examples/extended/polarisation/Pol01/src/DetectorConstruction.cc

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//
// $Id: DetectorConstruction.cc 98772 2016-08-09 14:25:31Z gcosmo $
//
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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4Material.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"

#include "G4GeometryManager.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4SolidStore.hh"

#include "G4UnitsTable.hh"

#include "G4PolarizationManager.hh"
#include "G4NistManager.hh"
#include "G4SystemOfUnits.hh"

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DetectorConstruction::DetectorConstruction()
: G4VUserDetectorConstruction(),
  fWorld(0), fBox(0), fTargetMaterial(0), fWorldMaterial(0)
{
  fBoxSizeXY = 50*mm;
  fBoxSizeZ = 5*mm;
  fWorldSize = 1.*m;
  SetTargetMaterial("G4_Fe");  
  SetWorldMaterial("G4_Galactic");  
  fMessenger = new DetectorMessenger(this);
}

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DetectorConstruction::~DetectorConstruction()
{ 
  delete fMessenger;
}

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  // Cleanup old geometry
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
  
  G4PolarizationManager::GetInstance()->Clean();

  // World
  //
  G4Box*
  sWorld = new G4Box("World",                            //name
                   fWorldSize/2,fWorldSize/2,fWorldSize/2); //dimensions

  G4LogicalVolume*                                                                 
  lWorld = new G4LogicalVolume(sWorld,                   //shape
                               fWorldMaterial,           //material
                              "World");                  //name

  fWorld = new G4PVPlacement(0,                          //no rotation
                             G4ThreeVector(),            //at (0,0,0)
                             lWorld,                     //logical volume
                             "World",                    //name
                             0,                          //mother volume
                             false,                      //no boolean operation
                             0);                         //copy number
                                                      
  // Box
  //                           
  G4Box*
  sBox = new G4Box("Container",                           //its name
                   fBoxSizeXY/2.,fBoxSizeXY/2.,fBoxSizeZ/2.);//its dimensions
                   
  G4LogicalVolume*
  lBox = new G4LogicalVolume(sBox,                        //its shape
                             fTargetMaterial,             //its material
                             "theBox");                   //its name

  fBox = new G4PVPlacement(0,                             //no rotation
                           G4ThreeVector(),               //at (0,0,0)
                           lBox,                          //its logical volume
                           fTargetMaterial->GetName(),    //its name
                           lWorld,                        //its mother  volume
                           false,                         //no boolean operation
                           0);                            //copy number

  // register logical Volume in PolarizationManager with zero polarization
  G4PolarizationManager * polMgr = G4PolarizationManager::GetInstance();
  polMgr->SetVolumePolarization(lBox,G4ThreeVector(0.,0.,0.));
                           
  PrintParameters();
  
  //always return the root volume
  //
  return fWorld;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n The Box is " << G4BestUnit(fBoxSizeXY,"Length")
         << " x " << G4BestUnit(fBoxSizeXY,"Length")
         << " x " << G4BestUnit(fBoxSizeZ,"Length")
         << " of " << fTargetMaterial->GetName() << G4endl;
}

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void DetectorConstruction::SetTargetMaterial(G4String materialChoice)
{
  // search the material by its name
  G4Material* mat =
    G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  if (mat != fTargetMaterial) {
    if(mat) {
      fTargetMaterial = mat;
      UpdateGeometry();
    } else {
      G4cout << "### Warning!  Target material: <"
           << materialChoice << "> not found" << G4endl;  
    }     
  }
}

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void DetectorConstruction::SetWorldMaterial(G4String materialChoice)
{
  // search the material by its name
  G4Material* mat =
    G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  if (mat != fWorldMaterial) {
    if(mat) {
      fWorldMaterial = mat;
      UpdateGeometry();
    } else {
      G4cout << "### Warning! World material: <"
           << materialChoice << "> not found" << G4endl;  
    }     
  }
}

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void DetectorConstruction::SetSizeXY(G4double value)
{
  fBoxSizeXY = value; 
  if (fWorldSize<fBoxSizeXY) fWorldSize = 1.2*fBoxSizeXY;
  UpdateGeometry();
}

void DetectorConstruction::SetSizeZ(G4double value)
{
  fBoxSizeZ = value; 
  if (fWorldSize<fBoxSizeZ) fWorldSize = 1.2*fBoxSizeZ;
  UpdateGeometry();
}

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#include "G4RunManager.hh"

void DetectorConstruction::UpdateGeometry()
{
  if (fWorld) 
    G4RunManager::GetRunManager()->DefineWorldVolume(Construct());
}

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