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26 //
27 /// \file B2/B2b/src/DetectorConstruction.cc
28 /// \brief Implementation of the B2b::Detector
29
30 #include "DetectorConstruction.hh"
31
32 #include "ChamberParameterisation.hh"
33 #include "DetectorMessenger.hh"
34 #include "TrackerSD.hh"
35
36 #include "G4AutoDelete.hh"
37 #include "G4Box.hh"
38 #include "G4Colour.hh"
39 #include "G4GeometryManager.hh"
40 #include "G4GeometryTolerance.hh"
41 #include "G4GlobalMagFieldMessenger.hh"
42 #include "G4LogicalVolume.hh"
43 #include "G4Material.hh"
44 #include "G4NistManager.hh"
45 #include "G4PVParameterised.hh"
46 #include "G4PVPlacement.hh"
47 #include "G4SDManager.hh"
48 #include "G4SystemOfUnits.hh"
49 #include "G4ThreeVector.hh"
50 #include "G4Tubs.hh"
51 #include "G4UserLimits.hh"
52 #include "G4VisAttributes.hh"
53
54 using namespace B2;
55
56 namespace B2b
57 {
58
59 //....oooOO0OOooo........oooOO0OOooo........oo
60
61 G4ThreadLocal G4GlobalMagFieldMessenger* Detec
62
63 DetectorConstruction::DetectorConstruction()
64 {
65 fMessenger = new DetectorMessenger(this);
66 }
67
68 //....oooOO0OOooo........oooOO0OOooo........oo
69
70 DetectorConstruction::~DetectorConstruction()
71 {
72 delete fStepLimit;
73 delete fMessenger;
74 }
75
76 //....oooOO0OOooo........oooOO0OOooo........oo
77
78 G4VPhysicalVolume* DetectorConstruction::Const
79 {
80 // Define materials
81 DefineMaterials();
82
83 // Define volumes
84 return DefineVolumes();
85 }
86
87 //....oooOO0OOooo........oooOO0OOooo........oo
88
89 void DetectorConstruction::DefineMaterials()
90 {
91 // Material definition
92
93 G4NistManager* nistManager = G4NistManager::
94
95 // Air defined using NIST Manager
96 nistManager->FindOrBuildMaterial("G4_AIR");
97
98 // Lead defined using NIST Manager
99 fTargetMaterial = nistManager->FindOrBuildMa
100
101 // Xenon gas defined using NIST Manager
102 fChamberMaterial = nistManager->FindOrBuildM
103
104 // Print materials
105 G4cout << *(G4Material::GetMaterialTable())
106 }
107
108 //....oooOO0OOooo........oooOO0OOooo........oo
109
110 G4VPhysicalVolume* DetectorConstruction::Defin
111 {
112 G4Material* air = G4Material::GetMaterial("G
113
114 // Sizes of the principal geometrical compon
115
116 G4int NbOfChambers = 5;
117 G4double chamberSpacing = 80 * cm; // from
118
119 G4double chamberWidth = 20.0 * cm; // width
120 G4double targetLength = 5.0 * cm; // full l
121
122 G4double trackerLength = (NbOfChambers + 1)
123
124 G4double worldLength = 1.2 * (2 * targetLeng
125
126 G4double targetRadius = 0.5 * targetLength;
127 targetLength = 0.5 * targetLength; // Half
128 G4double trackerSize = 0.5 * trackerLength;
129
130 // Definitions of Solids, Logical Volumes, P
131
132 // World
133
134 G4GeometryManager::GetInstance()->SetWorldMa
135
136 G4cout << "Computed tolerance = "
137 << G4GeometryTolerance::GetInstance()
138
139 auto worldS = new G4Box("world", // its nam
140 worldLength / 2, wor
141 auto worldLV = new G4LogicalVolume(worldS,
142 air, //
143 "World");
144
145 // Must place the World Physical volume unr
146 //
147 auto worldPV = new G4PVPlacement(nullptr, /
148 G4ThreeVect
149 worldLV, /
150 "World", /
151 nullptr, /
152 false, //
153 0, // copy
154 fCheckOverl
155
156 // Target
157
158 G4ThreeVector positionTarget = G4ThreeVector
159
160 auto targetS = new G4Tubs("target", 0., targ
161 fLogicTarget = new G4LogicalVolume(targetS,
162 new G4PVPlacement(nullptr, // no rotation
163 positionTarget, // at (x,
164 fLogicTarget, // its logi
165 "Target", // its name
166 worldLV, // its mother vo
167 false, // no boolean oper
168 0, // copy number
169 fCheckOverlaps); // check
170
171 G4cout << "Target is " << 2 * targetLength /
172 << G4endl;
173
174 // Tracker
175
176 G4ThreeVector positionTracker = G4ThreeVecto
177
178 auto trackerS = new G4Tubs("tracker", 0, tra
179 auto trackerLV = new G4LogicalVolume(tracker
180 new G4PVPlacement(nullptr, // no rotation
181 positionTracker, // at (x
182 trackerLV, // its logical
183 "Tracker", // its name
184 worldLV, // its mother v
185 false, // no boolean oper
186 0, // copy number
187 fCheckOverlaps); // check
188
189 // Tracker segments
190
191 // An example of Parameterised volumes
192 // Dummy values for G4Tubs -- modified by pa
193
194 auto chamberS = new G4Tubs("tracker", 0, 100
195 fLogicChamber =
196 new G4LogicalVolume(chamberS, fChamberMate
197
198 G4double firstPosition = -trackerSize + cham
199 G4double firstLength = trackerLength / 10;
200 G4double lastLength = trackerLength;
201
202 G4VPVParameterisation* chamberParam =
203 new ChamberParameterisation(NbOfChambers,
204 firstPosition,
205 chamberSpacing
206 chamberWidth,
207 firstLength,
208 lastLength);
209
210 // dummy value : kZAxis -- modified by param
211
212 new G4PVParameterised("Chamber", // their n
213 fLogicChamber, // the
214 trackerLV, // Mother
215 kZAxis, // Are placed
216 NbOfChambers, // Numb
217 chamberParam, // The
218 fCheckOverlaps); // c
219
220 G4cout << "There are " << NbOfChambers << "
221 << "The chambers are " << chamberWidt
222 << G4endl << "The distance between ch
223
224 // Visualization attributes
225
226 G4VisAttributes boxVisAtt(G4Colour::White())
227
228 worldLV->SetVisAttributes(boxVisAtt);
229 fLogicTarget->SetVisAttributes(boxVisAtt);
230 trackerLV->SetVisAttributes(boxVisAtt);
231
232 G4VisAttributes chamberVisAtt(G4Colour::Yell
233 fLogicChamber->SetVisAttributes(chamberVisAt
234
235 // Example of User Limits
236 //
237 // Below is an example of how to set trackin
238 // logical volume
239 //
240 // Sets a max step length in the tracker reg
241
242 G4double maxStep = 0.5 * chamberWidth;
243 fStepLimit = new G4UserLimits(maxStep);
244 trackerLV->SetUserLimits(fStepLimit);
245
246 /// Set additional contraints on the track,
247 ///
248 /// G4double maxLength = 2*trackerLength, ma
249 /// trackerLV->SetUserLimits(new G4UserLimit
250 ///
251 ///
252 ///
253
254 // Always return the physical world
255
256 return worldPV;
257 }
258
259 //....oooOO0OOooo........oooOO0OOooo........oo
260
261 void DetectorConstruction::ConstructSDandField
262 {
263 // Sensitive detectors
264
265 G4String trackerChamberSDname = "B2/TrackerC
266 auto trackerSD = new TrackerSD(trackerChambe
267 G4SDManager::GetSDMpointer()->AddNewDetector
268 SetSensitiveDetector(fLogicChamber, trackerS
269
270 // Create global magnetic field messenger.
271 // Uniform magnetic field is then created au
272 // the field value is not zero.
273 G4ThreeVector fieldValue = G4ThreeVector();
274 fMagFieldMessenger = new G4GlobalMagFieldMes
275 fMagFieldMessenger->SetVerboseLevel(1);
276
277 // Register the field messenger for deleting
278 G4AutoDelete::Register(fMagFieldMessenger);
279 }
280
281 //....oooOO0OOooo........oooOO0OOooo........oo
282
283 void DetectorConstruction::SetTargetMaterial(G
284 {
285 G4NistManager* nistManager = G4NistManager::
286
287 G4Material* pttoMaterial = nistManager->Find
288
289 if (fTargetMaterial != pttoMaterial) {
290 if (pttoMaterial) {
291 fTargetMaterial = pttoMaterial;
292 if (fLogicTarget) fLogicTarget->SetMater
293 G4cout << G4endl << "----> The target is
294 }
295 else {
296 G4cout << G4endl << "--> WARNING from S
297 << G4endl;
298 }
299 }
300 }
301
302 //....oooOO0OOooo........oooOO0OOooo........oo
303
304 void DetectorConstruction::SetChamberMaterial(
305 {
306 G4NistManager* nistManager = G4NistManager::
307
308 G4Material* pttoMaterial = nistManager->Find
309
310 if (fChamberMaterial != pttoMaterial) {
311 if (pttoMaterial) {
312 fChamberMaterial = pttoMaterial;
313 if (fLogicChamber) fLogicChamber->SetMat
314 G4cout << G4endl << "----> The chambers
315 }
316 else {
317 G4cout << G4endl << "--> WARNING from S
318 << G4endl;
319 }
320 }
321 }
322
323 //....oooOO0OOooo........oooOO0OOooo........oo
324
325 void DetectorConstruction::SetMaxStep(G4double
326 {
327 if ((fStepLimit) && (maxStep > 0.)) fStepLim
328 }
329
330 //....oooOO0OOooo........oooOO0OOooo........oo
331
332 } // namespace B2b
333