Ex06DetectorConstruction.cxx

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//------------------------------------------------
// The Virtual Monte Carlo examples
// Copyright (C) 2007 - 2014 Ivana Hrivnacova
// All rights reserved.
//
// For the licensing terms see geant4_vmc/LICENSE.
// Contact: root-vmc@cern.ch
//-------------------------------------------------
 
/// \file Ex06DetectorConstruction.cxx
/// \brief Implementation of the Ex06DetectorConstruction class
///
/// Geant4 ExampleN03 adapted to Virtual Monte Carlo \n
/// Id: ExN06DetectorConstruction.cc,v 1.14 2004/03/17 22:41:12 gum Exp
/// GEANT4 tag Name: geant4-07-00-cand-01
///
/// \date 16/05/2005
/// \author I. Hrivnacova; IPN, Orsay
 
#include <Riostream.h>
#include <TGeoManager.h>
#include <TThread.h>
#include <TVirtualMC.h>
 
#include "Ex06DetectorConstruction.h"
 
/// \cond CLASSIMP
ClassImp(Ex06DetectorConstruction)
  /// \endcond
 
  //_____________________________________________________________________________
  Ex06DetectorConstruction::Ex06DetectorConstruction()
  : TObject(),
    fWorldSize(1500),   // 15*m
    fExpHallSize(1000), // 10*m
    fTankSize(500),     // 5*m
    fBubbleSize(50),    // 0.5*m
    fImedAir(-1),
    fImedWater(-1)
{
  /// Default constuctor
}
 
//_____________________________________________________________________________
Ex06DetectorConstruction::~Ex06DetectorConstruction()
{
  /// Destructor
}
 
//
// public methods
//
 
//_____________________________________________________________________________
void Ex06DetectorConstruction::ConstructMaterials()
{
  /// Construct materials using TGeo modeller
 
  // Create Root geometry manager
  new TGeoManager("E06_geometry", "E06 VMC example geometry");
 
  Double_t a;       // Mass of a mole in g/mole
  Double_t z;       // Atomic number
  Double_t density; // Material density in g/cm3
 
  // Elements
 
  TGeoElement* elH = new TGeoElement("Hydrogen", "H", z = 1, a = 1.01);
  TGeoElement* elN = new TGeoElement("Nitrogen", "N", z = 7., a = 14.01);
  TGeoElement* elO = new TGeoElement("Oxygen", "O", z = 8., a = 16.00);
 
  // Materials
 
  TGeoMixture* matAir = new TGeoMixture("Air", 2, density = 1.29e-03);
  matAir->AddElement(elN, 0.7);
  matAir->AddElement(elO, 0.3);
 
  TGeoMixture* matH2O = new TGeoMixture("Water", 2, density = 1.000);
  matH2O->AddElement(elH, 2);
  matH2O->AddElement(elO, 1);
 
  // Tracking media
 
  Double_t param[20];
  param[0] = 0;     // isvol  - Not used
  param[1] = 2;     // ifield - User defined magnetic field
  param[2] = 10.;   // fieldm - Maximum field value (in kiloGauss)
  param[3] = -20.;  // tmaxfd - Maximum angle due to field deflection
  param[4] = -0.01; // stemax - Maximum displacement for multiple scat
  param[5] = -.3;   // deemax - Maximum fractional energy loss, DLS
  param[6] = .001;  // epsil - Tracking precision
  param[7] = -.8;   // stmin
  for (Int_t i = 8; i < 20; ++i) param[i] = 0.;
 
  fImedAir = 1;
  new TGeoMedium("Air", fImedAir, matAir, param);
 
  fImedWater = 2;
  new TGeoMedium("Water", fImedWater, matH2O, param);
}
 
//_____________________________________________________________________________
void Ex06DetectorConstruction::ConstructGeometry()
{
  /// Contruct volumes using TGeo modeller
 
  // The world
  //
  Double_t* ubuf = 0;
 
  Double_t world[3];
  world[0] = fWorldSize;
  world[1] = fWorldSize;
  world[2] = fWorldSize;
  TGeoVolume* worldV = gGeoManager->Volume("WRLD", "BOX", fImedAir, world, 3);
  gGeoManager->SetTopVolume(worldV);
 
  // The experimental Hall
  //
  Double_t expHall[3];
  expHall[0] = fExpHallSize;
  expHall[1] = fExpHallSize;
  expHall[2] = fExpHallSize;
  gGeoManager->Volume("EXPH", "BOX", fImedAir, expHall, 3);
 
  Double_t posX = 0.;
  Double_t posY = 0.;
  Double_t posZ = 0.;
  gGeoManager->Node("EXPH", 1, "WRLD", posX, posY, posZ, 0, kTRUE, ubuf);
 
  // The Water Tank
  //
  Double_t waterTank[3];
  waterTank[0] = fTankSize;
  waterTank[1] = fTankSize;
  waterTank[2] = fTankSize;
  gGeoManager->Volume("TANK", "BOX", fImedWater, waterTank, 3);
  gGeoManager->Node("TANK", 1, "EXPH", posX, posY, posZ, 0, kTRUE, ubuf);
 
  // The Air Bubble
  //
  Double_t bubbleAir[3];
  bubbleAir[0] = fBubbleSize;
  bubbleAir[1] = fBubbleSize;
  bubbleAir[2] = fBubbleSize;
  gGeoManager->Volume("BUBL", "BOX", fImedAir, bubbleAir, 3);
 
  posX = 0.;
  posY = 250.;
  posZ = 0.;
  gGeoManager->Node("BUBL", 1, "TANK", posX, posY, posZ, 0, kTRUE, ubuf);
 
  // close geometry
  gGeoManager->CloseGeometry();
 
  // notify VMC about Root geometry
  gMC->SetRootGeometry();
}
 
//_____________________________________________________________________________
void Ex06DetectorConstruction::ConstructOpGeometry()
{
  /// Define material optical properties
 
  // ------------ Generate & Add Material Properties Table ------------
  //
 
  fImedAir = gMC->MediumId("Air");
  fImedWater = gMC->MediumId("Water");
 
  const Int_t nEntries = 32;
  Bool_t spline = true;
  Bool_t noSpline = false;
 
  // clang-format off
 
  Double_t photonEnergy[nEntries] = {
    2.034e-09, 2.068e-09, 2.103e-09, 2.139e-09, 2.177e-09, 2.216e-09,
    2.256e-09, 2.298e-09, 2.341e-09, 2.386e-09, 2.433e-09, 2.481e-09,
    2.532e-09, 2.585e-09, 2.640e-09, 2.697e-09, 2.757e-09, 2.820e-09,
    2.885e-09, 2.954e-09, 3.026e-09, 3.102e-09, 3.181e-09, 3.265e-09,
    3.353e-09, 3.446e-09, 3.545e-09, 3.649e-09, 3.760e-09, 3.877e-09,
    4.002e-09, 4.136e-09};
 
  // Water
  Double_t refractiveIndex1[nEntries] = {
    1.3435, 1.344,  1.3445, 1.345,  1.3455, 1.346,  1.3465, 1.347,
    1.3475, 1.348,  1.3485, 1.3492, 1.35,   1.3505, 1.351,  1.3518,
    1.3522, 1.3530, 1.3535, 1.354,  1.3545, 1.355,  1.3555, 1.356,
    1.3568, 1.3572, 1.358,  1.3585, 1.359,  1.3595, 1.36,   1.3608};
 
  Double_t absorption1[nEntries] = {
    3.448e02,  4.082e02,  6.329e02,  9.174e02,  12.346e02, 13.889e02,
    15.152e02, 17.241e02, 18.868e02, 20.000e02, 26.316e02, 35.714e02,
    45.455e02, 47.619e02, 52.632e02, 52.632e02, 55.556e02, 52.632e02,
    52.632e02, 47.619e02, 45.455e02, 41.667e02, 37.037e02, 33.333e02,
    30.000e02, 28.500e02, 27.000e02, 24.500e02, 22.000e02, 19.500e02,
    17.500e02, 14.500e02};
 
  // Added (for Geant3)
  Double_t efficiency1[nEntries] = { 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00,
    0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00,
    0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00,
    0.00 };
 
  gMC->SetCerenkov(fImedWater, nEntries, photonEnergy, absorption1, efficiency1,
    refractiveIndex1, spline, noSpline);
 
  Double_t scintilFast[2] = { 1.00, 1.00,};
  Double_t energyArray[2] = { 2.034e-09, 4.136e-09 };
  Int_t lenArray = 2;
 
  Double_t scintilSlow[nEntries] = {
    0.01, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 8.00,
    7.00, 6.00, 4.00, 3.00, 2.00, 1.00, 0.01, 1.00, 2.00, 3.00, 4.00,
    5.00, 6.00, 7.00, 8.00, 9.00, 8.00, 7.00, 6.00, 5.00, 4.00};
 
  gMC->SetMaterialProperty(
    fImedWater, "SCINTILLATIONCOMPONENT1", lenArray, energyArray, scintilFast,
    false, spline);
  gMC->SetMaterialProperty(
    fImedWater, "SCINTILLATIONCOMPONENT2", nEntries, photonEnergy, scintilSlow,
    false, spline);
 
  gMC->SetMaterialProperty(fImedWater, "SCINTILLATIONYIELD", 50.e03); // 50./MeV
  gMC->SetMaterialProperty(fImedWater, "RESOLUTIONSCALE", 1.0);
  gMC->SetMaterialProperty(fImedWater, "SCINTILLATIONTIMECONSTANT1", 1.0e-09);  // 1.*ns
  gMC->SetMaterialProperty(fImedWater, "SCINTILLATIONTIMECONSTANT2", 10.0e-09); // 10.*ns
  gMC->SetMaterialProperty(fImedWater, "SCINTILLATIONYIELD1", 0.8);
  gMC->SetMaterialProperty(fImedWater, "SCINTILLATIONYIELD2", 0.2);
 
  const Int_t nEntriesWater = 60;
 
  Double_t energyWater[nEntriesWater] = {
    1.56962e-09, 1.58974e-09, 1.61039e-09, 1.63157e-09, 1.65333e-09,
    1.67567e-09, 1.69863e-09, 1.72222e-09, 1.74647e-09, 1.77142e-09,
    1.7971e-09,  1.82352e-09, 1.85074e-09, 1.87878e-09, 1.90769e-09,
    1.93749e-09, 1.96825e-09, 1.99999e-09, 2.03278e-09, 2.06666e-09,
    2.10169e-09, 2.13793e-09, 2.17543e-09, 2.21428e-09, 2.25454e-09,
    2.29629e-09, 2.33962e-09, 2.38461e-09, 2.43137e-09, 2.47999e-09,
    2.53061e-09, 2.58333e-09, 2.63829e-09, 2.69565e-09, 2.75555e-09,
    2.81817e-09, 2.88371e-09, 2.95237e-09, 3.02438e-09, 3.09999e-09,
    3.17948e-09, 3.26315e-09, 3.35134e-09, 3.44444e-09, 3.54285e-09,
    3.64705e-09, 3.75757e-09, 3.87499e-09, 3.99999e-09, 4.13332e-09,
    4.27585e-09, 4.42856e-09, 4.59258e-09, 4.76922e-09, 4.95999e-09,
    5.16665e-09, 5.39129e-09, 5.63635e-09, 5.90475e-09, 6.19998e-09};
 
  // assume 100 times larger than the rayleigh scattering for now.
  Double_t mieWater[nEntriesWater] = {
    167024.4e02, 158726.7e02, 150742e02,   143062.5e02, 135680.2e02,
    128587.4e02, 121776.3e02, 115239.5e02, 108969.5e02, 102958.8e02,
    97200.35e02, 91686.86e02, 86411.33e02, 81366.79e02, 76546.42e02,
    71943.46e02, 67551.29e02, 63363.36e02, 59373.25e02, 55574.61e02,
    51961.24e02, 48527.00e02, 45265.87e02, 42171.94e02, 39239.39e02,
    36462.50e02, 33835.68e02, 31353.41e02, 29010.30e02, 26801.03e02,
    24720.42e02, 22763.36e02, 20924.88e02, 19200.07e02, 17584.16e02,
    16072.45e02, 14660.38e02, 13343.46e02, 12117.33e02, 10977.70e02,
    9920.416e02, 8941.407e02, 8036.711e02, 7202.470e02, 6434.927e02,
    5730.429e02, 5085.425e02, 4496.467e02, 3960.210e02, 3473.413e02,
    3032.937e02, 2635.746e02, 2278.907e02, 1959.588e02, 1675.064e02,
    1422.710e02, 1200.004e02, 1004.528e02, 833.9666e02, 686.1063e02};
 
  // gforward, gbackward, forward backward ratio
  Double_t mieWaterConst[3] = { 0.99, 0.99, 0.8 };
 
  gMC->SetMaterialProperty(
    fImedWater, "MIEHG", nEntriesWater, energyWater, mieWater, false, true);
  gMC->SetMaterialProperty(fImedWater, "MIEHG_FORWARD", mieWaterConst[0]);
  gMC->SetMaterialProperty(fImedWater, "MIEHG_BACKWARD", mieWaterConst[1]);
  gMC->SetMaterialProperty(fImedWater, "MIEHG_FORWARD_RATIO", mieWaterConst[2]);
 
  // Set the Birks Constant for the Water scintillator
  gMC->SetMaterialProperty(
    fImedWater, "BIRKS_CONSTANT", 0.126e+02); // 0.126*mm/MeV
 
  // Air
 
  Double_t refractiveIndex2[nEntries] = {
    1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0,
    1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0,
    1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0,
    1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0,
    1.0, 1.0, 1.0, 1.0};
 
  gMC->SetMaterialProperty(
    fImedAir, "RINDEX", nEntries, photonEnergy, refractiveIndex2);
 
  //    ------------- Surfaces --------------
  //
  // Water Tank
  //
  gMC->DefineOpSurface(
    "WaterSurface", kDAVIS, kDielectric_LUTDAVIS, kRough_LUT, 1.0);
  // gMC->DefineOpSurface(
  //   "WaterSurface", kUnified, kDielectric_dielectric, kGround, 1.0);
  gMC->SetBorderSurface("WaterSurface", "TANK", 1, "EXPH", 1, "WaterSurface");
  // the world copyNo is in VMC always 1
 
  // Air Bubble
  //
  gMC->DefineOpSurface(
    "AirSurface", kGlisur, kDielectric_dielectric, kPolished, 1.0);
  gMC->SetSkinSurface("AirSurface", "BUBL", "AirSurface");
 
  //
  // Generate & Add Material Properties Table attached to the optical surfaces
  //
  const Int_t num = 2;
  Double_t ephoton[num] = { 2.034e-09, 4.136e-09 };
  // OpticalAirSurface
  Double_t reflectivity[num] = { 0.3, 0.5 };
  Double_t efficiency[num] = { 0.8, 1.0 };
  gMC->SetMaterialProperty(
    "AirSurface", "REFLECTIVITY", num, ephoton, reflectivity);
  gMC->SetMaterialProperty(
    "AirSurface", "EFFICIENCY", num, ephoton, efficiency);
}