DetectorConstruction.cc

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/// \file B1/src/DetectorConstruction.cc
/// \brief Implementation of the B1::DetectorConstruction class
 
#include "DetectorConstruction.hh"
 
#include "G4RunManager.hh"
#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4Cons.hh"
#include "G4Orb.hh"
#include "G4Sphere.hh"
#include "G4Trd.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4SystemOfUnits.hh"
 
namespace B1
{
 
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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  // Get nist material manager
  G4NistManager* nist = G4NistManager::Instance();
 
  // Envelope parameters
  //
  G4double env_sizeXY = 20*cm, env_sizeZ = 30*cm;
  G4Material* env_mat = nist->FindOrBuildMaterial("G4_WATER");
 
  // 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
 
  //
  // Shape 1
  //
  G4Material* shape1_mat = nist->FindOrBuildMaterial("G4_A-150_TISSUE");
  G4ThreeVector pos1 = G4ThreeVector(0, 2*cm, -7*cm);
 
  // Conical section shape
  G4double shape1_rmina =  0.*cm, shape1_rmaxa = 2.*cm;
  G4double shape1_rminb =  0.*cm, shape1_rmaxb = 4.*cm;
  G4double shape1_hz = 3.*cm;
  G4double shape1_phimin = 0.*deg, shape1_phimax = 360.*deg;
  auto solidShape1 = new G4Cons("Shape1", shape1_rmina, shape1_rmaxa, shape1_rminb, shape1_rmaxb,
    shape1_hz, shape1_phimin, shape1_phimax);
 
  auto logicShape1 = new G4LogicalVolume(solidShape1,  // its solid
    shape1_mat,                                        // its material
    "Shape1");                                         // its name
 
  new G4PVPlacement(nullptr,  // no rotation
    pos1,                     // at position
    logicShape1,              // its logical volume
    "Shape1",                 // its name
    logicEnv,                 // its mother  volume
    false,                    // no boolean operation
    0,                        // copy number
    checkOverlaps);           // overlaps checking
 
  //
  // Shape 2
  //
  G4Material* shape2_mat = nist->FindOrBuildMaterial("G4_BONE_COMPACT_ICRU");
  G4ThreeVector pos2 = G4ThreeVector(0, -1*cm, 7*cm);
 
  // Trapezoid shape
  G4double shape2_dxa = 12*cm, shape2_dxb = 12*cm;
  G4double shape2_dya = 10*cm, shape2_dyb = 16*cm;
  G4double shape2_dz  = 6*cm;
  auto solidShape2 = new G4Trd("Shape2",  // its name
    0.5 * shape2_dxa, 0.5 * shape2_dxb, 0.5 * shape2_dya, 0.5 * shape2_dyb,
    0.5 * shape2_dz);  // its size
 
  auto logicShape2 = new G4LogicalVolume(solidShape2,  // its solid
    shape2_mat,                                        // its material
    "Shape2");                                         // its name
 
  new G4PVPlacement(nullptr,  // no rotation
    pos2,                     // at position
    logicShape2,              // its logical volume
    "Shape2",                 // its name
    logicEnv,                 // its mother  volume
    false,                    // no boolean operation
    0,                        // copy number
    checkOverlaps);           // overlaps checking
 
  // Set Shape2 as scoring volume
  //
  fScoringVolume = logicShape2;
 
  //
  //always return the physical World
  //
  return physWorld;
}
 
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}