B2a/src/DetectorConstruction.cc

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0026 //
0027 /// \file B2/B2a/src/DetectorConstruction.cc
0028 /// \brief Implementation of the B2a::DetectorConstruction class
0029
0030 #include "DetectorConstruction.hh"
0031
0032 #include "DetectorMessenger.hh"
0033 #include "TrackerSD.hh"
0034
0035 #include "G4AutoDelete.hh"
0036 #include "G4Box.hh"
0037 #include "G4Colour.hh"
0038 #include "G4GeometryManager.hh"
0039 #include "G4GeometryTolerance.hh"
0040 #include "G4GlobalMagFieldMessenger.hh"
0041 #include "G4LogicalVolume.hh"
0042 #include "G4Material.hh"
0043 #include "G4NistManager.hh"
0044 #include "G4PVPlacement.hh"
0045 #include "G4SDManager.hh"
0046 #include "G4SystemOfUnits.hh"
0047 #include "G4Tubs.hh"
0048 #include "G4UserLimits.hh"
0049 #include "G4VisAttributes.hh"
0050
0051 using namespace B2;
0052
0053 namespace B2a
0054 {
0055
0056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0057
0058 G4ThreadLocal G4GlobalMagFieldMessenger* DetectorConstruction::fMagFieldMessenger = nullptr;
0059
0060 DetectorConstruction::DetectorConstruction()
0061 {
0062   fMessenger = new DetectorMessenger(this);
0063
0064   fNbOfChambers = 5;
0065   fLogicChamber = new G4LogicalVolume*[fNbOfChambers];
0066 }
0067
0068 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0069
0070 DetectorConstruction::~DetectorConstruction()
0071 {
0072   delete[] fLogicChamber;
0073   delete fStepLimit;
0074   delete fMessenger;
0075 }
0076
0077 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0078
0079 G4VPhysicalVolume* DetectorConstruction::Construct()
0080 {
0081   // Define materials
0082   DefineMaterials();
0083
0084   // Define volumes
0085   return DefineVolumes();
0086 }
0087
0088 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0089
0090 void DetectorConstruction::DefineMaterials()
0091 {
0092   // Material definition
0093
0094   G4NistManager* nistManager = G4NistManager::Instance();
0095
0096   // Air defined using NIST Manager
0097   nistManager->FindOrBuildMaterial("G4_AIR");
0098
0099   // Lead defined using NIST Manager
0100   fTargetMaterial = nistManager->FindOrBuildMaterial("G4_Pb");
0101
0102   // Xenon gas defined using NIST Manager
0103   fChamberMaterial = nistManager->FindOrBuildMaterial("G4_Xe");
0104
0105   // Print materials
0106   G4cout << *(G4Material::GetMaterialTable()) << G4endl;
0107 }
0108
0109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0110
0111 G4VPhysicalVolume* DetectorConstruction::DefineVolumes()
0112 {
0113   G4Material* air = G4Material::GetMaterial("G4_AIR");
0114
0115   // Sizes of the principal geometrical components (solids)
0116
0117   G4double chamberSpacing = 80 * cm;  // from chamber center to center!
0118
0119   G4double chamberWidth = 20.0 * cm;  // width of the chambers
0120   G4double targetLength = 5.0 * cm;  // full length of Target
0121
0122   G4double trackerLength = (fNbOfChambers + 1) * chamberSpacing;
0123
0124   G4double worldLength = 1.2 * (2 * targetLength + trackerLength);
0125
0126   G4double targetRadius = 0.5 * targetLength;  // Radius of Target
0127   targetLength = 0.5 * targetLength;  // Half length of the Target
0128   G4double trackerSize = 0.5 * trackerLength;  // Half length of the Tracker
0129
0130   // Definitions of Solids, Logical Volumes, Physical Volumes
0131
0132   // World
0133
0134   G4GeometryManager::GetInstance()->SetWorldMaximumExtent(worldLength);
0135
0136   G4cout << "Computed tolerance = "
0137          << G4GeometryTolerance::GetInstance()->GetSurfaceTolerance() / mm << " mm" << G4endl;
0138
0139   auto worldS = new G4Box("world",  // its name
0140                           worldLength / 2, worldLength / 2, worldLength / 2);  // its size
0141   auto worldLV = new G4LogicalVolume(worldS,  // its solid
0142                                      air,  // its material
0143                                      "World");  // its name
0144
0145   //  Must place the World Physical volume unrotated at (0,0,0).
0146   //
0147   auto worldPV = new G4PVPlacement(nullptr,  // no rotation
0148                                    G4ThreeVector(),  // at (0,0,0)
0149                                    worldLV,  // its logical volume
0150                                    "World",  // its name
0151                                    nullptr,  // its mother  volume
0152                                    false,  // no boolean operations
0153                                    0,  // copy number
0154                                    fCheckOverlaps);  // checking overlaps
0155
0156   // Target
0157
0158   G4ThreeVector positionTarget = G4ThreeVector(0, 0, -(targetLength + trackerSize));
0159
0160   auto targetS = new G4Tubs("target", 0., targetRadius, targetLength, 0. * deg, 360. * deg);
0161   fLogicTarget = new G4LogicalVolume(targetS, fTargetMaterial, "Target", nullptr, nullptr, nullptr);
0162   new G4PVPlacement(nullptr,  // no rotation
0163                     positionTarget,  // at (x,y,z)
0164                     fLogicTarget,  // its logical volume
0165                     "Target",  // its name
0166                     worldLV,  // its mother volume
0167                     false,  // no boolean operations
0168                     0,  // copy number
0169                     fCheckOverlaps);  // checking overlaps
0170
0171   G4cout << "Target is " << 2 * targetLength / cm << " cm of " << fTargetMaterial->GetName()
0172          << G4endl;
0173
0174   // Tracker
0175
0176   G4ThreeVector positionTracker = G4ThreeVector(0, 0, 0);
0177
0178   auto trackerS = new G4Tubs("tracker", 0, trackerSize, trackerSize, 0. * deg, 360. * deg);
0179   auto trackerLV = new G4LogicalVolume(trackerS, air, "Tracker", nullptr, nullptr, nullptr);
0180   new G4PVPlacement(nullptr,  // no rotation
0181                     positionTracker,  // at (x,y,z)
0182                     trackerLV,  // its logical volume
0183                     "Tracker",  // its name
0184                     worldLV,  // its mother  volume
0185                     false,  // no boolean operations
0186                     0,  // copy number
0187                     fCheckOverlaps);  // checking overlaps
0188
0189   // Visualization attributes
0190
0191   G4VisAttributes boxVisAtt(G4Colour::White());
0192   G4VisAttributes chamberVisAtt(G4Colour::Yellow());
0193
0194   worldLV->SetVisAttributes(boxVisAtt);
0195   fLogicTarget->SetVisAttributes(boxVisAtt);
0196   trackerLV->SetVisAttributes(boxVisAtt);
0197
0198   // Tracker segments
0199
0200   G4cout << "There are " << fNbOfChambers << " chambers in the tracker region. " << G4endl
0201          << "The chambers are " << chamberWidth / cm << " cm of " << fChamberMaterial->GetName()
0202          << G4endl << "The distance between chamber is " << chamberSpacing / cm << " cm" << G4endl;
0203
0204   G4double firstPosition = -trackerSize + chamberSpacing;
0205   G4double firstLength = trackerLength / 10;
0206   G4double lastLength = trackerLength;
0207
0208   G4double halfWidth = 0.5 * chamberWidth;
0209   G4double rmaxFirst = 0.5 * firstLength;
0210
0211   G4double rmaxIncr = 0.0;
0212   if (fNbOfChambers > 0) {
0213     rmaxIncr = 0.5 * (lastLength - firstLength) / (fNbOfChambers - 1);
0214     if (chamberSpacing < chamberWidth) {
0215       G4Exception("DetectorConstruction::DefineVolumes()", "InvalidSetup", FatalException,
0216                   "Width>Spacing");
0217     }
0218   }
0219
0220   for (G4int copyNo = 0; copyNo < fNbOfChambers; copyNo++) {
0221     G4double Zposition = firstPosition + copyNo * chamberSpacing;
0222     G4double rmax = rmaxFirst + copyNo * rmaxIncr;
0223
0224     auto chamberS = new G4Tubs("Chamber_solid", 0, rmax, halfWidth, 0. * deg, 360. * deg);
0225
0226     fLogicChamber[copyNo] =
0227       new G4LogicalVolume(chamberS, fChamberMaterial, "Chamber_LV", nullptr, nullptr, nullptr);
0228
0229     fLogicChamber[copyNo]->SetVisAttributes(chamberVisAtt);
0230
0231     new G4PVPlacement(nullptr,  // no rotation
0232                       G4ThreeVector(0, 0, Zposition),  // at (x,y,z)
0233                       fLogicChamber[copyNo],  // its logical volume
0234                       "Chamber_PV",  // its name
0235                       trackerLV,  // its mother  volume
0236                       false,  // no boolean operations
0237                       copyNo,  // copy number
0238                       fCheckOverlaps);  // checking overlaps
0239   }
0240
0241   // Example of User Limits
0242   //
0243   // Below is an example of how to set tracking constraints in a given
0244   // logical volume
0245   //
0246   // Sets a max step length in the tracker region, with G4StepLimiter
0247
0248   G4double maxStep = 0.5 * chamberWidth;
0249   fStepLimit = new G4UserLimits(maxStep);
0250   trackerLV->SetUserLimits(fStepLimit);
0251
0252   /// Set additional contraints on the track, with G4UserSpecialCuts
0253   ///
0254   /// G4double maxLength = 2*trackerLength, maxTime = 0.1*ns, minEkin = 10*MeV;
0255   /// trackerLV->SetUserLimits(new G4UserLimits(maxStep,
0256   ///                                           maxLength,
0257   ///                                           maxTime,
0258   ///                                           minEkin));
0259
0260   // Always return the physical world
0261
0262   return worldPV;
0263 }
0264
0265 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0266
0267 void DetectorConstruction::ConstructSDandField()
0268 {
0269   // Sensitive detectors
0270
0271   G4String trackerChamberSDname = "/TrackerChamberSD";
0272   auto trackerSD = new TrackerSD(trackerChamberSDname, "TrackerHitsCollection");
0273   G4SDManager::GetSDMpointer()->AddNewDetector(trackerSD);
0274   // Setting trackerSD to all logical volumes with the same name
0275   // of "Chamber_LV".
0276   SetSensitiveDetector("Chamber_LV", trackerSD, true);
0277
0278   // Create global magnetic field messenger.
0279   // Uniform magnetic field is then created automatically if
0280   // the field value is not zero.
0281   G4ThreeVector fieldValue = G4ThreeVector();
0282   fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
0283   fMagFieldMessenger->SetVerboseLevel(1);
0284
0285   // Register the field messenger for deleting
0286   G4AutoDelete::Register(fMagFieldMessenger);
0287 }
0288
0289 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0290
0291 void DetectorConstruction::SetTargetMaterial(G4String materialName)
0292 {
0293   G4NistManager* nistManager = G4NistManager::Instance();
0294
0295   G4Material* pttoMaterial = nistManager->FindOrBuildMaterial(materialName);
0296
0297   if (fTargetMaterial != pttoMaterial) {
0298     if (pttoMaterial) {
0299       fTargetMaterial = pttoMaterial;
0300       if (fLogicTarget) fLogicTarget->SetMaterial(fTargetMaterial);
0301       G4cout << G4endl << "----> The target is made of " << materialName << G4endl;
0302     }
0303     else {
0304       G4cout << G4endl << "-->  WARNING from SetTargetMaterial : " << materialName << " not found"
0305              << G4endl;
0306     }
0307   }
0308 }
0309
0310 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0311
0312 void DetectorConstruction::SetChamberMaterial(G4String materialName)
0313 {
0314   G4NistManager* nistManager = G4NistManager::Instance();
0315
0316   G4Material* pttoMaterial = nistManager->FindOrBuildMaterial(materialName);
0317
0318   if (fChamberMaterial != pttoMaterial) {
0319     if (pttoMaterial) {
0320       fChamberMaterial = pttoMaterial;
0321       for (G4int copyNo = 0; copyNo < fNbOfChambers; copyNo++) {
0322         if (fLogicChamber[copyNo]) fLogicChamber[copyNo]->SetMaterial(fChamberMaterial);
0323       }
0324       G4cout << G4endl << "----> The chambers are made of " << materialName << G4endl;
0325     }
0326     else {
0327       G4cout << G4endl << "-->  WARNING from SetChamberMaterial : " << materialName << " not found"
0328              << G4endl;
0329     }
0330   }
0331 }
0332
0333 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0334
0335 void DetectorConstruction::SetMaxStep(G4double maxStep)
0336 {
0337   if ((fStepLimit) && (maxStep > 0.)) fStepLimit->SetMaxAllowedStep(maxStep);
0338 }
0339
0340 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0341
0342 void DetectorConstruction::SetCheckOverlaps(G4bool checkOverlaps)
0343 {
0344   fCheckOverlaps = checkOverlaps;
0345 }
0346
0347 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0348
0349 }  // namespace B2a