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)
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
#include "TrkExtAlg/ExthIonisation.h"
#include "G4Electron.hh"
#include "G4Proton.hh"
#include "G4AntiProton.hh"
#include "G4BraggModel.hh"
#include "G4BetheBlochModel.hh"
#include "G4UniversalFluctuation.hh"
#include "G4BohrFluctuations.hh"
#include "G4UnitsTable.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.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;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
ExthIonisation::~ExthIonisation()
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
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;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void ExthIonisation::PrintInfo()
{
  G4cout << "      Bether-Bloch model for Escaled > 2 MeV, "
         << "parametrisation of Bragg peak below, "
         << "Integral mode " << IsIntegral()
         << G4endl;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....