source: trunk/examples/novice/N02/src/ExN02DetectorConstruction.cc@ 812

Last change on this file since 812 was 807, checked in by garnier, 17 years ago

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27// $Id: ExN02DetectorConstruction.cc,v 1.20 2007/10/17 08:50:35 gcosmo Exp $
28// GEANT4 tag $Name: $
29//
30//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32
33#include "ExN02DetectorConstruction.hh"
34#include "ExN02DetectorMessenger.hh"
35#include "ExN02ChamberParameterisation.hh"
36#include "ExN02MagneticField.hh"
37#include "ExN02TrackerSD.hh"
38
39#include "G4Material.hh"
40#include "G4Box.hh"
41#include "G4LogicalVolume.hh"
42#include "G4PVPlacement.hh"
43#include "G4PVParameterised.hh"
44#include "G4SDManager.hh"
45#include "G4GeometryTolerance.hh"
46#include "G4GeometryManager.hh"
47
48#include "G4UserLimits.hh"
49
50#include "G4VisAttributes.hh"
51#include "G4Colour.hh"
52
53#include "G4ios.hh"
54
55//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56
57ExN02DetectorConstruction::ExN02DetectorConstruction()
58:solidWorld(0), logicWorld(0), physiWorld(0),
59 solidTarget(0), logicTarget(0), physiTarget(0),
60 solidTracker(0),logicTracker(0),physiTracker(0),
61 solidChamber(0),logicChamber(0),physiChamber(0),
62 TargetMater(0), ChamberMater(0),chamberParam(0),
63 stepLimit(0), fpMagField(0),
64 fWorldLength(0.), fTargetLength(0.), fTrackerLength(0.),
65 NbOfChambers(0) , ChamberWidth(0.), ChamberSpacing(0.)
66{
67 fpMagField = new ExN02MagneticField();
68 detectorMessenger = new ExN02DetectorMessenger(this);
69}
70
71//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
72
73ExN02DetectorConstruction::~ExN02DetectorConstruction()
74{
75 delete fpMagField;
76 delete stepLimit;
77 delete chamberParam;
78 delete detectorMessenger;
79}
80
81//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
82
83G4VPhysicalVolume* ExN02DetectorConstruction::Construct()
84{
85//--------- Material definition ---------
86
87 G4double a, z;
88 G4double density, temperature, pressure;
89 G4int nel;
90
91 //Air
92 G4Element* N = new G4Element("Nitrogen", "N", z=7., a= 14.01*g/mole);
93 G4Element* O = new G4Element("Oxygen" , "O", z=8., a= 16.00*g/mole);
94
95 G4Material* Air = new G4Material("Air", density= 1.29*mg/cm3, nel=2);
96 Air->AddElement(N, 70*perCent);
97 Air->AddElement(O, 30*perCent);
98
99 //Lead
100 G4Material* Pb =
101 new G4Material("Lead", z=82., a= 207.19*g/mole, density= 11.35*g/cm3);
102
103 //Xenon gas
104 G4Material* Xenon =
105 new G4Material("XenonGas", z=54., a=131.29*g/mole, density= 5.458*mg/cm3,
106 kStateGas, temperature= 293.15*kelvin, pressure= 1*atmosphere);
107
108 // Print all the materials defined.
109 //
110 G4cout << G4endl << "The materials defined are : " << G4endl << G4endl;
111 G4cout << *(G4Material::GetMaterialTable()) << G4endl;
112
113//--------- Sizes of the principal geometrical components (solids) ---------
114
115 NbOfChambers = 5;
116 ChamberWidth = 20*cm;
117 ChamberSpacing = 80*cm;
118
119 fTrackerLength = (NbOfChambers+1)*ChamberSpacing; // Full length of Tracker
120 fTargetLength = 5.0 * cm; // Full length of Target
121
122 TargetMater = Pb;
123 ChamberMater = Xenon;
124
125 fWorldLength= 1.2 *(fTargetLength+fTrackerLength);
126
127 G4double targetSize = 0.5*fTargetLength; // Half length of the Target
128 G4double trackerSize = 0.5*fTrackerLength; // Half length of the Tracker
129
130//--------- Definitions of Solids, Logical Volumes, Physical Volumes ---------
131
132 //------------------------------
133 // World
134 //------------------------------
135
136 G4double HalfWorldLength = 0.5*fWorldLength;
137
138 G4GeometryManager::GetInstance()->SetWorldMaximumExtent(fWorldLength);
139 G4cout << "Computed tolerance = "
140 << G4GeometryTolerance::GetInstance()->GetSurfaceTolerance()/mm
141 << " mm" << G4endl;
142
143 solidWorld= new G4Box("world",HalfWorldLength,HalfWorldLength,HalfWorldLength);
144 logicWorld= new G4LogicalVolume( solidWorld, Air, "World", 0, 0, 0);
145
146 // Must place the World Physical volume unrotated at (0,0,0).
147 //
148 physiWorld = new G4PVPlacement(0, // no rotation
149 G4ThreeVector(), // at (0,0,0)
150 logicWorld, // its logical volume
151 "World", // its name
152 0, // its mother volume
153 false, // no boolean operations
154 0); // copy number
155
156 //------------------------------
157 // Target
158 //------------------------------
159
160 G4ThreeVector positionTarget = G4ThreeVector(0,0,-(targetSize+trackerSize));
161
162 solidTarget = new G4Box("target",targetSize,targetSize,targetSize);
163 logicTarget = new G4LogicalVolume(solidTarget,TargetMater,"Target",0,0,0);
164 physiTarget = new G4PVPlacement(0, // no rotation
165 positionTarget, // at (x,y,z)
166 logicTarget, // its logical volume
167 "Target", // its name
168 logicWorld, // its mother volume
169 false, // no boolean operations
170 0); // copy number
171
172 G4cout << "Target is " << fTargetLength/cm << " cm of "
173 << TargetMater->GetName() << G4endl;
174
175 //------------------------------
176 // Tracker
177 //------------------------------
178
179 G4ThreeVector positionTracker = G4ThreeVector(0,0,0);
180
181 solidTracker = new G4Box("tracker",trackerSize,trackerSize,trackerSize);
182 logicTracker = new G4LogicalVolume(solidTracker , Air, "Tracker",0,0,0);
183 physiTracker = new G4PVPlacement(0, // no rotation
184 positionTracker, // at (x,y,z)
185 logicTracker, // its logical volume
186 "Tracker", // its name
187 logicWorld, // its mother volume
188 false, // no boolean operations
189 0); // copy number
190
191 //------------------------------
192 // Tracker segments
193 //------------------------------
194 //
195 // An example of Parameterised volumes
196 // dummy values for G4Box -- modified by parameterised volume
197
198 solidChamber = new G4Box("chamber", 100*cm, 100*cm, 10*cm);
199 logicChamber = new G4LogicalVolume(solidChamber,ChamberMater,"Chamber",0,0,0);
200
201 G4double firstPosition = -trackerSize + 0.5*ChamberWidth;
202 G4double firstLength = fTrackerLength/10;
203 G4double lastLength = fTrackerLength;
204
205 chamberParam = new ExN02ChamberParameterisation(
206 NbOfChambers, // NoChambers
207 firstPosition, // Z of center of first
208 ChamberSpacing, // Z spacing of centers
209 ChamberWidth, // Width Chamber
210 firstLength, // lengthInitial
211 lastLength); // lengthFinal
212
213 // dummy value : kZAxis -- modified by parameterised volume
214 //
215 physiChamber = new G4PVParameterised(
216 "Chamber", // their name
217 logicChamber, // their logical volume
218 logicTracker, // Mother logical volume
219 kZAxis, // Are placed along this axis
220 NbOfChambers, // Number of chambers
221 chamberParam); // The parametrisation
222
223 G4cout << "There are " << NbOfChambers << " chambers in the tracker region. "
224 << "The chambers are " << ChamberWidth/mm << " mm of "
225 << ChamberMater->GetName() << "\n The distance between chamber is "
226 << ChamberSpacing/cm << " cm" << G4endl;
227
228 //------------------------------------------------
229 // Sensitive detectors
230 //------------------------------------------------
231
232 G4SDManager* SDman = G4SDManager::GetSDMpointer();
233
234 G4String trackerChamberSDname = "ExN02/TrackerChamberSD";
235 ExN02TrackerSD* aTrackerSD = new ExN02TrackerSD( trackerChamberSDname );
236 SDman->AddNewDetector( aTrackerSD );
237 logicChamber->SetSensitiveDetector( aTrackerSD );
238
239//--------- Visualization attributes -------------------------------
240
241 G4VisAttributes* BoxVisAtt= new G4VisAttributes(G4Colour(1.0,1.0,1.0));
242 logicWorld ->SetVisAttributes(BoxVisAtt);
243 logicTarget ->SetVisAttributes(BoxVisAtt);
244 logicTracker->SetVisAttributes(BoxVisAtt);
245
246 G4VisAttributes* ChamberVisAtt = new G4VisAttributes(G4Colour(1.0,1.0,0.0));
247 logicChamber->SetVisAttributes(ChamberVisAtt);
248
249//--------- example of User Limits -------------------------------
250
251 // below is an example of how to set tracking constraints in a given
252 // logical volume(see also in N02PhysicsList how to setup the processes
253 // G4StepLimiter or G4UserSpecialCuts).
254
255 // Sets a max Step length in the tracker region, with G4StepLimiter
256 //
257 G4double maxStep = 0.5*ChamberWidth;
258 stepLimit = new G4UserLimits(maxStep);
259 logicTracker->SetUserLimits(stepLimit);
260
261 // Set additional contraints on the track, with G4UserSpecialCuts
262 //
263 // G4double maxLength = 2*fTrackerLength, maxTime = 0.1*ns, minEkin = 10*MeV;
264 // logicTracker->SetUserLimits(new G4UserLimits(maxStep,maxLength,maxTime,
265 // minEkin));
266
267 return physiWorld;
268}
269
270//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
271
272void ExN02DetectorConstruction::setTargetMaterial(G4String materialName)
273{
274 // search the material by its name
275 G4Material* pttoMaterial = G4Material::GetMaterial(materialName);
276 if (pttoMaterial)
277 {TargetMater = pttoMaterial;
278 logicTarget->SetMaterial(pttoMaterial);
279 G4cout << "\n----> The target is " << fTargetLength/cm << " cm of "
280 << materialName << G4endl;
281 }
282}
283
284//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
285
286void ExN02DetectorConstruction::setChamberMaterial(G4String materialName)
287{
288 // search the material by its name
289 G4Material* pttoMaterial = G4Material::GetMaterial(materialName);
290 if (pttoMaterial)
291 {ChamberMater = pttoMaterial;
292 logicChamber->SetMaterial(pttoMaterial);
293 G4cout << "\n----> The chambers are " << ChamberWidth/cm << " cm of "
294 << materialName << G4endl;
295 }
296}
297
298//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
299
300void ExN02DetectorConstruction::SetMagField(G4double fieldValue)
301{
302 fpMagField->SetFieldValue(fieldValue);
303}
304
305//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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