ExtMuIonisation.cxx

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// $Id: ExtMuIonisation.cxx,v 1.9 2022/01/26 03:16:33 wangll Exp $
// GEANT4 tag $Name: TrkExtAlg-00-00-67 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     ExtMuIonisation
//
// Author:        Laszlo Urban
// 
// Creation date: 30.09.1997
//
// Modifications:
//
// 08-04-98 remove 'tracking cut' of the ionizing particle (mma)
// 26-10-98 new stuff from R.Kokoulin + cleanup , L.Urban
// 10-02-00 modifications , new e.m. structure, L.Urban
// 23-03-01 R.Kokoulin's correction is commented out, L.Urban
// 29-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation
// 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
// 28-08-01 new function ComputeRestrictedMeandEdx() + 'cleanup' (mma)
// 17-09-01 migration of Materials to pure STL (mma)
// 26-09-01 completion of RetrievePhysicsTable (mma)
// 29-10-01 all static functions no more inlined (mma)
// 07-11-01 correction(Tmax+xsection computation) L.Urban
// 08-11-01 particleMass becomes a local variable (mma)
// 10-05-02 V.Ivanchenko update to new design
// 04-12-02 V.Ivanchenko the low energy limit for Kokoulin model to 10 GeV
// 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 Add SetIntegral method to choose fluctuation model (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)
// 10-02-04 Calculation of radiative corrections using R.Kokoulin model (V.Ivanchenko)
// 27-05-04 Set integral to be a default regime (V.Ivanchenko) 
// 17-08-04 Utilise mu+ tables for mu- (V.Ivanchenko)
// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
// -----------------------------------------------------------------------------------
// 15-04-05 Omit the correction of momentum direction due to production of secenderies.
//          This is needed for my Track Extrapotation. (L.L.Wang)
// -------------------------------------------------------------------
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
//
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#include "TrkExtAlg/ExtMuIonisation.h"
 
#include "G4Electron.hh"
#include "G4MuonPlus.hh"
#include "G4MuonMinus.hh"
#include "G4BraggModel.hh"
#include "G4BetheBlochModel.hh"
#include "G4MuBetheBlochModel.hh"
#include "G4UniversalFluctuation.hh"
#include "G4BohrFluctuations.hh"
#include "G4UnitsTable.hh"
#include "G4PhysicalConstants.hh"
 
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using namespace std;
 
ExtMuIonisation::ExtMuIonisation(const G4String& name)
  : G4VEnergyLossProcess(name),
    theParticle(0),
    theBaseParticle(0),
    isInitialised(false)
{
  SetDEDXBinning(120);
  //SetLambdaBinning(120);
  SetMinKinEnergy(0.1*keV);
  SetMaxKinEnergy(100.0*TeV);
  SetLossFluctuations(false);
}
 
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ExtMuIonisation::~ExtMuIonisation()
{}
 
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void ExtMuIonisation::InitialiseEnergyLossProcess(const G4ParticleDefinition* part,
                                          const G4ParticleDefinition* bpart)
{
    if(!isInitialised) 
    {
        theParticle = part;
        theBaseParticle = bpart;
 
        mass = theParticle->GetPDGMass();
        SetSecondaryParticle(G4Electron::Electron());
 
        flucModel = new G4UniversalFluctuation();
        
        G4VEmModel* em = new G4BraggModel();
        em->SetLowEnergyLimit(0.1*keV);
        em->SetHighEnergyLimit(0.2*MeV);
        AddEmModel(1, em, flucModel);
        G4VEmModel* em1 = new G4BetheBlochModel();
        em1->SetLowEnergyLimit(0.2*MeV);
        em1->SetHighEnergyLimit(1.0*GeV);
        AddEmModel(2, em1, flucModel);
        G4VEmModel* em2 = new G4MuBetheBlochModel();
        em2->SetLowEnergyLimit(1.0*GeV);
        em2->SetHighEnergyLimit(100.0*TeV);
        AddEmModel(3, em2, flucModel);
        SetStepFunction(0.2, 1.0*mm);
        ratio = electron_mass_c2/mass;
        isInitialised = true;
    }
}
 
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void ExtMuIonisation::PrintInfo()
{
  G4cout << "      Bether-Bloch model for E > 0.2 MeV, "
         << "parametrisation of Bragg peak below, "
         << G4endl;
  G4cout << "      radiative corrections for E > 1 GeV" << G4endl;
}
 
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