ExthIonisation.cxx

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// $Id: ExthIonisation.cxx,v 1.9 2022/01/26 03:16:33 wangll Exp $
// GEANT4 tag $Name: TrkExtAlg-00-00-67 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4hIonisation
//
// Author:        Laszlo Urban
//
// Creation date: 30.05.1997
//
// Modifications:
//
// corrected by L.Urban on 24/09/97
// several bugs corrected by L.Urban on 13/01/98
// 07-04-98 remove 'tracking cut' of the ionizing particle, mma
// 22-10-98 cleanup L.Urban
// 02-02-99 bugs fixed , L.Urban
// 29-07-99 correction in BuildLossTable for low energy, L.Urban
// 10-02-00 modifications , new e.m. structure, L.Urban
// 10-08-00 V.Ivanchenko change BuildLambdaTable, in order to
//          simulate energy losses of ions; correction to
//          cross section for particles with spin 1 is inserted as well
// 28-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation
// 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
// 14-08-01 new function ComputeRestrictedMeandEdx() + 'cleanup' (mma)
// 29-08-01 PostStepDoIt: correction for spin 1/2 (instead of 1) (mma)
// 17-09-01 migration of Materials to pure STL (mma)
// 25-09-01 completion of RetrievePhysicsTable() (mma)
// 29-10-01 all static functions no more inlined
// 08-11-01 Charge renamed zparticle; added to the dedx
// 27-03-02 Bug fix in scaling of lambda table (V.Ivanchenko)
// 09-04-02 Update calculation of tables for GenericIons (V.Ivanchenko)
// 30-04-02 V.Ivanchenko update to new design
// 04-12-02 Add verbose level definition (VI)
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
// 26-12-02 Secondary production moved to derived classes (V.Ivanchenko)
// 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
// 23-05-03 Define default integral + BohrFluctuations (V.Ivanchenko)
// 03-06-03 Fix initialisation problem for STD ionisation (V.Ivanchenko)
// 04-08-03 Set integral=false to be default (V.Ivanchenko)
// 08-08-03 STD substitute standard  (V.Ivanchenko)
// 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
// 27-05-04 Set integral to be a default regime (V.Ivanchenko)
// ------------------------------------------------------------------------------------
// 15-04-05 Omit the correction of momentum direction due to production of secenderies.
//          This is needed for my Track Extrapotation. (L.L.Wang)
//
// -------------------------------------------------------------------
// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
// 24-03-05 Optimize internal interfaces (V.Ivantchenko)
//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
#include "ExthIonisation.h"
#include "G4AntiProton.hh"
#include "G4BetheBlochModel.hh"
#include "G4BohrFluctuations.hh"
#include "G4BraggModel.hh"
#include "G4Electron.hh"
#include "G4PhysicalConstants.hh"
#include "G4Proton.hh"
#include "G4SystemOfUnits.hh"
#include "G4UnitsTable.hh"
#include "G4UniversalFluctuation.hh"
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
ExthIonisation::ExthIonisation( const G4String& name )
    : G4VEnergyLossProcess( name )
    , theParticle( 0 )
    , theBaseParticle( 0 )
    , isInitialised( false ) {
  SetDEDXBinning( 120 );
  // SetLambdaBinning(120);
  SetMinKinEnergy( 0.1 * keV );
  SetMaxKinEnergy( 100.0 * TeV );
  SetVerboseLevel( 0 );
  SetLossFluctuations( false );
  mass  = 0.0;
  ratio = 0.0;
}
 
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ExthIonisation::~ExthIonisation() {}
 
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void ExthIonisation::InitialiseEnergyLossProcess( const G4ParticleDefinition* part,
                                                  const G4ParticleDefinition* bpart ) {
  if ( isInitialised ) return;
 
  theParticle = part;
 
  if ( part == bpart || part == G4Proton::Proton() ) theBaseParticle = 0;
  else if ( bpart == 0 ) theBaseParticle = G4Proton::Proton();
  else theBaseParticle = bpart;
 
  SetBaseParticle( theBaseParticle );
  SetSecondaryParticle( G4Electron::Electron() );
  mass  = theParticle->GetPDGMass();
  ratio = electron_mass_c2 / mass;
 
  G4VEmModel* em = new G4BraggModel();
  em->SetLowEnergyLimit( 0.1 * keV );
  eth = 2.0 * MeV * mass / proton_mass_c2;
  em->SetHighEnergyLimit( eth );
 
  flucModel = new G4UniversalFluctuation();
 
  AddEmModel( 1, em, flucModel );
  G4VEmModel* em1 = new G4BetheBlochModel();
  em1->SetLowEnergyLimit( eth );
  em1->SetHighEnergyLimit( 100.0 * TeV );
  AddEmModel( 2, em1, flucModel );
 
  SetStepFunction( 0.2, 1.0 * mm );
 
  isInitialised = true;
}
 
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void ExthIonisation::PrintInfo() {
  G4cout << "      Bether-Bloch model for Escaled > 2 MeV, "
         << "parametrisation of Bragg peak below, "
         << "Integral mode " << IsIntegral() << G4endl;
}
 
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