Import Geant4 6.0.0 source tree

2016-06-09 10:41:53 +02:00
parent 4aea781e80
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * 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.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * 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.                                    *
+// ********************************************************************
+//
+//
+// -------------------------------------------------------------------
+//      GEANT4 Class file
+//
+//      For information related to this code contact:
+//
+//      File name:     G4CrossSectionPatch
+//
+//      Author:        
+// 
+//      Creation date: 15 April 1999
+//
+//      Modifications: 
+//      
+// -------------------------------------------------------------------
+
+#include "globals.hh"
+#include "G4CrossSectionPatch.hh"
+#include "G4VCrossSectionSource.hh"
+#include "G4KineticTrack.hh"
+#include "G4CrossSectionVector.hh"
+
+G4CrossSectionPatch::G4CrossSectionPatch()
+{ }
+
+
+G4CrossSectionPatch::~G4CrossSectionPatch()
+{ }
+
+
+G4bool G4CrossSectionPatch::operator==(const G4CrossSectionPatch &right) const
+{
+  return (this == (G4CrossSectionPatch*) &right);
+}
+
+
+G4bool G4CrossSectionPatch::operator!=(const G4CrossSectionPatch &right) const
+{
+  return (this != (G4CrossSectionPatch*) &right);
+}
+
+
+G4double G4CrossSectionPatch::CrossSection(const G4KineticTrack& trk1, 
+					   const G4KineticTrack& trk2) const
+{
+  // The cross section is provided by one of the components, according to their energy
+  // validity range
+
+  G4double crossSection = 0.;
+  G4double ecm = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
+
+  const G4CrossSectionVector* components = GetComponents();
+  if (components != 0)
+    {
+      G4int nComponents = this->GetComponents()->size();
+//      G4int nValid = 0;
+      
+      G4int i;
+      for (i=0; i<nComponents; i++)
+	{
+          G4CrossSectionSourcePtr componentPtr = (*components)[i];
+	  G4VCrossSectionSource* component = componentPtr();
+	  if (component->IsValid(ecm))
+	    {
+	      crossSection = component->CrossSection(trk1,trk2);
+	    }
+	  else if (i < (nComponents - 1) )
+	    {
+	      G4CrossSectionSourcePtr nextPtr = (*components)[i+1];
+	      G4VCrossSectionSource* next = nextPtr();
+	      if (ecm > component->HighLimit() && ecm < next->LowLimit())
+		{
+		  // Merge cross-sections in transition region between two validity ranges
+		  crossSection = Transition(trk1,trk2,component,next);
+		}
+	    }
+	}
+    }
+
+  return crossSection;
+}
+
+
+G4bool G4CrossSectionPatch::IsValid(G4double e) const
+{
+  // The Patch is valid if any of its components are valid
+  G4bool answer = false;
+  const G4CrossSectionVector* components = GetComponents();
+  if (components != 0)
+    {
+      G4int n = components->size();
+      G4int i;
+      for (i=0; i<n; i++)
+	{
+	  G4CrossSectionSourcePtr componentPtr = (*components)[i];
+          G4VCrossSectionSource* component = componentPtr();
+	  if (component->IsValid(e)) 
+	    {
+	      answer = true;
+	      break;
+	    }
+	}
+    }
+  return answer;
+}
+
+
+G4double G4CrossSectionPatch::Transition(const G4KineticTrack& trk1, const G4KineticTrack& trk2,
+					      const G4VCrossSectionSource* comp1, 
+					      const G4VCrossSectionSource* comp2) const
+{
+  //Merge two cross sections in the transition region between their validity ranges
+
+  G4double crossSection = 0.;
+
+  G4double ecm = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
+  G4double sigma1 = comp1->CrossSection(trk1,trk2);
+  G4double sigma2 = comp2->CrossSection(trk1,trk2);
+  G4double denom = comp2->LowLimit() - comp1->HighLimit();
+  G4double diff = ecm - comp1->HighLimit();
+  if (denom > 0. && diff > 0.)
+    {
+      G4double ratio = diff / denom;
+      crossSection = (1.- ratio) * sigma1 + ratio * sigma2;
+    }
+
+  return crossSection;
+}
+
+
+G4double G4CrossSectionPatch::Transition(G4double ecm, 
+					 G4double sigma1, G4double sigma2, 
+					 G4double e1, G4double e2) const
+{
+  //Merge two cross sections in the transition region between their validity ranges
+
+  G4double crossSection = 0.;
+  
+  G4double denom = e2 - e1;
+  G4double diff = ecm - e1;
+  if (denom > 0. && diff > 0.)
+    {
+      G4double ratio = diff / denom;
+      crossSection = (1.- ratio) * sigma1 + ratio * sigma2;
+    }
+
+  return crossSection;
+}
+