Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/examples/basic/B4/B4d/src/DetectorConstruction.cc

Version: [ ReleaseNotes ] [ 1.0 ] [ 1.1 ] [ 2.0 ] [ 3.0 ] [ 3.1 ] [ 3.2 ] [ 4.0 ] [ 4.0.p1 ] [ 4.0.p2 ] [ 4.1 ] [ 4.1.p1 ] [ 5.0 ] [ 5.0.p1 ] [ 5.1 ] [ 5.1.p1 ] [ 5.2 ] [ 5.2.p1 ] [ 5.2.p2 ] [ 6.0 ] [ 6.0.p1 ] [ 6.1 ] [ 6.2 ] [ 6.2.p1 ] [ 6.2.p2 ] [ 7.0 ] [ 7.0.p1 ] [ 7.1 ] [ 7.1.p1 ] [ 8.0 ] [ 8.0.p1 ] [ 8.1 ] [ 8.1.p1 ] [ 8.1.p2 ] [ 8.2 ] [ 8.2.p1 ] [ 8.3 ] [ 8.3.p1 ] [ 8.3.p2 ] [ 9.0 ] [ 9.0.p1 ] [ 9.0.p2 ] [ 9.1 ] [ 9.1.p1 ] [ 9.1.p2 ] [ 9.1.p3 ] [ 9.2 ] [ 9.2.p1 ] [ 9.2.p2 ] [ 9.2.p3 ] [ 9.2.p4 ] [ 9.3 ] [ 9.3.p1 ] [ 9.3.p2 ] [ 9.4 ] [ 9.4.p1 ] [ 9.4.p2 ] [ 9.4.p3 ] [ 9.4.p4 ] [ 9.5 ] [ 9.5.p1 ] [ 9.5.p2 ] [ 9.6 ] [ 9.6.p1 ] [ 9.6.p2 ] [ 9.6.p3 ] [ 9.6.p4 ] [ 10.0 ] [ 10.0.p1 ] [ 10.0.p2 ] [ 10.0.p3 ] [ 10.0.p4 ] [ 10.1 ] [ 10.1.p1 ] [ 10.1.p2 ] [ 10.1.p3 ] [ 10.2 ] [ 10.2.p1 ] [ 10.2.p2 ] [ 10.2.p3 ] [ 10.3 ] [ 10.3.p1 ] [ 10.3.p2 ] [ 10.3.p3 ] [ 10.4 ] [ 10.4.p1 ] [ 10.4.p2 ] [ 10.4.p3 ] [ 10.5 ] [ 10.5.p1 ] [ 10.6 ] [ 10.6.p1 ] [ 10.6.p2 ] [ 10.6.p3 ] [ 10.7 ] [ 10.7.p1 ] [ 10.7.p2 ] [ 10.7.p3 ] [ 10.7.p4 ] [ 11.0 ] [ 11.0.p1 ] [ 11.0.p2 ] [ 11.0.p3, ] [ 11.0.p4 ] [ 11.1 ] [ 11.1.1 ] [ 11.1.2 ] [ 11.1.3 ] [ 11.2 ] [ 11.2.1 ] [ 11.2.2 ] [ 11.3.0 ]

Diff markup

Differences between /examples/basic/B4/B4d/src/DetectorConstruction.cc (Version 11.3.0) and /examples/basic/B4/B4d/src/DetectorConstruction.cc (Version 11.2)


  1 //                                                  1 //
  2 // *******************************************      2 // ********************************************************************
  3 // * License and Disclaimer                         3 // * License and Disclaimer                                           *
  4 // *                                                4 // *                                                                  *
  5 // * The  Geant4 software  is  copyright of th      5 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
  6 // * the Geant4 Collaboration.  It is provided      6 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
  7 // * conditions of the Geant4 Software License      7 // * conditions of the Geant4 Software License,  included in the file *
  8 // * LICENSE and available at  http://cern.ch/      8 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
  9 // * include a list of copyright holders.           9 // * include a list of copyright holders.                             *
 10 // *                                               10 // *                                                                  *
 11 // * Neither the authors of this software syst     11 // * Neither the authors of this software system, nor their employing *
 12 // * institutes,nor the agencies providing fin     12 // * institutes,nor the agencies providing financial support for this *
 13 // * work  make  any representation or  warran     13 // * work  make  any representation or  warranty, express or implied, *
 14 // * regarding  this  software system or assum     14 // * regarding  this  software system or assume any liability for its *
 15 // * use.  Please see the license in the file      15 // * use.  Please see the license in the file  LICENSE  and URL above *
 16 // * for the full disclaimer and the limitatio     16 // * for the full disclaimer and the limitation of liability.         *
 17 // *                                               17 // *                                                                  *
 18 // * This  code  implementation is the result      18 // * This  code  implementation is the result of  the  scientific and *
 19 // * technical work of the GEANT4 collaboratio     19 // * technical work of the GEANT4 collaboration.                      *
 20 // * By using,  copying,  modifying or  distri     20 // * By using,  copying,  modifying or  distributing the software (or *
 21 // * any work based  on the software)  you  ag     21 // * any work based  on the software)  you  agree  to acknowledge its *
 22 // * use  in  resulting  scientific  publicati     22 // * use  in  resulting  scientific  publications,  and indicate your *
 23 // * acceptance of all terms of the Geant4 Sof     23 // * acceptance of all terms of the Geant4 Software license.          *
 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 //                                                 26 //
 27 /// \file B4/B4d/src/DetectorConstruction.cc       27 /// \file B4/B4d/src/DetectorConstruction.cc
 28 /// \brief Implementation of the B4d::Detector     28 /// \brief Implementation of the B4d::DetectorConstruction class
 29                                                    29 
 30 #include "DetectorConstruction.hh"                 30 #include "DetectorConstruction.hh"
 31                                                    31 
 32 #include "G4AutoDelete.hh"                     << 
 33 #include "G4Box.hh"                            << 
 34 #include "G4Colour.hh"                         << 
 35 #include "G4GlobalMagFieldMessenger.hh"        << 
 36 #include "G4LogicalVolume.hh"                  << 
 37 #include "G4Material.hh"                           32 #include "G4Material.hh"
 38 #include "G4MultiFunctionalDetector.hh"        << 
 39 #include "G4NistManager.hh"                        33 #include "G4NistManager.hh"
 40 #include "G4PSEnergyDeposit.hh"                <<  34 
 41 #include "G4PSTrackLength.hh"                  <<  35 #include "G4Box.hh"
                                                   >>  36 #include "G4LogicalVolume.hh"
 42 #include "G4PVPlacement.hh"                        37 #include "G4PVPlacement.hh"
 43 #include "G4PVReplica.hh"                          38 #include "G4PVReplica.hh"
 44 #include "G4PhysicalConstants.hh"              <<  39 #include "G4GlobalMagFieldMessenger.hh"
 45 #include "G4SDChargedFilter.hh"                <<  40 #include "G4AutoDelete.hh"
                                                   >>  41 
 46 #include "G4SDManager.hh"                          42 #include "G4SDManager.hh"
 47 #include "G4SystemOfUnits.hh"                  <<  43 #include "G4SDChargedFilter.hh"
                                                   >>  44 #include "G4MultiFunctionalDetector.hh"
 48 #include "G4VPrimitiveScorer.hh"                   45 #include "G4VPrimitiveScorer.hh"
                                                   >>  46 #include "G4PSEnergyDeposit.hh"
                                                   >>  47 #include "G4PSTrackLength.hh"
                                                   >>  48 
 49 #include "G4VisAttributes.hh"                      49 #include "G4VisAttributes.hh"
                                                   >>  50 #include "G4Colour.hh"
                                                   >>  51 
                                                   >>  52 #include "G4PhysicalConstants.hh"
                                                   >>  53 #include "G4SystemOfUnits.hh"
 50                                                    54 
 51 namespace B4d                                      55 namespace B4d
 52 {                                                  56 {
 53                                                    57 
 54 //....oooOO0OOooo........oooOO0OOooo........oo     58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 55                                                    59 
 56 G4ThreadLocal G4GlobalMagFieldMessenger* Detec <<  60 G4ThreadLocal
                                                   >>  61 G4GlobalMagFieldMessenger* DetectorConstruction::fMagFieldMessenger = nullptr;
 57                                                    62 
 58 //....oooOO0OOooo........oooOO0OOooo........oo     63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 59                                                    64 
 60 G4VPhysicalVolume* DetectorConstruction::Const     65 G4VPhysicalVolume* DetectorConstruction::Construct()
 61 {                                                  66 {
 62   // Define materials                              67   // Define materials
 63   DefineMaterials();                               68   DefineMaterials();
 64                                                    69 
 65   // Define volumes                                70   // Define volumes
 66   return DefineVolumes();                          71   return DefineVolumes();
 67 }                                                  72 }
 68                                                    73 
 69 //....oooOO0OOooo........oooOO0OOooo........oo     74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 70                                                    75 
 71 void DetectorConstruction::DefineMaterials()       76 void DetectorConstruction::DefineMaterials()
 72 {                                                  77 {
 73   // Lead material defined using NIST Manager      78   // Lead material defined using NIST Manager
 74   auto nistManager = G4NistManager::Instance()     79   auto nistManager = G4NistManager::Instance();
 75   nistManager->FindOrBuildMaterial("G4_Pb");       80   nistManager->FindOrBuildMaterial("G4_Pb");
 76                                                    81 
 77   // Liquid argon material                         82   // Liquid argon material
 78   G4double a;  // mass of a mole;                  83   G4double a;  // mass of a mole;
 79   G4double z;  // z=mean number of protons;        84   G4double z;  // z=mean number of protons;
 80   G4double density;                                85   G4double density;
 81   new G4Material("liquidArgon", z = 18., a = 3 <<  86   new G4Material("liquidArgon", z=18., a= 39.95*g/mole, density= 1.390*g/cm3);
 82   // The argon by NIST Manager is a gas with a <<  87          // The argon by NIST Manager is a gas with a different density
 83                                                    88 
 84   // Vacuum                                        89   // Vacuum
 85   new G4Material("Galactic", z = 1., a = 1.01  <<  90   new G4Material("Galactic", z=1., a=1.01*g/mole,density= universe_mean_density,
 86                  kStateGas, 2.73 * kelvin, 3.e <<  91                   kStateGas, 2.73*kelvin, 3.e-18*pascal);
 87                                                    92 
 88   // Print materials                               93   // Print materials
 89   G4cout << *(G4Material::GetMaterialTable())      94   G4cout << *(G4Material::GetMaterialTable()) << G4endl;
 90 }                                                  95 }
 91                                                    96 
 92 //....oooOO0OOooo........oooOO0OOooo........oo     97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 93                                                    98 
 94 G4VPhysicalVolume* DetectorConstruction::Defin     99 G4VPhysicalVolume* DetectorConstruction::DefineVolumes()
 95 {                                                 100 {
 96   // Geometry parameters                          101   // Geometry parameters
 97   G4int nofLayers = 10;                        << 102   G4int  nofLayers = 10;
 98   G4double absoThickness = 10. * mm;           << 103   G4double  absoThickness = 10.*mm;
 99   G4double gapThickness = 5. * mm;             << 104   G4double  gapThickness =  5.*mm;
100   G4double calorSizeXY = 10. * cm;             << 105   G4double  calorSizeXY  = 10.*cm;
101                                                << 106 
102   auto layerThickness = absoThickness + gapThi << 107   auto  layerThickness = absoThickness + gapThickness;
103   auto calorThickness = nofLayers * layerThick << 108   auto  calorThickness = nofLayers * layerThickness;
104   auto worldSizeXY = 1.2 * calorSizeXY;        << 109   auto  worldSizeXY = 1.2 * calorSizeXY;
105   auto worldSizeZ = 1.2 * calorThickness;      << 110   auto  worldSizeZ  = 1.2 * calorThickness;
106                                                   111 
107   // Get materials                                112   // Get materials
108   auto defaultMaterial = G4Material::GetMateri    113   auto defaultMaterial = G4Material::GetMaterial("Galactic");
109   auto absorberMaterial = G4Material::GetMater    114   auto absorberMaterial = G4Material::GetMaterial("G4_Pb");
110   auto gapMaterial = G4Material::GetMaterial("    115   auto gapMaterial = G4Material::GetMaterial("liquidArgon");
111                                                   116 
112   if (!defaultMaterial || !absorberMaterial || << 117   if ( ! defaultMaterial || ! absorberMaterial || ! gapMaterial ) {
113     G4ExceptionDescription msg;                   118     G4ExceptionDescription msg;
114     msg << "Cannot retrieve materials already     119     msg << "Cannot retrieve materials already defined.";
115     G4Exception("DetectorConstruction::DefineV << 120     G4Exception("DetectorConstruction::DefineVolumes()",
                                                   >> 121       "MyCode0001", FatalException, msg);
116   }                                               122   }
117                                                   123 
118   //                                              124   //
119   // World                                        125   // World
120   //                                              126   //
121   auto worldS = new G4Box("World",  // its nam << 127   auto worldS
122                           worldSizeXY / 2, wor << 128     = new G4Box("World",           // its name
123                                                << 129                  worldSizeXY/2, worldSizeXY/2, worldSizeZ/2); // its size
124   auto worldLV = new G4LogicalVolume(worldS,   << 130 
125                                      defaultMa << 131   auto worldLV
126                                      "World"); << 132     = new G4LogicalVolume(
                                                   >> 133                  worldS,           // its solid
                                                   >> 134                  defaultMaterial,  // its material
                                                   >> 135                  "World");         // its name
127                                                   136 
128   auto worldPV = new G4PVPlacement(nullptr,  /    137   auto worldPV = new G4PVPlacement(nullptr,  // no rotation
129                                    G4ThreeVect << 138     G4ThreeVector(),                         // at (0,0,0)
130                                    worldLV,  / << 139     worldLV,                                 // its logical volume
131                                    "World",  / << 140     "World",                                 // its name
132                                    nullptr,  / << 141     nullptr,                                 // its mother  volume
133                                    false,  //  << 142     false,                                   // no boolean operation
134                                    0,  // copy << 143     0,                                       // copy number
135                                    fCheckOverl << 144     fCheckOverlaps);                         // checking overlaps
136                                                   145 
137   //                                              146   //
138   // Calorimeter                                  147   // Calorimeter
139   //                                              148   //
140   auto calorimeterS = new G4Box("Calorimeter", << 149   auto calorimeterS
141                                 calorSizeXY /  << 150     = new G4Box("Calorimeter",     // its name
142                                                << 151                  calorSizeXY/2, calorSizeXY/2, calorThickness/2); // its size
143   auto calorLV = new G4LogicalVolume(calorimet << 152 
144                                      defaultMa << 153   auto calorLV
145                                      "Calorime << 154     = new G4LogicalVolume(
                                                   >> 155                  calorimeterS,    // its solid
                                                   >> 156                  defaultMaterial, // its material
                                                   >> 157                  "Calorimeter");  // its name
146                                                   158 
147   new G4PVPlacement(nullptr,  // no rotation      159   new G4PVPlacement(nullptr,  // no rotation
148                     G4ThreeVector(),  // at (0 << 160     G4ThreeVector(),          // at (0,0,0)
149                     calorLV,  // its logical v << 161     calorLV,                  // its logical volume
150                     "Calorimeter",  // its nam << 162     "Calorimeter",            // its name
151                     worldLV,  // its mother  v << 163     worldLV,                  // its mother  volume
152                     false,  // no boolean oper << 164     false,                    // no boolean operation
153                     0,  // copy number         << 165     0,                        // copy number
154                     fCheckOverlaps);  // check << 166     fCheckOverlaps);          // checking overlaps
155                                                   167 
156   //                                              168   //
157   // Layer                                        169   // Layer
158   //                                              170   //
159   auto layerS = new G4Box("Layer",  // its nam << 171   auto layerS
160                           calorSizeXY / 2, cal << 172     = new G4Box("Layer",           // its name
161                                                << 173                  calorSizeXY/2, calorSizeXY/2, layerThickness/2); // its size
162   auto layerLV = new G4LogicalVolume(layerS,   << 174 
163                                      defaultMa << 175   auto layerLV
164                                      "Layer"); << 176     = new G4LogicalVolume(
165                                                << 177                  layerS,           // its solid
166   new G4PVReplica("Layer",  // its name        << 178                  defaultMaterial,  // its material
167                   layerLV,  // its logical vol << 179                  "Layer");         // its name
168                   calorLV,  // its mother      << 180 
169                   kZAxis,  // axis of replicat << 181   new G4PVReplica(
170                   nofLayers,  // number of rep << 182                  "Layer",          // its name
171                   layerThickness);  // witdth  << 183                  layerLV,          // its logical volume
                                                   >> 184                  calorLV,          // its mother
                                                   >> 185                  kZAxis,           // axis of replication
                                                   >> 186                  nofLayers,        // number of replica
                                                   >> 187                  layerThickness);  // witdth of replica
172                                                   188 
173   //                                              189   //
174   // Absorber                                     190   // Absorber
175   //                                              191   //
176   auto absorberS = new G4Box("Abso",  // its n << 192   auto absorberS
177                              calorSizeXY / 2,  << 193     = new G4Box("Abso",            // its name
178                                                << 194                  calorSizeXY/2, calorSizeXY/2, absoThickness/2); // its size
179   auto absorberLV = new G4LogicalVolume(absorb << 195 
180                                         absorb << 196   auto absorberLV
181                                         "AbsoL << 197     = new G4LogicalVolume(
182                                                << 198                  absorberS,        // its solid
183   new G4PVPlacement(nullptr,  // no rotation   << 199                  absorberMaterial, // its material
184                     G4ThreeVector(0., 0., -gap << 200                  "AbsoLV");          // its name
185                     absorberLV,  // its logica << 201 
186                     "Abso",  // its name       << 202   new G4PVPlacement(nullptr,                   // no rotation
187                     layerLV,  // its mother  v << 203     G4ThreeVector(0., 0., -gapThickness / 2),  //  its position
188                     false,  // no boolean oper << 204     absorberLV,                                // its logical volume
189                     0,  // copy number         << 205     "Abso",                                    // its name
190                     fCheckOverlaps);  // check << 206     layerLV,                                   // its mother  volume
                                                   >> 207     false,                                     // no boolean operation
                                                   >> 208     0,                                         // copy number
                                                   >> 209     fCheckOverlaps);                           // checking overlaps
191                                                   210 
192   //                                              211   //
193   // Gap                                          212   // Gap
194   //                                              213   //
195   auto gapS = new G4Box("Gap",  // its name    << 214   auto gapS
196                         calorSizeXY / 2, calor << 215     = new G4Box("Gap",             // its name
197                                                << 216                  calorSizeXY/2, calorSizeXY/2, gapThickness/2); // its size
198   auto gapLV = new G4LogicalVolume(gapS,  // i << 217 
199                                    gapMaterial << 218   auto gapLV
200                                    "GapLV");   << 219     = new G4LogicalVolume(
201                                                << 220                  gapS,             // its solid
202   new G4PVPlacement(nullptr,  // no rotation   << 221                  gapMaterial,      // its material
203                     G4ThreeVector(0., 0., abso << 222                  "GapLV");      // its name
204                     gapLV,  // its logical vol << 223 
205                     "Gap",  // its name        << 224   new G4PVPlacement(nullptr,                   // no rotation
206                     layerLV,  // its mother  v << 225     G4ThreeVector(0., 0., absoThickness / 2),  //  its position
207                     false,  // no boolean oper << 226     gapLV,                                     // its logical volume
208                     0,  // copy number         << 227     "Gap",                                     // its name
209                     fCheckOverlaps);  // check << 228     layerLV,                                   // its mother  volume
                                                   >> 229     false,                                     // no boolean operation
                                                   >> 230     0,                                         // copy number
                                                   >> 231     fCheckOverlaps);                           // checking overlaps
210                                                   232 
211   //                                              233   //
212   // print parameters                             234   // print parameters
213   //                                              235   //
214   G4cout << G4endl << "----------------------- << 236   G4cout
215          << "---> The calorimeter is " << nofL << 237     << G4endl
216          << "mm of " << absorberMaterial->GetN << 238     << "------------------------------------------------------------" << G4endl
217          << gapMaterial->GetName() << " ] " << << 239     << "---> The calorimeter is " << nofLayers << " layers of: [ "
218          << "--------------------------------- << 240     << absoThickness/mm << "mm of " << absorberMaterial->GetName()
                                                   >> 241     << " + "
                                                   >> 242     << gapThickness/mm << "mm of " << gapMaterial->GetName() << " ] " << G4endl
                                                   >> 243     << "------------------------------------------------------------" << G4endl;
219                                                   244 
220   //                                              245   //
221   // Visualization attributes                     246   // Visualization attributes
222   //                                              247   //
223   worldLV->SetVisAttributes(G4VisAttributes::G    248   worldLV->SetVisAttributes(G4VisAttributes::GetInvisible());
224   calorLV->SetVisAttributes(G4VisAttributes(G4    249   calorLV->SetVisAttributes(G4VisAttributes(G4Colour::White()));
225                                                   250 
226   //                                              251   //
227   // Always return the physical World             252   // Always return the physical World
228   //                                              253   //
229   return worldPV;                                 254   return worldPV;
230 }                                                 255 }
231                                                   256 
232 //....oooOO0OOooo........oooOO0OOooo........oo    257 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
233                                                   258 
234 void DetectorConstruction::ConstructSDandField    259 void DetectorConstruction::ConstructSDandField()
235 {                                                 260 {
236   G4SDManager::GetSDMpointer()->SetVerboseLeve    261   G4SDManager::GetSDMpointer()->SetVerboseLevel(1);
237   //                                              262   //
238   // Scorers                                      263   // Scorers
239   //                                              264   //
240                                                   265 
241   // declare Absorber as a MultiFunctionalDete    266   // declare Absorber as a MultiFunctionalDetector scorer
242   //                                              267   //
243   auto absDetector = new G4MultiFunctionalDete    268   auto absDetector = new G4MultiFunctionalDetector("Absorber");
244   G4SDManager::GetSDMpointer()->AddNewDetector    269   G4SDManager::GetSDMpointer()->AddNewDetector(absDetector);
245                                                   270 
246   G4VPrimitiveScorer* primitive;                  271   G4VPrimitiveScorer* primitive;
247   primitive = new G4PSEnergyDeposit("Edep");      272   primitive = new G4PSEnergyDeposit("Edep");
248   absDetector->RegisterPrimitive(primitive);      273   absDetector->RegisterPrimitive(primitive);
249                                                   274 
250   primitive = new G4PSTrackLength("TrackLength    275   primitive = new G4PSTrackLength("TrackLength");
251   auto charged = new G4SDChargedFilter("charge    276   auto charged = new G4SDChargedFilter("chargedFilter");
252   primitive->SetFilter(charged);               << 277   primitive ->SetFilter(charged);
253   absDetector->RegisterPrimitive(primitive);      278   absDetector->RegisterPrimitive(primitive);
254                                                   279 
255   SetSensitiveDetector("AbsoLV", absDetector); << 280   SetSensitiveDetector("AbsoLV",absDetector);
256                                                   281 
257   // declare Gap as a MultiFunctionalDetector     282   // declare Gap as a MultiFunctionalDetector scorer
258   //                                              283   //
259   auto gapDetector = new G4MultiFunctionalDete    284   auto gapDetector = new G4MultiFunctionalDetector("Gap");
260   G4SDManager::GetSDMpointer()->AddNewDetector    285   G4SDManager::GetSDMpointer()->AddNewDetector(gapDetector);
261                                                   286 
262   primitive = new G4PSEnergyDeposit("Edep");      287   primitive = new G4PSEnergyDeposit("Edep");
263   gapDetector->RegisterPrimitive(primitive);      288   gapDetector->RegisterPrimitive(primitive);
264                                                   289 
265   primitive = new G4PSTrackLength("TrackLength    290   primitive = new G4PSTrackLength("TrackLength");
266   primitive->SetFilter(charged);               << 291   primitive ->SetFilter(charged);
267   gapDetector->RegisterPrimitive(primitive);      292   gapDetector->RegisterPrimitive(primitive);
268                                                   293 
269   SetSensitiveDetector("GapLV", gapDetector);  << 294   SetSensitiveDetector("GapLV",gapDetector);
270                                                   295 
271   //                                              296   //
272   // Magnetic field                               297   // Magnetic field
273   //                                              298   //
274   // Create global magnetic field messenger.      299   // Create global magnetic field messenger.
275   // Uniform magnetic field is then created au    300   // Uniform magnetic field is then created automatically if
276   // the field value is not zero.                 301   // the field value is not zero.
277   G4ThreeVector fieldValue;                       302   G4ThreeVector fieldValue;
278   fMagFieldMessenger = new G4GlobalMagFieldMes    303   fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
279   fMagFieldMessenger->SetVerboseLevel(1);         304   fMagFieldMessenger->SetVerboseLevel(1);
280                                                   305 
281   // Register the field messenger for deleting    306   // Register the field messenger for deleting
282   G4AutoDelete::Register(fMagFieldMessenger);     307   G4AutoDelete::Register(fMagFieldMessenger);
283 }                                                 308 }
284                                                   309 
285 //....oooOO0OOooo........oooOO0OOooo........oo    310 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
286                                                   311 
287 }  // namespace B4d                            << 312 }
288                                                   313