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ExN02DetectorConstruction.cc
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27 // $Id: ExN02DetectorConstruction.cc 69899 2013-05-17 10:05:33Z gcosmo $
28 //
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31 
32 #include "ExN02DetectorConstruction.hh"
33 #include "ExN02DetectorMessenger.hh"
34 #include "ExN02ChamberParameterisation.hh"
35 #include "ExN02MagneticField.hh"
36 #include "ExN02TrackerSD.hh"
37 
38 #include "G4Material.hh"
39 #include "G4Box.hh"
40 #include "G4LogicalVolume.hh"
41 #include "G4PVPlacement.hh"
42 #include "G4PVParameterised.hh"
43 #include "G4SDManager.hh"
44 #include "G4GeometryTolerance.hh"
45 #include "G4GeometryManager.hh"
46 
47 #include "G4UserLimits.hh"
48 
49 #include "G4VisAttributes.hh"
50 #include "G4Colour.hh"
51 
52 #include "G4SystemOfUnits.hh"
53 #include "G4ios.hh"
54 
55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56 
57 ExN02DetectorConstruction::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 
73 ExN02DetectorConstruction::~ExN02DetectorConstruction()
74 {
75  delete fpMagField;
76  delete stepLimit;
77  delete chamberParam;
78  delete detectorMessenger;
79 }
80 
81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
82 
83 G4VPhysicalVolume* 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 
272 void 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 
286 void 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 
300 void ExN02DetectorConstruction::SetMagField(G4double fieldValue)
301 {
302  fpMagField->SetMagFieldValue(fieldValue);
303 }
304 
305 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
306 
307 void ExN02DetectorConstruction::SetMaxStep(G4double maxStep)
308 {
309  if ((stepLimit)&&(maxStep>0.)) stepLimit->SetMaxAllowedStep(maxStep);
310 }
311 
312 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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