Import Geant4 9.5.0 source tree

source/processes/electromagnetic/standard/src/G4eSingleCoulombScatteringModel.cc

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+//
+// ********************************************************************
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+// *                                                                  *
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+// ********************************************************************
+//
+//	G4eSingleCoulombScatteringModel.cc
+// -------------------------------------------------------------------
+//
+// GEANT4 Class header file
+//
+// File name:    G4eSingleCoulombScatteringModel
+//
+// Author:      Cristina Consolandi
+//
+// Creation date: 20.10.2012  
+//                           
+//	Class Description:
+//	Single Scattering model for electron-nuclei interaction.
+//	Suitable for high energy electrons and low scattering angles.
+//
+//
+//	 Reference:
+//	M.J. Boschini et al.
+//	"Non Ionizing Energy Loss induced by Electrons in the Space Environment"
+//	Proc. of the 13th International Conference on Particle Physics and Advanced Technology 
+//	(13th ICPPAT, Como 3-7/10/2011), World Scientific (Singapore).
+//
+// -------------------------------------------------------------------
+//
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+
+#include "G4eSingleCoulombScatteringModel.hh"
+#include "Randomize.hh"
+#include "G4ParticleChangeForGamma.hh"
+#include "G4Proton.hh"
+#include "G4ProductionCutsTable.hh"
+#include "G4NucleiProperties.hh"
+
+#include "G4UnitsTable.hh"
+
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+using namespace std;
+
+G4eSingleCoulombScatteringModel::G4eSingleCoulombScatteringModel(const G4String& nam)
+  : G4VEmModel(nam),
+
+    cosThetaMin(1.0),
+    isInitialised(false)
+{
+  	fNistManager = G4NistManager::Instance();
+  	theParticleTable = G4ParticleTable::GetParticleTable();
+	fParticleChange = 0;
+
+	pCuts=0;
+  	currentMaterial = 0;
+  	currentElement  = 0;
+        currentCouple = 0;
+
+        lowEnergyLimit  = 0*eV;
+  	recoilThreshold = 0.*eV;
+  	particle = 0;
+	mass=0;
+	currentMaterialIndex = -1;
+
+  	McFcross = new G4ScreeningMottCrossSection(); 
+
+}
+
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4eSingleCoulombScatteringModel::~G4eSingleCoulombScatteringModel()
+{ delete  McFcross;}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+void G4eSingleCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
+                                           const G4DataVector&  )
+{
+  	SetupParticle(p);
+  	currentCouple = 0;
+	currentMaterialIndex = -1;
+  	cosThetaMin = cos(PolarAngleLimit());
+  	McFcross->Initialise(p,cosThetaMin);
+ 
+        pCuts = G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
+
+
+  	if(!isInitialised) {
+	  isInitialised = true;
+	  fParticleChange = GetParticleChangeForGamma();
+	}
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+G4double G4eSingleCoulombScatteringModel::ComputeCrossSectionPerAtom(
+                                const G4ParticleDefinition* p,
+				G4double kinEnergy, 
+				G4double Z, 
+				G4double , 
+				G4double, 
+				G4double )
+{
+
+  	SetupParticle(p);
+ 
+  	G4double xsec =0.0;
+	if(kinEnergy < lowEnergyLimit) return xsec;
+
+  	DefineMaterial(CurrentCouple());
+
+	//Total Cross section
+        McFcross->SetupKinematic(kinEnergy, Z);
+  	xsec = McFcross->NuclearCrossSection();
+
+	//cout<< "....xsec "<<G4BestUnit(xsec,"Surface") << " cm2 "<< xsec/cm2 <<endl;
+  return xsec;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+void G4eSingleCoulombScatteringModel::SampleSecondaries(
+			       std::vector<G4DynamicParticle*>* fvect,
+			       const G4MaterialCutsCouple* couple,
+			       const G4DynamicParticle* dp,
+			       G4double cutEnergy, 
+			       G4double)
+{
+  	G4double kinEnergy = dp->GetKineticEnergy();
+	//cout<<"--- kinEnergy "<<kinEnergy<<endl;
+
+
+  	if(kinEnergy < lowEnergyLimit) return;
+	
+  	DefineMaterial(couple);
+  	SetupParticle(dp->GetDefinition());
+
+	// Choose nucleus
+  	currentElement = SelectRandomAtom(couple,particle,
+                                    kinEnergy,cutEnergy,kinEnergy);//last two :cutEnergy= min e kinEnergy=max
+
+	G4double Z  = currentElement->GetZ();
+  	G4int iz    = G4int(Z);
+  	G4int ia = SelectIsotopeNumber(currentElement);
+
+	G4double xsec= McFcross->GetTotalCross();
+
+
+	if(xsec == 0.0)return;
+    		
+  	G4ThreeVector dir = dp->GetMomentumDirection(); //old direction
+	G4ThreeVector newDirection=McFcross->GetNewDirection();//new direction
+  	newDirection.rotateUz(dir);   
+  
+	fParticleChange->ProposeMomentumDirection(newDirection);   
+  
+	//Recoil energy
+	G4double trec= McFcross->GetTrec();
+	//Energy after scattering	
+        G4double finalT = kinEnergy - trec;
+
+
+  	if(finalT <= lowEnergyLimit) { 
+    		trec = kinEnergy;  
+    		finalT = 0.0;
+  		} 
+    
+  	fParticleChange->SetProposedKineticEnergy(finalT);
+
+  	G4double tcut = recoilThreshold;
+        if(pCuts) { tcut= std::min(tcut,(*pCuts)[currentMaterialIndex]); 
+		}
+ 
+
+  	if(trec > tcut) {
+
+		//cout<<"Trec "<<trec/eV<<endl;
+    		G4ParticleDefinition* ion = theParticleTable->GetIon(iz, ia, 0.0);
+
+		//incident before scattering
+		G4double ptot=sqrt(McFcross->GetMom2Lab());
+		//incident after scattering
+    		G4double plab = sqrt(finalT*(finalT + 2.0*mass));
+    		G4ThreeVector p2 = (ptot*dir - plab*newDirection).unit();
+		//secondary particle
+    		G4DynamicParticle* newdp  = new G4DynamicParticle(ion, p2, trec);
+    			fvect->push_back(newdp);
+  			}
+
+	else if(trec > 0.0) {
+                fParticleChange->ProposeNonIonizingEnergyDeposit(trec);
+   		if(trec< tcut) fParticleChange->ProposeLocalEnergyDeposit(trec);
+  		}
+
+
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+