GB06/src/GB06ParallelWorldForSlices.cc

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0026 /// \file GB06/src/GB06ParallelWorldForSlices.cc
0027 /// \brief Implementation of the GB06ParallelWorldForSlices class
0028 //
0029 //
0030 #include "GB06ParallelWorldForSlices.hh"
0031
0032 #include "GB06BOptrSplitAndKillByImportance.hh"
0033
0034 #include "G4Box.hh"
0035 #include "G4LogicalVolume.hh"
0036 #include "G4LogicalVolumeStore.hh"
0037 #include "G4PVPlacement.hh"
0038 #include "G4PVReplica.hh"
0039 #include "G4PhysicalVolumeStore.hh"
0040 #include "G4SystemOfUnits.hh"
0041 #include "G4ThreeVector.hh"
0042
0043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0044
0045 GB06ParallelWorldForSlices::GB06ParallelWorldForSlices(G4String worldName)
0046   : G4VUserParallelWorld(worldName)
0047 {
0048   ;
0049 }
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0052
0053 GB06ParallelWorldForSlices::~GB06ParallelWorldForSlices()
0054 {
0055   ;
0056 }
0057
0058 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0059
0060 void GB06ParallelWorldForSlices::Construct()
0061 {
0062   // -- Inform about construction:
0063   // -- (fWorldName is a protected data member of the base parallel world class)
0064   G4cout << "Parallel World `" << fWorldName << "' constructed." << G4endl;
0065
0066   // -------------------------
0067   //  Build parallel geometry:
0068   // -------------------------
0069
0070   // -- Obtain clone of mass geometry world from GetWorld() base class utility:
0071   G4VPhysicalVolume* physicalParallelWorld = GetWorld();
0072   G4LogicalVolume* logicalParallelWorld = physicalParallelWorld->GetLogicalVolume();
0073
0074   // -- We overlay a sliced geometry on top of the block of concrete in the mass geometry
0075   // -- (ie, in the detector construction class), using the same dimensions.
0076   // -- [Note that this is a choice : we can use different dimensions and shapes, creating
0077   // -- a new solid for that.]
0078   // -- For this we:
0079   // --     - 1) get back the solid used to create the concrete shield;
0080   // --     - 2) create a new logical volume of same shape than the shield and we place
0081   // --          inside the slices
0082   // --     - 3) place the sliced structure, using the placement of the physical volume of
0083   // --          the concrete shield
0084   // -- In all this construction, no materials are used, as only the volumes boundaries
0085   // -- are of interest. Note that the absence of materials is only possible in parallel
0086   // -- geometries.
0087
0088   // -- 1) get back the solid used to create the concrete shield:
0089   //       ------------------------------------------------------
0090
0091   // -- get back the logical volume of the shield, using its name:
0092   G4LogicalVolume* shieldLogical = G4LogicalVolumeStore::GetInstance()->GetVolume("shield.logical");
0093
0094   // -- get back the solid, a G4box in this case. We cast the pointer to access later on
0095   // -- the G4Box class specific methods:
0096   G4Box* shieldSolid = (G4Box*)shieldLogical->GetSolid();
0097
0098   // -- we now re-create a logical volume for the mother volume of the slices:
0099   G4LogicalVolume* motherForSlicesLogical =
0100     new G4LogicalVolume(shieldSolid,  // its solid
0101                         nullptr,  // no material
0102                         "motherForSlices.logical");  // its name
0103
0104   // -- 2) new logical volume of same shape than the shield and place inside the slices:
0105   //       -----------------------------------------------------------------------------
0106
0107   // -- We create now the slices; we choose 20 slices:
0108   const G4int nSlices(20);
0109   // -- the solid for slices:
0110   G4double halfSliceZ = shieldSolid->GetZHalfLength() / nSlices;
0111   G4Box* sliceSolid = new G4Box("slice.solid", shieldSolid->GetXHalfLength(),
0112                                 shieldSolid->GetYHalfLength(), halfSliceZ);
0113
0114   // -- the logical volume for slices:
0115   G4LogicalVolume* sliceLogical = new G4LogicalVolume(sliceSolid,  // its solid
0116                                                       nullptr,  // no material
0117                                                       "slice.logical");  // its name
0118
0119   // -- we use a replica, to place the 20 slices in one go, along the Z axis:
0120   new G4PVReplica("slice.physical",  // its name
0121                   sliceLogical,  // its logical volume
0122                   motherForSlicesLogical,  // its mother volume
0123                   kZAxis,  // axis of replication
0124                   nSlices,  // number of replica
0125                   2 * halfSliceZ);  // width of replica
0126
0127   // -- 3) place the sliced structure, using the concrete shield placement:
0128   //       ----------------------------------------------------------------
0129
0130   // -- get back the physical volume of the shield, using its name:
0131   // -- (note that we know we have only one physical volume with this name. If we had
0132   // -- several, we should loop by ourselves on the store which is of
0133   // -- std::vector<G4VPhysicalVolume*> type.)
0134   G4VPhysicalVolume* shieldPhysical =
0135     G4PhysicalVolumeStore::GetInstance()->GetVolume("shield.physical");
0136
0137   // -- get back the translation
0138   // -- (we don't try to get back the rotation, we know we used nullptr):
0139   G4ThreeVector translation = shieldPhysical->GetObjectTranslation();
0140
0141   // -- finally, we place the sliced structure:
0142   new G4PVPlacement(nullptr,  // no rotation
0143                     translation,  // translate as for the shield
0144                     motherForSlicesLogical,  // its logical volume
0145                     "motherForSlices.physical",  // its name
0146                     logicalParallelWorld,  // its mother  volume
0147                     false,  // no boolean operation
0148                     0);  // copy number
0149 }
0150
0151 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0152
0153 void GB06ParallelWorldForSlices::ConstructSD()
0154 {
0155   // -- Create the biasing operator:
0156   auto biasingOperator = new GB06BOptrSplitAndKillByImportance("neutron", "parallelOptr");
0157   // -- Tell it it is active for this parallel geometry, passing the world
0158   // -- volume of this geometry :
0159   biasingOperator->SetParallelWorld(GetWorld());
0160
0161   // -- Attach to the logical volume where the biasing has to be applied:
0162   auto slice = G4LogicalVolumeStore::GetInstance()->GetVolume("slice.logical");
0163   biasingOperator->AttachTo(slice);
0164
0165   // -- Create a simple "volume importance" map, linking replica numbers to importances:
0166   //    --------------------------------------------------------------------------------
0167   // -- we define the map as going from an importance to 2*importance when going from
0168   // -- a slice to the next one, in the Z direction.
0169   // -- Get back the replica of slices:
0170   G4PVReplica* slicePhysical =
0171     (G4PVReplica*)(G4PhysicalVolumeStore::GetInstance()->GetVolume("slice.physical"));
0172   G4int nReplica = slicePhysical->GetMultiplicity();
0173   // -- We use and fill the map we defined in the biasing operator:
0174   G4int importance = 1;
0175   for (G4int iReplica = 0; iReplica < nReplica; iReplica++) {
0176     (biasingOperator->GetImportanceMap())[iReplica] = importance;
0177     importance *= 2;
0178   }
0179 }