logicWorld
150  = new G4LogicalVolume(solidWorld, worldMaterial, "World");
151 
152  G4VPhysicalVolume* physicsWorld
153  = new G4PVPlacement(0, G4ThreeVector(), "World", logicWorld, 0, false, 0);
154 
155  // TR radiator envelope
156 
157  G4double radThick = foilNumber*(radThickness + gasGap) - gasGap + detGap;
158  G4double radZ = startZ + 0.5*radThick;
159 
160  G4VSolid* solidRadiator
161  = new G4Box("Radiator", 1.1*absorberRadius, 1.1*absorberRadius, 0.5*radThick);
162 
163  G4LogicalVolume* logicRadiator
164  = new G4LogicalVolume(solidRadiator, radiatorMat, "Radiator");
165 
166  new G4PVPlacement(0, G4ThreeVector(0, 0, radZ),
167  "Radiator", logicRadiator, physicsWorld, false, 0 );
168 
169  fRadiatorDescription->fLogicalVolume = logicRadiator;
170 
171  // create region for window inside windowR for
172 
173  G4Region* radRegion = new G4Region("XTRradiator");
174  radRegion->AddRootLogicalVolume(logicRadiator);
175 
176  // Drift Electrode on both sides of Radiator:
177  // (not placed)
178 
179  G4double zElectrode1 = radZ - radThick/2. - electrodeThick/2.;
180  G4double zElectrode2 = radZ + radThick/2. + electrodeThick/2.;
181 
182  G4cout << "zElectrode1 = " << zElectrode1/mm << " mm" << G4endl;
183  G4cout << "zElectrode2 = " << zElectrode2/mm << " mm" << G4endl;
184  G4cout << "electrodeThick = " << electrodeThick/mm << " mm" << G4endl << G4endl;
185 
186  // Helium Pipe
187  // (not placed)
188 
189  G4double pipeDist = 1.*cm; //Distance between pipe and radiator / absorber
190  G4double zPipe = zElectrode2 + electrodeThick/2. + pipeLength/2. + pipeDist/2.;
191 
192  G4cout << "zPipe = " << zPipe/mm << " mm" << G4endl;
193  G4cout << "pipeLength = " << pipeLength/mm << " mm" << G4endl << G4endl;
194 
195  // Mylar Foil on both sides of helium pipe
196  // (not placed)
197 
198  G4double zMylar1 = zPipe - pipeLength/2. - mylarThick/2 - 0.01*mm;
199  G4double zMylar2 = zPipe + pipeLength/2. + mylarThick/2 + 0.01*mm;
200 
201  G4cout << "zMylar1 = " << zMylar1/mm << " mm" << G4endl;
202  G4cout << "zMylar2 = " << zMylar2/mm << " mm" << G4endl;
203  G4cout << "fMylarThick = " << mylarThick/mm << " mm" << G4endl << G4endl;
204 
205  // Mylar Foil on Chamber
206  // (not placed)
207 
208  G4double zMylar = zElectrode2 + electrodeThick/2. + mylarThick/2. + 1.0*mm;
209  zMylar += ( pipeLength + pipeDist );
210 
211  G4cout << "zMylar = " << zMylar/mm <<" mm" <<G4endl;
212  G4cout << "mylarThick = " << mylarThick/mm << " mm" << G4endl << G4endl;
213 
214  // Absorber
215 
216  G4double absorberZ = zMylar + mylarThick/2. + absorberThickness/2.;
217 
218  G4VSolid* solidAbsorber
219  = new G4Box("Absorber", 10.*mm, 10.*mm, absorberThickness/2.);
220 
221  G4LogicalVolume* logicAbsorber
222  = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
223 
224  new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ),
225  "Absorber", logicAbsorber, physicsWorld, false, 0);
226 
227  // Create region for radiator
228 
229  G4Region* regGasDet = new G4Region("XTRdEdxDetector");
230  regGasDet->AddRootLogicalVolume(logicAbsorber);
231 
232  // Sensitive Detectors: Absorber
233 
234  SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
235  G4SDManager::GetSDMpointer()->AddNewDetector(sd );
236  logicAbsorber->SetSensitiveDetector(sd);
237 
238  // Print geometry parameters
239 
240  G4cout << "\n The WORLD is made of "
241  << worldSizeZ/mm << "mm of " << worldMaterial->GetName();
242  G4cout << ", the transverse size (R) of the world is "
243  << worldSizeR/mm << " mm. " << G4endl;
244  G4cout << " The ABSORBER is made of "
245  << absorberThickness/mm << "mm of " << absorberMaterial->GetName();
246  G4cout << ", the transverse size (R) is "
247  << absorberRadius/mm << " mm. " << G4endl;
248  G4cout << " Z position of the (middle of the) absorber "
249  << absorberZ/mm << " mm." << G4endl;
250 
251  G4cout << "radZ = " << radZ/mm << " mm" << G4endl;
252  G4cout << "startZ = " << startZ/mm<< " mm" << G4endl;
253 
254  G4cout << "fRadThick = " << radThick/mm << " mm"<<G4endl;
255  G4cout << "fFoilNumber = " << foilNumber << G4endl;
256  G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
257  G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
258  G4cout << G4endl;
259 
260  return physicsWorld;
261 }
262 
263 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......