G4hhIonisation.cc

Go to the documentation of this file.

//
// ********************************************************************
// * 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.          *
// ********************************************************************
//
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4hhIonisation
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 30.09.2005
//
// Modifications:
// 10-01-06 SetStepLimits -> SetStepFunction (V.Ivantchenko)
// 27-10-06 Add maxKinEnergy (V.Ivantchenko)
//
//
// -------------------------------------------------------------------
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
#include "G4hhIonisation.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4BraggNoDeltaModel.hh"
#include "G4BetheBlochNoDeltaModel.hh"
#include "G4ICRU73NoDeltaModel.hh"
#include "G4UniversalFluctuation.hh"
#include "G4IonFluctuations.hh"
#include "G4UnitsTable.hh"
#include "G4Electron.hh"
#include "G4EmParameters.hh"
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4hhIonisation::G4hhIonisation(const G4String& name)
  : G4VEnergyLossProcess(name)
{
  SetVerboseLevel(1);
  SetProcessSubType(fIonisation);
  SetSecondaryParticle(G4Electron::Electron());
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4hhIonisation::~G4hhIonisation()
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4bool G4hhIonisation::IsApplicable(const G4ParticleDefinition& p)
{
  return (p.GetPDGCharge() != 0.0);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double G4hhIonisation::MinPrimaryEnergy(const G4ParticleDefinition*,
                      const G4Material*,
                      G4double cut)
{
  G4double x = 0.5*cut/electron_mass_c2;
  G4double y = electron_mass_c2/mass;
  G4double gam = x*y + std::sqrt((1. + x)*(1. + x*y*y));
  return mass*(gam - 1.0);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4hhIonisation::InitialiseEnergyLossProcess(
         const G4ParticleDefinition* part,
         const G4ParticleDefinition* bpart)
{
  if(isInitialised) { return; }
 
  theParticle = part;
  if(nullptr != bpart) { 
    G4cout << "G4hhIonisation::InitialiseEnergyLossProcess WARNING: no "
       << "base particle should be defined for the process "
       << GetProcessName() << G4endl; 
  }
  mass  = theParticle->GetPDGMass();
  ratio = electron_mass_c2/mass;
  G4double eth = 2*CLHEP::MeV*mass/proton_mass_c2;
  flucModel = new G4IonFluctuations();
 
  G4EmParameters* param = G4EmParameters::Instance();
  G4double emin = std::min(param->MinKinEnergy(), 0.1*eth);
  G4double emax = std::max(param->MaxKinEnergy(), 100*eth);
 
  SetMinKinEnergy(emin);
  SetMaxKinEnergy(emax);
  G4int bin = G4lrint(param->NumberOfBinsPerDecade()*std::log10(emax/emin));
  SetDEDXBinning(bin);
 
  G4VEmModel* em = EmModel(0); 
  if (nullptr == em) { 
    if(part->GetPDGCharge() > 0.0) { em = new G4BraggNoDeltaModel(); }
    else { em = new G4ICRU73NoDeltaModel(); }
  }
  em->SetLowEnergyLimit(emin);
  em->SetHighEnergyLimit(eth);
  AddEmModel(1, em, flucModel);
 
  em = EmModel(1);
  if(nullptr == em) { em = new G4BetheBlochNoDeltaModel(); }
  em->SetLowEnergyLimit(eth);
  em->SetHighEnergyLimit(emax);
  AddEmModel(1, em, flucModel);
 
  if(verboseLevel>1) {
    G4cout << "G4hhIonisation is initialised" << G4endl;
  }
  isInitialised = true;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4hhIonisation::ProcessDescription(std::ostream& out) const
{
  out << "G4hhIonisation: no delta rays" << G4endl;
  G4VEnergyLossProcess::ProcessDescription(out);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....