Import Geant4 9.2.0 source tree

2016-06-09 15:58:43 +02:00
parent 96c8bcd0af
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+#include "G4ContinuousGainOfEnergy.hh"
+#include "G4Step.hh"
+#include "G4ParticleDefinition.hh"
+#include "G4VEmModel.hh"
+#include "G4VEmFluctuationModel.hh"
+#include "G4VParticleChange.hh"
+#include "G4UnitsTable.hh"
+
+
+///////////////////////////////////////////////////////
+//
+G4ContinuousGainOfEnergy::G4ContinuousGainOfEnergy(const G4String& name, 
+  G4ProcessType type): G4VContinuousProcess(name, type)
+{
+
+  linLossLimit=0.05;
+  lossFluctuationArePossible =true;
+  lossFluctuationFlag=true;
+  is_integral = false;
+  
+}
+
+///////////////////////////////////////////////////////
+//
+G4ContinuousGainOfEnergy::~G4ContinuousGainOfEnergy()
+{
+ 
+}
+///////////////////////////////////////////////////////
+//
+
+void G4ContinuousGainOfEnergy::PreparePhysicsTable(
+     const G4ParticleDefinition& )
+{//theDirectEnergyLossProcess->PreparePhysicsTable(part);
+
+; 
+}
+
+///////////////////////////////////////////////////////
+//
+
+void G4ContinuousGainOfEnergy::BuildPhysicsTable(const G4ParticleDefinition&)
+{//theDirectEnergyLossProcess->BuildPhysicsTable(part);
+;
+}
+
+
+
+
+///////////////////////////////////////////////////////
+//
+// 
+G4VParticleChange* G4ContinuousGainOfEnergy::AlongStepDoIt(const G4Track& track,
+                                                       const G4Step& step)
+{
+   
+  aParticleChange.Initialize(track);
+  
+  // Get the actual (true) Step length
+  //----------------------------------
+  G4double length = step.GetStepLength();
+  G4double degain  = 0.0;
+ 
+ 
+ 
+
+  // Compute this for weight change after continuous energy loss
+  //-------------------------------------------------------------
+  G4double DEDX_before = 
+  		theDirectEnergyLossProcess
+				->GetDEDX(preStepKinEnergy, currentCouple);
+ 
+ 
+  
+  // For the fluctuation we generate a new dynamic particle with energy =preEnergy+egain
+  // and then compute the fluctuation given in  the direct case.
+  //-----------------------------------------------------------------------
+  G4DynamicParticle* dynParticle = new G4DynamicParticle();
+  *dynParticle = *(track.GetDynamicParticle());
+  G4double Tkin = dynParticle->GetKineticEnergy();
+  
+  size_t n=1;
+  if (is_integral ) n=10;
+  G4double dlength= length/n; 
+  for (size_t i=0;i<n;i++) {
+  	G4double r = theDirectEnergyLossProcess->GetRange(Tkin, currentCouple);
+   	if( dlength <= linLossLimit * r ) {
+    		degain = DEDX_before*dlength;
+	} 
+  	else {
+    		G4double x = r + length;
+    		degain = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple) - theDirectEnergyLossProcess->GetKineticEnergy(r,currentCouple);
+  	}
+	G4VEmModel* currentModel =  theDirectEnergyLossProcess->SelectModelForMaterial(Tkin+degain,currentMaterialIndex);
+  	G4double tmax = currentModel->MaxSecondaryKinEnergy(dynParticle);
+ 	tmax = std::min(tmax,currentTcut);
+ 
+  
+
+  	// Sample fluctuations
+  	//-------------------
+  	
+	G4double deltaE =0.;
+  	if (lossFluctuationFlag ) {
+      		deltaE = currentModel->GetModelOfFluctuations()->
+      						SampleFluctuations(currentMaterial,dynParticle,tmax,length,degain)-degain;
+  	}
+	Tkin+=degain+deltaE;
+	dynParticle->SetKineticEnergy(Tkin);
+  	
+  }
+ 
+  
+
+  // Corrections, which cannot be tabulated 
+  // probably  this should be also changed
+  // at this time it does nothing so we can leave it
+  //CorrectionsAlongStep(currentCouple, dynParticle, egain, length);
+  
+  delete dynParticle;
+ 
+  
+  G4double DEDX_after = theDirectEnergyLossProcess->GetDEDX(Tkin, currentCouple);
+  G4double weight_correction=DEDX_after/DEDX_before; //probably not needed
+  weight_correction=1.;
+  
+  aParticleChange.ProposeEnergy(Tkin);
+  
+  //we still need to register in the particleChange the modification of the weight of the particle 
+  G4double new_weight=weight_correction*track.GetWeight();
+  aParticleChange.SetParentWeightByProcess(true);
+  aParticleChange.ProposeParentWeight(new_weight);
+  
+
+  return &aParticleChange;
+
+}
+///////////////////////////////////////////////////////
+//
+void G4ContinuousGainOfEnergy::SetLossFluctuations(G4bool val)
+{
+  if(val && !lossFluctuationArePossible) return;
+  lossFluctuationFlag = val;
+}