| Geant4 Cross Reference |
1 //
2 // ********************************************************************
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4 // * *
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17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
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24 // ********************************************************************
25 //
26 // Please cite the following paper if you use this software
27 // Nucl.Instrum.Meth.B260:20-27, 2007
28 //
29 // Based on purging magnet advanced example.
30 //
31
32 #include "DetectorConstruction.hh"
33
34 #include "G4PhysicalConstants.hh"
35 #include "G4SystemOfUnits.hh"
36 #include "G4NistManager.hh"
37 #include "G4RunManager.hh"
38
39 // Field
40 #include "G4Mag_UsualEqRhs.hh"
41 #include "G4TransportationManager.hh"
42 #include "G4ClassicalRK4.hh"
43 #include "G4PropagatorInField.hh"
44
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46
47 G4ThreadLocal TabulatedField3D* DetectorConstruction::fField = 0;
48
49 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50
51 DetectorConstruction::DetectorConstruction()
52 {
53 fDetectorMessenger = new DetectorMessenger(this);
54
55 // Default values (square field, coef calculation, profile)
56
57 fModel=1;
58 fG1=-11.964623;
59 fG2=16.494652;
60 fG3=9.866770;
61 fG4=-6.244493;
62 fCoef=0;
63 fProfile=1;
64 fGrid=0;
65
66 }
67
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
69
70 DetectorConstruction::~DetectorConstruction()
71 { delete fDetectorMessenger;}
72
73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
74
75 G4VPhysicalVolume* DetectorConstruction::Construct()
76
77 {
78 DefineMaterials();
79 return ConstructVolumes();
80 }
81
82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83
84 void DetectorConstruction::DefineMaterials()
85 {
86 G4String name, symbol;
87 G4double density;
88
89 G4double z, a;
90
91 // Vacuum standard definition...
92 density = universe_mean_density;
93 G4Material* vacuum = new G4Material(name="Vacuum", z=1., a=1.01*g/mole,
94 density);
95
96 // NIST
97 G4NistManager *man=G4NistManager::Instance();
98 man->SetVerbose(1);
99
100 //
101
102 G4cout << G4endl << *(G4Material::GetMaterialTable()) << G4endl;
103
104 // Default materials in setup.
105 fDefaultMaterial = vacuum;
106 fGridMaterial = man->FindOrBuildMaterial("G4_Ni");
107 }
108
109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
110
111 G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
112 {
113
114 fSolidWorld = new G4Box("World", //its name
115 12*m/2,12*m/2,22*m/2); //its size
116
117
118 fLogicWorld = new G4LogicalVolume(fSolidWorld, //its solid
119 fDefaultMaterial, //its material
120 "World"); //its name
121
122 fPhysiWorld = new G4PVPlacement(0, //no rotation
123 G4ThreeVector(), //at (0,0,0)
124 "World", //its name
125 fLogicWorld, //its logical volume
126 NULL, //its mother volume
127 false, //no boolean operation
128 0); //copy number
129
130
131 // MAGNET VOLUME
132
133 fSolidVol = new G4Box("Vol", //its name
134 10*m/2,10*m/2,9.120*m/2); //its size
135
136
137 fLogicVol = new G4LogicalVolume(fSolidVol, //its solid
138 fDefaultMaterial, //its material
139 "Vol"); //its name
140
141 fPhysiVol = new G4PVPlacement(0, //no rotation
142 G4ThreeVector(0,0,-4310*mm), //at (0,0,0)
143 "Vol", //its name
144 fLogicVol, //its logical volume
145 fPhysiWorld, //its mother volume
146 false, //no boolean operation
147 0); //copy number
148
149 // GRID
150
151 if (fGrid==1)
152 {
153
154 G4cout << G4endl;
155
156 G4cout << " ********************** " << G4endl;
157 G4cout << " **** GRID IN PLACE *** " << G4endl;
158 G4cout << " ********************** " << G4endl;
159
160 G4double x_grid=5.0*mm;
161 G4double y_grid=5.0*mm;
162 G4double grid_Zpos=(250+200)*mm; // 250+10 mm for object size of 50µm diam
163
164 //G4double thickness_grid=10*micrometer;
165 G4double thickness_grid=100*micrometer;
166
167 G4double z_grid=thickness_grid/2.0;
168
169 fSolidGridVol= new G4Box("GridVolume",x_grid,y_grid,z_grid); //its size
170
171 fLogicGridVol = new G4LogicalVolume(fSolidGridVol, //its solid
172 fGridMaterial, //its material
173 "GridVolume"); //its name
174
175 fPhysiGridVol = new G4PVPlacement(0, //no rotation
176 G4ThreeVector(0,0,grid_Zpos), // origin
177 fLogicGridVol, //its logical volume
178 "GridVolume", //its name
179 fLogicWorld, //its mother volume
180 false, //no boolean operation
181 0);
182
183 // Holes in grid
184
185 G4double holeSize= 9e-3*mm;
186 G4double pix_grid=1.3e-2*mm;
187 G4int num_half_grid=100;
188
189 fSolidGridVol_Hole= new G4Box("GridHole",holeSize/2,holeSize/2,z_grid); //its size
190
191 fLogicGridVol_Hole = new G4LogicalVolume(fSolidGridVol_Hole, //its solid
192 fDefaultMaterial, //its material
193 "GridHole"); //its name
194
195
196 for(int i=-num_half_grid;i<num_half_grid;i++)
197 {
198 for (int j=-num_half_grid;j<num_half_grid;j++)
199 {
200
201 G4double x0_grid,y0_grid,z0_grid;
202 G4int number_index_grid;
203
204 x0_grid=pix_grid*i;
205 y0_grid=pix_grid*j;
206 z0_grid=0.0*mm;
207
208 number_index_grid=(i+num_half_grid)*1000+(j+num_half_grid);
209
210 fPhysiGridVol_Hole = new G4PVPlacement(0, //no rotation
211 G4ThreeVector(x0_grid,y0_grid,z0_grid),//origin
212 fLogicGridVol_Hole, //its logical volume
213 "GridHole", //its name
214 fLogicGridVol, //its mother volume
215 false, //no boolean operation
216 number_index_grid);
217 }
218 }
219
220 // Grid imaging plane
221
222 G4double ContVolSizeXY = 1*m;
223 G4double ImPlaneWidth = 0.001*mm;
224
225 fSolidControlVol_GridShadow =
226 new G4Box
227 ("ControlVol_GridShadow", ContVolSizeXY/2, ContVolSizeXY/2 , ImPlaneWidth/2);
228
229 fLogicControlVol_GridShadow =
230 new G4LogicalVolume
231 (fSolidControlVol_GridShadow, fDefaultMaterial, "ControlVol_GridShadow");
232
233 fPhysiControlVol_GridShadow =
234 new G4PVPlacement
235 ( 0, G4ThreeVector(0,0,(250+300)*mm), fLogicControlVol_GridShadow, "ControlVol_GridShadow",
236 fLogicWorld, false, 0);
237
238
239 } // end GRID
240
241 // STEP MINIMUM SIZE
242 fLogicVol->SetUserLimits(new G4UserLimits(1*mm));
243
244 return fPhysiWorld;
245 }
246
247 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
248
249 void DetectorConstruction::SetG1(G4float value)
250 {
251 fG1 = value;
252 G4RunManager::GetRunManager()->ReinitializeGeometry();
253 }
254
255 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
256
257 void DetectorConstruction::SetG2(G4float value)
258 {
259 fG2 = value;
260 G4RunManager::GetRunManager()->ReinitializeGeometry();
261 }
262
263 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
264
265 void DetectorConstruction::SetG3(G4float value)
266 {
267 fG3 = value;
268 G4RunManager::GetRunManager()->ReinitializeGeometry();
269 }
270
271 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
272
273 void DetectorConstruction::SetG4(G4float value)
274 {
275 fG4 = value;
276 G4RunManager::GetRunManager()->ReinitializeGeometry();
277 }
278
279 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
280
281 void DetectorConstruction::SetModel(G4int modelChoice)
282 {
283 if (modelChoice==1) fModel=1;
284 if (modelChoice==2) fModel=2;
285 if (modelChoice==3) fModel=3;
286 G4RunManager::GetRunManager()->ReinitializeGeometry();
287 }
288
289 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
290
291 void DetectorConstruction::SetCoef(G4int val)
292 {
293 fCoef=val;
294 G4RunManager::GetRunManager()->ReinitializeGeometry();
295 }
296
297 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
298
299 G4int DetectorConstruction::GetCoef()
300 {
301 return fCoef;
302 }
303
304 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
305
306 void DetectorConstruction::SetProfile(G4int myProfile)
307 {
308 fProfile=myProfile;
309 G4RunManager::GetRunManager()->ReinitializeGeometry();
310 }
311
312 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
313
314 void DetectorConstruction::SetGrid(G4int myGrid)
315 {
316 fGrid=myGrid;
317 G4RunManager::GetRunManager()->ReinitializeGeometry();
318 }
319
320 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
321
322 void DetectorConstruction::ConstructSDandField()
323 {
324 fField = new TabulatedField3D(fG1, fG2, fG3, fG4, fModel);
325
326 //This is thread-local
327 G4FieldManager* fFieldMgr =
328 G4TransportationManager::GetTransportationManager()->GetFieldManager();
329
330 G4Mag_UsualEqRhs* fEquation = new G4Mag_UsualEqRhs (fField);
331
332 G4ClassicalRK4* fStepper = new G4ClassicalRK4 (fEquation);
333
334 G4ChordFinder* fChordFinder = new G4ChordFinder(fField,1e-9*m,fStepper);
335
336 fFieldMgr->SetChordFinder(fChordFinder);
337 fFieldMgr->SetDetectorField(fField);
338
339 // SI: 01-07-2018 : following settings were initially set to 1e-9*m
340 // instead of 1e-9*m, but they now induce warnings as
341 // *** G4Exception : GeomNav1002
342 // issued by : G4PropagatorInField::ComputeStep
343
344 fFieldMgr->GetChordFinder()->SetDeltaChord(1e-7*m);
345 fFieldMgr->SetDeltaIntersection(1e-7*m);
346 fFieldMgr->SetDeltaOneStep(1e-7*m);
347
348 //
349
350 // To avoid G4MagIntegratorDriver::OneGoodStep:Stepsize underflows in Stepper
351
352 if (fCoef==1)
353 {
354 G4PropagatorInField* fPropInField =
355 G4TransportationManager::GetTransportationManager()->GetPropagatorInField();
356 fPropInField->SetMinimumEpsilonStep(1e-11);
357 fPropInField->SetMaximumEpsilonStep(1e-10);
358
359 }
360 else
361 {
362 G4PropagatorInField* fPropInField =
363 G4TransportationManager::GetTransportationManager()->GetPropagatorInField();
364 fPropInField->SetMinimumEpsilonStep(1e-9);
365 fPropInField->SetMaximumEpsilonStep(1e-8);
366 }
367
368 }
369
370