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25 //
26 /// \file GB06/src/GB06ParallelWorldForSlices.cc
27 /// \brief Implementation of the GB06ParallelWorldForSlices class
28 //
29 //
30 #include "GB06ParallelWorldForSlices.hh"
31
32 #include "GB06BOptrSplitAndKillByImportance.hh"
33
34 #include "G4Box.hh"
35 #include "G4LogicalVolume.hh"
36 #include "G4LogicalVolumeStore.hh"
37 #include "G4PVPlacement.hh"
38 #include "G4PVReplica.hh"
39 #include "G4PhysicalVolumeStore.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "G4ThreeVector.hh"
42
43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44
45 GB06ParallelWorldForSlices::GB06ParallelWorldForSlices(G4String worldName)
46 : G4VUserParallelWorld(worldName)
47 {
48 ;
49 }
50
51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
52
53 GB06ParallelWorldForSlices::~GB06ParallelWorldForSlices()
54 {
55 ;
56 }
57
58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59
60 void GB06ParallelWorldForSlices::Construct()
61 {
62 // -- Inform about construction:
63 // -- (fWorldName is a protected data member of the base parallel world class)
64 G4cout << "Parallel World `" << fWorldName << "' constructed." << G4endl;
65
66 // -------------------------
67 // Build parallel geometry:
68 // -------------------------
69
70 // -- Obtain clone of mass geometry world from GetWorld() base class utility:
71 G4VPhysicalVolume* physicalParallelWorld = GetWorld();
72 G4LogicalVolume* logicalParallelWorld = physicalParallelWorld->GetLogicalVolume();
73
74 // -- We overlay a sliced geometry on top of the block of concrete in the mass geometry
75 // -- (ie, in the detector construction class), using the same dimensions.
76 // -- [Note that this is a choice : we can use different dimensions and shapes, creating
77 // -- a new solid for that.]
78 // -- For this we:
79 // -- - 1) get back the solid used to create the concrete shield;
80 // -- - 2) create a new logical volume of same shape than the shield and we place
81 // -- inside the slices
82 // -- - 3) place the sliced structure, using the placement of the physical volume of
83 // -- the concrete shield
84 // -- In all this construction, no materials are used, as only the volumes boundaries
85 // -- are of interest. Note that the absence of materials is only possible in parallel
86 // -- geometries.
87
88 // -- 1) get back the solid used to create the concrete shield:
89 // ------------------------------------------------------
90
91 // -- get back the logical volume of the shield, using its name:
92 G4LogicalVolume* shieldLogical = G4LogicalVolumeStore::GetInstance()->GetVolume("shield.logical");
93
94 // -- get back the solid, a G4box in this case. We cast the pointer to access later on
95 // -- the G4Box class specific methods:
96 auto shieldSolid = (G4Box*)shieldLogical->GetSolid();
97
98 // -- we now re-create a logical volume for the mother volume of the slices:
99 G4LogicalVolume* motherForSlicesLogical =
100 new G4LogicalVolume(shieldSolid, // its solid
101 nullptr, // no material
102 "motherForSlices.logical"); // its name
103
104 // -- 2) new logical volume of same shape than the shield and place inside the slices:
105 // -----------------------------------------------------------------------------
106
107 // -- We create now the slices; we choose 20 slices:
108 const G4int nSlices(20);
109 // -- the solid for slices:
110 G4double halfSliceZ = shieldSolid->GetZHalfLength() / nSlices;
111 G4Box* sliceSolid = new G4Box("slice.solid", shieldSolid->GetXHalfLength(),
112 shieldSolid->GetYHalfLength(), halfSliceZ);
113
114 // -- the logical volume for slices:
115 sliceLogical = new G4LogicalVolume(sliceSolid, // its solid
116 nullptr, // no material
117 "slice.logical"); // its name
118
119 // -- we use a replica, to place the 20 slices in one go, along the Z axis:
120 slicePhysical = new G4PVReplica("slice.physical", // its name
121 sliceLogical, // its logical volume
122 motherForSlicesLogical, // its mother volume
123 kZAxis, // axis of replication
124 nSlices, // number of replica
125 2 * halfSliceZ); // width of replica
126
127 // -- 3) place the sliced structure, using the concrete shield placement:
128 // ----------------------------------------------------------------
129
130 // -- get back the physical volume of the shield, using its name:
131 // -- (note that we know we have only one physical volume with this name. If we had
132 // -- several, we should loop by ourselves on the store which is of
133 // -- std::vector<G4VPhysicalVolume*> type.)
134 G4VPhysicalVolume* shieldPhysical =
135 G4PhysicalVolumeStore::GetInstance()->GetVolume("shield.physical");
136
137 // -- get back the translation
138 // -- (we don't try to get back the rotation, we know we used nullptr):
139 G4ThreeVector translation = shieldPhysical->GetObjectTranslation();
140
141 // -- finally, we place the sliced structure:
142 new G4PVPlacement(nullptr, // no rotation
143 translation, // translate as for the shield
144 motherForSlicesLogical, // its logical volume
145 "motherForSlices.physical", // its name
146 logicalParallelWorld, // its mother volume
147 false, // no boolean operation
148 0); // copy number
149 }
150
151 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
152
153 void GB06ParallelWorldForSlices::ConstructSD()
154 {
155 // -- Create the biasing operator:
156 auto biasingOperator = new GB06BOptrSplitAndKillByImportance("neutron", "parallelOptr");
157 // -- Tell it it is active for this parallel geometry, passing the world
158 // -- volume of this geometry :
159 biasingOperator->SetParallelWorld(GetWorld());
160
161 // -- Attach to the logical volume where the biasing has to be applied:
162 biasingOperator->AttachTo(sliceLogical);
163
164 // -- Create a simple "volume importance" map, linking replica numbers to importances:
165 // --------------------------------------------------------------------------------
166 // -- we define the map as going from an importance to 2*importance when going from
167 // -- a slice to the next one, in the Z direction.
168 // -- Get back the replica of slices:
169 G4int nReplica = slicePhysical->GetMultiplicity();
170 // -- We use and fill the map we defined in the biasing operator:
171 G4int importance = 1;
172 for (G4int iReplica = 0; iReplica < nReplica; ++iReplica) {
173 (biasingOperator->GetImportanceMap())[iReplica] = importance;
174 importance *= 2;
175 }
176 }
177