Import Geant4 3.0.0 source tree

2016-06-08 15:55:53 +02:00
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+// 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:
+// Geant4 Collaboration
+//
+// File name:     G4IonYangFluctuationModel
+//
+// Author:        V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
+// 
+// Creation date: 18 August 2000
+//
+// Modifications: 
+// 18/08/2000  V.Ivanchenko First implementation
+// 04/09/2000  V.Ivanchenko Rename fluctuations            
+// 03/10/2000  V.Ivanchenko CodeWizard clean up
+//
+// -------------------------------------------------------------------
+// Class Description: 
+//
+// The aproximation of additional ion energy loss fluctuations 
+// Q.Yang et al., NIM B61(1991)149-155.
+//
+// Class Description: End 
+//
+// -------------------------------------------------------------------
+//
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+#include "G4IonYangFluctuationModel.hh"
+#include "G4DynamicParticle.hh"
+#include "G4ParticleDefinition.hh"
+#include "G4Material.hh"
+#include "globals.hh"
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4IonYangFluctuationModel::G4IonYangFluctuationModel(const G4String& name)
+  : G4VLowEnergyModel(name)
+{;}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4IonYangFluctuationModel::~G4IonYangFluctuationModel() 
+{;}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4IonYangFluctuationModel::TheValue(const G4DynamicParticle* particle,
+                	                    const G4Material* material) 
+{
+  G4double energy = particle->GetKineticEnergy() ;
+  G4double mass = particle->GetMass() ;
+  G4double charge = (particle->GetCharge())/eplus ;
+
+  G4double q = YangFluctuationModel(material,energy,mass,charge) ;
+
+  return q ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4IonYangFluctuationModel::TheValue(
+                                   const G4ParticleDefinition* aParticle,
+       		                   const G4Material* material,
+                                         G4double kineticEnergy) 
+{
+  G4double mass = aParticle->GetPDGMass() ;
+  G4double charge = (aParticle->GetPDGCharge())/eplus ;
+
+  G4double q = YangFluctuationModel(material,kineticEnergy,mass,charge);
+
+  return q ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4IonYangFluctuationModel::HighEnergyLimit(
+                             const G4ParticleDefinition* aParticle,
+                             const G4Material* material) const
+{
+  return 1.0*TeV ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4IonYangFluctuationModel::LowEnergyLimit(
+                              const G4ParticleDefinition* aParticle,
+                              const G4Material* material) const
+{
+  return 0.0 ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4IonYangFluctuationModel::HighEnergyLimit(
+                              const G4ParticleDefinition* aParticle) const
+{
+  return 1.0*TeV ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4IonYangFluctuationModel::LowEnergyLimit(
+                              const G4ParticleDefinition* aParticle) const
+{
+  return 0.0 ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+ 
+G4bool G4IonYangFluctuationModel::IsInCharge(
+                                  const G4DynamicParticle* particle,
+    		                  const G4Material* material) const
+{
+  return true ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+ 
+G4bool G4IonYangFluctuationModel::IsInCharge(
+                                  const G4ParticleDefinition* aParticle,
+      		                  const G4Material* material) const
+{
+  return true ;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4IonYangFluctuationModel::YangFluctuationModel(
+                                    const G4Material* material,
+                                          G4double kineticEnergy,
+                                          G4double particleMass,
+                                          G4double charge) const
+{
+  // The aproximation of energy loss fluctuations 
+  // Q.Yang et al., NIM B61(1991)149-155.
+
+  // Reduced energy in MeV/AMU
+  G4double energy = kineticEnergy *amu_c2/(particleMass*MeV) ;
+
+  G4int i = 0 ;
+  G4double factor = 1.0 ;
+
+  // The index of set of parameters i = 0 for protons(hadrons) in gases
+  //                                    1 for protons(hadrons) in solids
+  //                                    2 for ions in atomic gases
+  //                                    3 for ions in molecular gases
+  //                                    4 for ions in solids
+  static G4double b[5][4] = {
+  0.1014,  0.3700,  0.9642,  3.987,
+  0.1955,  0.6941,  2.522,   1.040,
+  0.05058, 0.08975, 0.1419, 10.80,
+  0.05009, 0.08660, 0.2751,  3.787,
+  0.01273, 0.03458, 0.3951,  3.812
+  } ;
+
+  // protons (hadrons) 
+  if(1.5 > charge) {
+    if( kStateGas != material->GetState() ) i = 1 ;
+
+  // ions
+  } else {
+    G4double zeff = (material->GetElectronDensity())/
+                    (material->GetTotNbOfAtomsPerVolume()) ;
+    factor = charge * pow(charge/zeff, 0.3333) ;
+
+    if( kStateGas == material->GetState() ) {
+      energy /= (charge * sqrt(charge)) ;      
+
+      if(1 == (material->GetNumberOfElements())) {
+        i = 2 ;
+      } else {
+        i = 3 ;
+      }
+
+    } else {
+      energy /= (charge * sqrt(charge*zeff)) ;      
+      i = 4 ;
+    }
+  }
+
+  G4double x = b[i][2] * (1.0 - exp( - energy * b[i][3] )) ;
+
+  G4double q = factor * x * b[i][0] / 
+             ((energy - b[i][1])*(energy - b[i][1]) + x*x) ;
+
+  return q ;    
+}
+
+
+
+
+
+