DetectorConstruction.cc

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/// \file B1/src/DetectorConstruction.cc
/// \brief Implementation of the B1::DetectorConstruction class
 
#include <cmath>
 
#include "DetectorConstruction.hh"
 
#include "G4RunManager.hh"
#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4Tubs.hh"
#include "G4SubtractionSolid.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4SystemOfUnits.hh"
 
namespace VtkVis
{
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4VPhysicalVolume* DetectorConstruction::Construct()
{
  // Get nist material manager
  G4NistManager* nist = G4NistManager::Instance();
 
  // Envelope parameters
  //
  G4double env_sizeXY = 10*m, env_sizeZ = 10*m;
  G4Material* env_mat = nist->FindOrBuildMaterial("G4_Galactic");
 
  // Option to switch on/off checking of volumes overlaps
  //
  G4bool checkOverlaps = true;
 
  //
  // World
  //
  G4double world_sizeXY = 1.2*env_sizeXY;
  G4double world_sizeZ  = 1.2*env_sizeZ;
  G4Material* world_mat = nist->FindOrBuildMaterial("G4_AIR");
 
  auto solidWorld = new G4Box("World",                           // its name
    0.5 * world_sizeXY, 0.5 * world_sizeXY, 0.5 * world_sizeZ);  // its size
 
  auto logicWorld = new G4LogicalVolume(solidWorld,  // its solid
    world_mat,                                       // its material
    "World");                                        // its name
 
  auto physWorld = new G4PVPlacement(nullptr,  // no rotation
    G4ThreeVector(),                           // at (0,0,0)
    logicWorld,                                // its logical volume
    "World",                                   // its name
    nullptr,                                   // its mother  volume
    false,                                     // no boolean operation
    0,                                         // copy number
    checkOverlaps);                            // overlaps checking
 
  //
  // Envelope
  //
  auto solidEnv = new G4Box("Envelope",                    // its name
    0.5 * env_sizeXY, 0.5 * env_sizeXY, 0.5 * env_sizeZ);  // its size
 
  auto logicEnv = new G4LogicalVolume(solidEnv,  // its solid
    env_mat,                                     // its material
    "Envelope");                                 // its name
 
  new G4PVPlacement(nullptr,  // no rotation
    G4ThreeVector(),          // at (0,0,0)
    logicEnv,                 // its logical volume
    "Envelope",               // its name
    logicWorld,               // its mother  volume
    false,                    // no boolean operation
    0,                        // copy number
    checkOverlaps);           // overlaps checking
 
 
  auto dumpPos = G4ThreeVector(0, 0, 0);
  auto dumpMat = nist->FindOrBuildMaterial("G4_CONCRETE");
  auto dumpShape1   = new G4Box("dumpShape1", 1*m, 1*m, 0.5*m);
 
  auto dumpCutoutPos   = G4ThreeVector(0, 0, -5.1*cm);
  auto dumpCutoutShape = new G4Tubs("DumpCutoutShape", 0*cm, 10*cm, 90/2*cm, 0, 2*M_PI);
 
  auto dumpShape2 = new G4SubtractionSolid("dumpShape2",dumpShape1, dumpCutoutShape, 0,
                                           dumpCutoutPos);
 
  auto dumpLogical = new G4LogicalVolume(dumpShape2,
                                         dumpMat, // its material
                                         "dump");
  // its name
  new G4PVPlacement(nullptr,                  // no rotation
                    dumpPos,                  // at position
                    dumpLogical,              // its logical volume
                    "dump",                   // its name
                    logicEnv,                 // its mother  volume
                    false,                    // no boolean operation
                    0,                        // copy number
                    checkOverlaps);           // overlaps checking
 
 
 
  fScoringVolume = dumpLogical;
 
  //
  //always return the physical World
  //
  return physWorld;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
}