Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: ExN05EMShowerModel.cc,v 2.4 1998/12/10 04:07:39 verderi Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+#include "ExN05EMShowerModel.hh"
+#include "ExN05EnergySpot.hh"
+
+#include "RandomGamma.hh"
+#include "Randomize.hh"
+
+#include "G4Electron.hh"
+#include "G4Positron.hh"
+#include "G4Gamma.hh"
+#include "G4TransportationManager.hh"
+#include "G4VSensitiveDetector.hh"
+#include "G4VTouchable.hh"
+
+ExN05EMShowerModel::ExN05EMShowerModel(G4String modelName, G4LogicalVolume* envelope)
+: G4VFastSimulationModel(modelName, envelope)
+{
+  fFakeStep          = new G4Step();
+  fFakePreStepPoint  = fFakeStep->GetPreStepPoint();
+  fFakePostStepPoint = fFakeStep->GetPostStepPoint();
+  fpTouchable = new G4TouchableHistory();
+  fpNavigator = new G4Navigator();
+  fNaviSetup  = false;
+}
+
+ExN05EMShowerModel::ExN05EMShowerModel(G4String modelName)
+: G4VFastSimulationModel(modelName)
+{
+  fFakeStep          = new G4Step();
+  fFakePreStepPoint  = fFakeStep->GetPreStepPoint();
+  fFakePostStepPoint = fFakeStep->GetPostStepPoint();
+  fpTouchable = new G4TouchableHistory();
+  fpNavigator = new G4Navigator();
+  fNaviSetup  = false;
+}
+
+ExN05EMShowerModel::~ExN05EMShowerModel()
+{
+  delete fFakeStep;
+  delete fpTouchable;
+  delete fpNavigator;
+}
+
+G4bool ExN05EMShowerModel::IsApplicable(const G4ParticleDefinition& particleType)
+{
+  return 
+    &particleType == G4Electron::ElectronDefinition() ||
+    &particleType == G4Positron::PositronDefinition() ||
+    &particleType == G4Gamma::GammaDefinition();
+}
+
+G4bool ExN05EMShowerModel::ModelTrigger(const G4FastTrack& fastTrack)
+{
+  // Applies the parameterisation above 100 MeV:
+  return fastTrack.GetPrimaryTrack()->GetKineticEnergy() > 100*MeV;
+}
+
+void ExN05EMShowerModel::DoIt(const G4FastTrack& fastTrack, 
+		     G4FastStep& fastStep)
+{
+  // Kill the parawmeterised particle:
+  fastStep.KillPrimaryTrack();
+  fastStep.SetPrimaryTrackPathLength(0.0);
+  fastStep.SetTotalEnergyDeposited(fastTrack.GetPrimaryTrack()->GetKineticEnergy());
+
+  // split into "energy spots" energy according to the shower shape:
+  Explode(fastTrack);
+  
+  // and put those energy spots into the crystals:
+  BuildDetectorResponse();
+  
+}
+
+void ExN05EMShowerModel::Explode(const G4FastTrack& fastTrack)
+{
+  //-----------------------------------------------------
+  //
+  //-----------------------------------------------------
+
+  // Reduced quantities:
+  // -- critical energy in CsI:
+  G4double Ec     = 800*MeV/(54. + 1.2); // 54 = mean Z of CsI
+  G4double Energy = fastTrack.GetPrimaryTrack()->GetKineticEnergy();
+  G4double y      = Energy/Ec;
+
+  // compute value of parameter "a" of longitudinal profile, b assumed = 0.5
+  G4double a, tmax, b(0.5), C;
+  if (fastTrack.GetPrimaryTrack()->GetDefinition() == G4Gamma::GammaDefinition()) C = 0.5;
+  else C = -0.5;
+  tmax = 1.0 * (log(y) + C);
+  a    = 1.0 + b*tmax;
+
+  // t : reduced quantity = z/X0:
+  G4double    t, bt;
+  G4Material* CsI = G4Material::GetMaterial("CsI");
+  G4double    X0  = CsI->GetRadlen();
+  // Moliere radius:
+  G4double Es = 21*MeV;
+  G4double Rm = X0*Es/Ec;
+
+  // axis of the shower, in global reference frame:
+  G4ThreeVector xShower, yShower, zShower;
+  zShower = fastTrack.GetPrimaryTrack()->GetMomentumDirection();
+  xShower = zShower.orthogonal();
+  yShower = zShower.cross(xShower);
+  // starting point of the shower:
+  G4ThreeVector sShower = fastTrack.GetPrimaryTrack()->GetPosition();
+
+  // We shoot 100 spots of energy:
+  G4int    nSpots  = 100;
+  G4double deposit = Energy/double(nSpots);
+  ExN05EnergySpot eSpot;
+  eSpot.SetEnergy(deposit);
+  G4ThreeVector ePoint;
+  G4double z, r, phi;
+
+  feSpotList.clear();
+  for (int i = 0; i < nSpots; i++)
+    {
+      // Longitudinal profile:
+      // -- shoot z according to Gamma distribution:
+      bt = RandomGamma(a);
+      t  = bt/b;
+      z  = t*X0;
+      
+      // transverse profile:
+      // we set 90% of energy in one Rm,
+      // the rest between 1 and 3.5 Rm:
+      G4double xr = G4UniformRand();
+      if (xr < 0.9) r = xr/0.9*Rm;
+      else r = ((xr - 0.9)/0.1*2.5 + 1.0)*Rm;
+      phi = G4UniformRand()*twopi;
+
+      // build the position:
+      ePoint = sShower +
+	z*zShower +
+	r*cos(phi)*xShower + r*sin(phi)*yShower;
+      
+      // and the energy spot:
+      eSpot.SetPosition(ePoint);
+
+      // Records the eSpot:
+      feSpotList.insert(eSpot);
+    }
+}
+
+
+void ExN05EMShowerModel::BuildDetectorResponse()
+{
+  // Does the assignation of the energy spots to the sensitive volumes:
+  for (int i = 0; i < feSpotList.entries(); i++)
+    {
+      // Draw the energy spot:
+      feSpotList[i].Draw();
+      //      feSpotList[i].Print();
+      
+      // "converts" the energy spot into the fake
+      // G4Step to pass to sensitive detector:
+      AssignSpotAndCallHit(feSpotList[i]);
+    }
+}
+
+
+void ExN05EMShowerModel::AssignSpotAndCallHit(const ExN05EnergySpot &eSpot)
+{
+  //
+  // "converts" the energy spot into the fake
+  // G4Step to pass to sensitive detector:
+  //
+  FillFakeStep(eSpot);
+
+  //
+  // call sensitive part: taken/adapted from the stepping:
+  // Send G4Step information to Hit/Dig if the volume is sensitive
+  //
+  G4VPhysicalVolume* pCurrentVolume = 
+    fFakeStep->GetPreStepPoint()->GetPhysicalVolume();
+  G4VSensitiveDetector* pSensitive;
+  
+  if( pCurrentVolume != 0 )
+    {
+      pSensitive = pCurrentVolume->GetLogicalVolume()->
+	GetSensitiveDetector();
+      if( pSensitive != 0 )
+	{
+	  pSensitive->Hit(fFakeStep);
+	}
+    }
+}
+
+
+void ExN05EMShowerModel::FillFakeStep(const ExN05EnergySpot &eSpot)
+{
+  //-----------------------------------------------------------
+  // find in which volume the spot is.
+  //-----------------------------------------------------------
+  if (!fNaviSetup)
+    {
+      fpNavigator->
+	SetWorldVolume(G4TransportationManager::GetTransportationManager()->
+		       GetNavigatorForTracking()->GetWorldVolume());
+      fpNavigator->
+	LocateGlobalPointAndUpdateTouchable(eSpot.GetPosition(),
+					    fpTouchable,
+					    false);
+      fNaviSetup = true;
+    }
+  else
+    {
+      fpNavigator->
+	LocateGlobalPointAndUpdateTouchable(eSpot.GetPosition(),
+					    fpTouchable);
+     }
+  //--------------------------------------
+  // Fills attribute of the G4Step needed
+  // by our sensitive detector:
+  //-------------------------------------
+  // set touchable volume at PreStepPoint:
+  fFakePreStepPoint->SetTouchable(fpTouchable);
+  // set total energy deposit:
+  fFakeStep->SetTotalEnergyDeposit(eSpot.GetEnergy());
+}
+
+
+
+
+
+