Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/examples/extended/electromagnetic/TestEm1/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/extended/electromagnetic/TestEm1/src/DetectorConstruction.cc (Version 11.3.0) and /examples/extended/electromagnetic/TestEm1/src/DetectorConstruction.cc (Version 9.5.p2)


  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 /// \file electromagnetic/TestEm1/src/Detector <<  26 
 27 /// \brief Implementation of the DetectorConst << 
 28 //                                                 27 //
                                                   >>  28 // $Id: DetectorConstruction.cc,v 1.8 2007-11-12 15:48:58 maire Exp $
                                                   >>  29 // GEANT4 tag $Name: not supported by cvs2svn $
 29 //                                                 30 //
                                                   >>  31 // 
 30                                                    32 
 31 //....oooOO0OOooo........oooOO0OOooo........oo     33 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 //....oooOO0OOooo........oooOO0OOooo........oo     34 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 33                                                    35 
 34 #include "DetectorConstruction.hh"                 36 #include "DetectorConstruction.hh"
 35                                                << 
 36 #include "DetectorMessenger.hh"                    37 #include "DetectorMessenger.hh"
 37                                                    38 
 38 #include "G4AutoDelete.hh"                     <<  39 #include "G4Material.hh"
 39 #include "G4Box.hh"                                40 #include "G4Box.hh"
 40 #include "G4GeometryManager.hh"                << 
 41 #include "G4GlobalMagFieldMessenger.hh"        << 
 42 #include "G4LogicalVolume.hh"                      41 #include "G4LogicalVolume.hh"
 43 #include "G4LogicalVolumeStore.hh"             << 
 44 #include "G4Material.hh"                       << 
 45 #include "G4NistManager.hh"                    << 
 46 #include "G4PVPlacement.hh"                        42 #include "G4PVPlacement.hh"
 47 #include "G4PhysicalConstants.hh"              <<  43 #include "G4UniformMagField.hh"
                                                   >>  44 
                                                   >>  45 #include "G4GeometryManager.hh"
 48 #include "G4PhysicalVolumeStore.hh"                46 #include "G4PhysicalVolumeStore.hh"
 49 #include "G4RunManager.hh"                     <<  47 #include "G4LogicalVolumeStore.hh"
 50 #include "G4SolidStore.hh"                         48 #include "G4SolidStore.hh"
 51 #include "G4SystemOfUnits.hh"                  <<  49 
 52 #include "G4UnitsTable.hh"                         50 #include "G4UnitsTable.hh"
 53                                                    51 
 54 //....oooOO0OOooo........oooOO0OOooo........oo     52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 55                                                    53 
 56 DetectorConstruction::DetectorConstruction()       54 DetectorConstruction::DetectorConstruction()
                                                   >>  55 :pBox(0), lBox(0), aMaterial(0), magField(0)
 57 {                                                  56 {
 58   fBoxSize = 10 * m;                           <<  57   BoxSize = 10*m;
 59   DefineMaterials();                               58   DefineMaterials();
 60   SetMaterial("G4_Al");                        <<  59   SetMaterial("Aluminium");  
 61   fDetectorMessenger = new DetectorMessenger(t <<  60   detectorMessenger = new DetectorMessenger(this);
 62 }                                                  61 }
 63                                                    62 
 64 //....oooOO0OOooo........oooOO0OOooo........oo     63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 65                                                    64 
 66 DetectorConstruction::~DetectorConstruction()      65 DetectorConstruction::~DetectorConstruction()
                                                   >>  66 { delete detectorMessenger;}
                                                   >>  67 
                                                   >>  68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
                                                   >>  69 
                                                   >>  70 G4VPhysicalVolume* DetectorConstruction::Construct()
 67 {                                                  71 {
 68   delete fDetectorMessenger;                   <<  72   return ConstructVolumes();
 69 }                                                  73 }
 70                                                    74 
 71 //....oooOO0OOooo........oooOO0OOooo........oo     75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 72                                                    76 
 73 void DetectorConstruction::DefineMaterials()       77 void DetectorConstruction::DefineMaterials()
 74 {                                                  78 {
 75   //                                               79   //
 76   // define Elements                               80   // define Elements
 77   //                                               81   //
 78   G4double z, a;                               <<  82   G4double z,a;
 79                                                <<  83   
 80   G4Element* H = new G4Element("Hydrogen", "H" <<  84   G4Element* H  = new G4Element("Hydrogen" ,"H" , z= 1., a=   1.01*g/mole);
 81   G4Element* C = new G4Element("Hydrogen", "C" <<  85   G4Element* C  = new G4Element("Hydrogen" ,"C" , z= 6., a=  12.00*g/mole);
 82   G4Element* N = new G4Element("Nitrogen", "N" <<  86   G4Element* N  = new G4Element("Nitrogen" ,"N" , z= 7., a=  14.01*g/mole);
 83   G4Element* O = new G4Element("Oxygen", "O",  <<  87   G4Element* O  = new G4Element("Oxygen"   ,"O" , z= 8., a=  16.00*g/mole);
 84   G4Element* Ge = new G4Element("Germanium", " <<  88   G4Element* Ge = new G4Element("Germanium","Ge", z=32., a=  72.59*g/mole);
 85   G4Element* Bi = new G4Element("Bismuth", "Bi <<  89   G4Element* Bi = new G4Element("Bismuth"  ,"Bi", z=83., a= 208.98*g/mole);
 86                                                <<  90   
 87   //                                               91   //
 88   // define materials                              92   // define materials
 89   //                                               93   //
 90   G4double density;                                94   G4double density;
 91   G4int ncomponents, natoms;                       95   G4int ncomponents, natoms;
 92   G4double fractionmass;                       <<  96   G4double fractionmass;  
 93                                                <<  97   
 94   G4Material* Air = new G4Material("Air", dens <<  98   G4Material* Air = 
 95   Air->AddElement(N, fractionmass = 70. * perC <<  99   new G4Material("Air", density= 1.290*mg/cm3, ncomponents=2);
 96   Air->AddElement(O, fractionmass = 30. * perC << 100   Air->AddElement(N, fractionmass=70.*perCent);
 97                                                << 101   Air->AddElement(O, fractionmass=30.*perCent);
 98   G4Material* H2l = new G4Material("H2liquid", << 
 99   H2l->AddElement(H, fractionmass = 1.);       << 
100                                                << 
101   G4Material* H2O = new G4Material("Water", de << 
102   H2O->AddElement(H, natoms = 2);              << 
103   H2O->AddElement(O, natoms = 1);              << 
104   /// H2O->SetChemicalFormula("H_2O");         << 
105   H2O->GetIonisation()->SetMeanExcitationEnerg << 
106                                                << 
107   density = 0.001 * mg / cm3;                  << 
108   G4Material* CO2 = new G4Material("CO2", dens << 
109   CO2->AddElement(C, natoms = 1);              << 
110   CO2->AddElement(O, natoms = 2);              << 
111                                                << 
112   G4Isotope* d = new G4Isotope("d", 1, 2, 0.0, << 
113   G4Element* D = new G4Element("Heavy-Hydrogen << 
114   D->AddIsotope(d, 1.0);                       << 
115   G4Material* D2 = new G4Material("D2_gas", de << 
116   D2->AddElement(D, natoms = 2);               << 
117                                                << 
118   new G4Material("liquidArgon", z = 18., a = 3 << 
119                                                << 
120   new G4Material("Aluminium", z = 13., a = 26. << 
121                                                   102 
122   new G4Material("Silicon", z = 14., a = 28.09 << 103   G4Material* H2l = 
                                                   >> 104   new G4Material("H2liquid", density= 70.8*mg/cm3, ncomponents=1);
                                                   >> 105   H2l->AddElement(H, fractionmass=1.);
123                                                   106 
124   new G4Material("Chromium", z = 24., a = 51.9 << 107   G4Material* H2O = 
                                                   >> 108   new G4Material("Water", density= 1.000*g/cm3, ncomponents=2);
                                                   >> 109   H2O->AddElement(H, natoms=2);
                                                   >> 110   H2O->AddElement(O, natoms=1);
                                                   >> 111   ///H2O->SetChemicalFormula("H_2O");
                                                   >> 112   H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
125                                                   113 
126   new G4Material("Germanium", z = 32., a = 72. << 114   density = 0.001*mg/cm3;
                                                   >> 115   G4Material* CO2 = new G4Material("CO2", density, ncomponents=2);
                                                   >> 116   CO2->AddElement(C, natoms=1);
                                                   >> 117   CO2->AddElement(O, natoms=2);
                                                   >> 118   
                                                   >> 119   new G4Material("D2_gas", z=2., a= 2.0141*g/mole, density= 0.036*mg/cm3);
127                                                   120 
128   G4Material* BGO = new G4Material("BGO", dens << 121   new G4Material("liquidArgon", z=18., a= 39.95*g/mole, density= 1.390*g/cm3);
129   BGO->AddElement(O, natoms = 12);             << 
130   BGO->AddElement(Ge, natoms = 3);             << 
131   BGO->AddElement(Bi, natoms = 4);             << 
132                                                   122 
133   new G4Material("Iron", z = 26., a = 55.85 *  << 123   new G4Material("Aluminium"  , z=13., a= 26.98*g/mole, density= 2.700*g/cm3);
134                                                   124 
135   new G4Material("Tungsten", z = 74., a = 183. << 125   new G4Material("Silicon"    , z=14., a= 28.09*g/mole, density= 2.330*g/cm3);
136                                                   126 
137   new G4Material("Gold", z = 79., a = 196.97 * << 127   new G4Material("Germanium"  , z=32., a= 72.61*g/mole, density= 5.323*g/cm3);
                                                   >> 128   
                                                   >> 129   G4Material* BGO = 
                                                   >> 130   new G4Material("BGO", density= 7.10*g/cm3, ncomponents=3);
                                                   >> 131   BGO->AddElement(O , natoms=12);
                                                   >> 132   BGO->AddElement(Ge, natoms= 3);
                                                   >> 133   BGO->AddElement(Bi, natoms= 4);  
138                                                   134 
139   new G4Material("Lead", z = 82., a = 207.19 * << 135   new G4Material("Iron"       , z=26., a= 55.85*g/mole, density= 7.870*g/cm3);
140                                                   136 
141   new G4Material("Uranium", z = 92., a = 238.0 << 137   new G4Material("Tungsten"   , z=74., a=183.85*g/mole, density= 19.30*g/cm3);
142                                                   138 
143   G4Material* argonGas =                       << 139   new G4Material("Lead"       , z=82., a=207.19*g/mole, density= 11.35*g/cm3);
144     new G4Material("ArgonGas", z = 18, a = 39. << 
145                    273.15 * kelvin, 1 * atmosp << 
146                                                   140 
147   G4Material* butane = new G4Material("Isobuta << 141   new G4Material("Uranium"    , z=92., a=238.03*g/mole, density= 18.95*g/cm3);
148                                       kStateGa << 
149   butane->AddElement(C, natoms = 4);           << 
150   butane->AddElement(H, natoms = 10);          << 
151                                                   142 
152   G4Material* ArButane = new G4Material("Argon << 
153                                         kState << 
154   ArButane->AddMaterial(argonGas, fractionmass << 
155   ArButane->AddMaterial(butane, fractionmass = << 
156                                                   143 
157   // example of vacuum                         << 144   G4cout << *(G4Material::GetMaterialTable()) << G4endl;
158   //                                           << 
159   density = universe_mean_density;  // from Ph << 
160   new G4Material("Galactic", z = 1., a = 1.008 << 
161                  3.e-18 * pascal);             << 
162                                                << 
163   // use Nist                                  << 
164   //                                           << 
165   G4NistManager* man = G4NistManager::Instance << 
166                                                << 
167   G4bool isotopes = false;                     << 
168   /// G4Element*  O = man->FindOrBuildElement( << 
169   G4Element* Si = man->FindOrBuildElement("Si" << 
170   G4Element* Lu = man->FindOrBuildElement("Lu" << 
171                                                << 
172   G4Material* LSO = new G4Material("Lu2SiO5",  << 
173   LSO->AddElement(Lu, 2);                      << 
174   LSO->AddElement(Si, 1);                      << 
175   LSO->AddElement(O, 5);                       << 
176                                                << 
177   /// G4cout << *(G4Material::GetMaterialTable << 
178 }                                                 145 }
179                                                   146 
180 //....oooOO0OOooo........oooOO0OOooo........oo    147 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
181                                                   148 
182 G4VPhysicalVolume* DetectorConstruction::Const << 149 G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
183 {                                                 150 {
184   if (fPBox) {                                 << 151   // Cleanup old geometry
185     return fPBox;                              << 152   G4GeometryManager::GetInstance()->OpenGeometry();
186   }                                            << 153   G4PhysicalVolumeStore::GetInstance()->Clean();
187   fBox = new G4Box("Container",  // its name   << 154   G4LogicalVolumeStore::GetInstance()->Clean();
188                    fBoxSize / 2, fBoxSize / 2, << 155   G4SolidStore::GetInstance()->Clean();
189                                                << 
190   fLBox = new G4LogicalVolume(fBox,  // its sh << 
191                               fMaterial,  // i << 
192                               fMaterial->GetNa << 
193                                                << 
194   fPBox = new G4PVPlacement(0,  // no rotation << 
195                             G4ThreeVector(),   << 
196                             fLBox,  // its log << 
197                             fMaterial->GetName << 
198                             0,  // its mother  << 
199                             false,  // no bool << 
200                             0);  // copy numbe << 
201                                                   156 
202   PrintParameters();                           << 157   G4Box*
                                                   >> 158   sBox = new G4Box("Container",       //its name
                                                   >> 159                    BoxSize/2,BoxSize/2,BoxSize/2);  //its dimensions
                                                   >> 160 
                                                   >> 161   lBox = new G4LogicalVolume(sBox,      //its shape
                                                   >> 162                              aMaterial,     //its material
                                                   >> 163                              aMaterial->GetName()); //its name
203                                                   164 
204   // always return the root volume             << 165   pBox = new G4PVPlacement(0,       //no rotation
                                                   >> 166            G4ThreeVector(),   //at (0,0,0)
                                                   >> 167                            lBox,      //its logical volume         
                                                   >> 168                            aMaterial->GetName(),  //its name
                                                   >> 169                            0,       //its mother  volume
                                                   >> 170                            false,     //no boolean operation
                                                   >> 171                            0);        //copy number
                                                   >> 172          
                                                   >> 173   PrintParameters();
                                                   >> 174   
                                                   >> 175   //always return the root volume
205   //                                              176   //
206   return fPBox;                                << 177   return pBox;
207 }                                                 178 }
208                                                   179 
209 //....oooOO0OOooo........oooOO0OOooo........oo    180 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
210                                                   181 
211 void DetectorConstruction::PrintParameters()      182 void DetectorConstruction::PrintParameters()
212 {                                                 183 {
213   G4cout << "\n The Box is " << G4BestUnit(fBo << 184   G4cout << "\n The Box is " << G4BestUnit(BoxSize,"Length")
214          << G4endl;                            << 185          << " of " << aMaterial->GetName() << G4endl;
215   G4cout << fMaterial << G4endl;               << 
216 }                                                 186 }
217                                                   187 
218 //....oooOO0OOooo........oooOO0OOooo........oo    188 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
219                                                   189 
220 void DetectorConstruction::SetMaterial(const G << 190 void DetectorConstruction::SetMaterial(G4String materialChoice)
221 {                                                 191 {
222   // search the material by its name              192   // search the material by its name
223   G4Material* pttoMaterial = G4NistManager::In << 193   G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);
224                                                << 194   if (pttoMaterial) aMaterial = pttoMaterial;
225   if (pttoMaterial) {                          << 
226     fMaterial = pttoMaterial;                  << 
227     if (fLBox) {                               << 
228       fLBox->SetMaterial(fMaterial);           << 
229     }                                          << 
230   }                                            << 
231   else {                                       << 
232     G4cout << "\n--> warning from DetectorCons << 
233            << " not found" << G4endl;          << 
234   }                                            << 
235   G4RunManager::GetRunManager()->PhysicsHasBee << 
236 }                                                 195 }
237                                                   196 
238 //....oooOO0OOooo........oooOO0OOooo........oo    197 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
239                                                   198 
240 void DetectorConstruction::SetSize(G4double va    199 void DetectorConstruction::SetSize(G4double value)
241 {                                                 200 {
242   fBoxSize = value;                            << 201   BoxSize = value;
243   if (fBox) {                                  << 202 }
244     fBox->SetXHalfLength(fBoxSize / 2);        << 203 
245     fBox->SetYHalfLength(fBoxSize / 2);        << 204 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
246     fBox->SetZHalfLength(fBoxSize / 2);        << 205 
247   }                                            << 206 #include "G4FieldManager.hh"
                                                   >> 207 #include "G4TransportationManager.hh"
                                                   >> 208 
                                                   >> 209 void DetectorConstruction::SetMagField(G4double fieldValue)
                                                   >> 210 {
                                                   >> 211   //apply a global uniform magnetic field along Z axis
                                                   >> 212   G4FieldManager* fieldMgr
                                                   >> 213    = G4TransportationManager::GetTransportationManager()->GetFieldManager();
                                                   >> 214 
                                                   >> 215   if (magField) delete magField;  //delete the existing magn field
                                                   >> 216 
                                                   >> 217   if (fieldValue!=0.)     // create a new one if non nul
                                                   >> 218     {
                                                   >> 219       magField = new G4UniformMagField(G4ThreeVector(0.,0.,fieldValue));
                                                   >> 220       fieldMgr->SetDetectorField(magField);
                                                   >> 221       fieldMgr->CreateChordFinder(magField);
                                                   >> 222     }
                                                   >> 223    else
                                                   >> 224     {
                                                   >> 225       magField = 0;
                                                   >> 226       fieldMgr->SetDetectorField(magField);
                                                   >> 227     }
248 }                                                 228 }
249                                                   229 
250 //....oooOO0OOooo........oooOO0OOooo........oo    230 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
251                                                   231 
252 void DetectorConstruction::ConstructSDandField << 232 #include "G4RunManager.hh"
253 {                                              << 233 
254   if (fFieldMessenger.Get() == 0) {            << 234 void DetectorConstruction::UpdateGeometry()
255     // Create global magnetic field messenger. << 235 {
256     // Uniform magnetic field is then created  << 236   G4RunManager::GetRunManager()->DefineWorldVolume(ConstructVolumes());
257     // the field value is not zero.            << 
258     G4ThreeVector fieldValue = G4ThreeVector() << 
259     G4GlobalMagFieldMessenger* msg = new G4Glo << 
260     // msg->SetVerboseLevel(1);                << 
261     G4AutoDelete::Register(msg);               << 
262     fFieldMessenger.Put(msg);                  << 
263   }                                            << 
264 }                                                 237 }
265                                                   238 
266 //....oooOO0OOooo........oooOO0OOooo........oo    239 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
267                                                   240