Gabriele Cosmo
189 lines
7.4 KiB
C++
189 lines
7.4 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4MuIonisation
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//
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// Author: Laszlo Urban
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//
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// Creation date: 30.09.1997
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//
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// Modifications:
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//
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// 08-04-98 remove 'tracking cut' of the ionizing particle (mma)
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// 26-10-98 new stuff from R.Kokoulin + cleanup , L.Urban
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// 10-02-00 modifications , new e.m. structure, L.Urban
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// 23-03-01 R.Kokoulin's correction is commented out, L.Urban
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// 29-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation
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// 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
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// 28-08-01 new function ComputeRestrictedMeandEdx() + 'cleanup' (mma)
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// 17-09-01 migration of Materials to pure STL (mma)
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// 26-09-01 completion of RetrievePhysicsTable (mma)
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// 29-10-01 all static functions no more inlined (mma)
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// 07-11-01 correction(Tmax+xsection computation) L.Urban
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// 08-11-01 particleMass becomes a local variable (mma)
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// 10-05-02 V.Ivanchenko update to new design
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// 04-12-02 V.Ivanchenko the low energy limit for Kokoulin model to 10 GeV
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// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
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// 26-12-02 Secondary production moved to derived classes (V.Ivanchenko)
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// 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
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// 23-05-03 Define default integral + BohrFluctuations (V.Ivanchenko)
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// 03-06-03 Add SetIntegral method to choose fluctuation model (V.Ivanchenko)
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// 03-06-03 Fix initialisation problem for STD ionisation (V.Ivanchenko)
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// 04-08-03 Set integral=false to be default (V.Ivanchenko)
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// 08-08-03 STD substitute standard (V.Ivanchenko)
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// 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
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// 10-02-04 Calculation of radiative corrections using R.Kokoulin model (V.I.)
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// 27-05-04 Set integral to be a default regime (V.Ivanchenko)
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// 17-08-04 Utilise mu+ tables for mu- (V.Ivanchenko)
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// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
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// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
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// 12-08-05 SetStepLimits(0.2, 0.1*mm) (mma)
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// 02-09-05 SetStepLimits(0.2, 1*mm) (V.Ivantchenko)
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// 12-08-05 SetStepLimits(0.2, 0.1*mm) + integral off (V.Ivantchenko)
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// 10-01-06 SetStepLimits -> SetStepFunction (V.Ivantchenko)
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4MuIonisation.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4Electron.hh"
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#include "G4MuonPlus.hh"
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#include "G4MuonMinus.hh"
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#include "G4BraggModel.hh"
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#include "G4BetheBlochModel.hh"
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#include "G4MuBetheBlochModel.hh"
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#include "G4UniversalFluctuation.hh"
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#include "G4IonFluctuations.hh"
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#include "G4BohrFluctuations.hh"
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#include "G4UnitsTable.hh"
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#include "G4ICRU73QOModel.hh"
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#include "G4EmParameters.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4MuIonisation::G4MuIonisation(const G4String& name)
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: G4VEnergyLossProcess(name),
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theParticle(nullptr),
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theBaseParticle(nullptr),
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isInitialised(false)
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{
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mass = ratio = 0;
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SetProcessSubType(fIonisation);
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SetSecondaryParticle(G4Electron::Electron());
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4MuIonisation::IsApplicable(const G4ParticleDefinition& p)
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{
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return (p.GetPDGCharge() != 0.0 && p.GetPDGMass() > 10.0*MeV);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4MuIonisation::MinPrimaryEnergy(const G4ParticleDefinition*,
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const G4Material*,
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G4double cut)
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{
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G4double x = 0.5*cut/electron_mass_c2;
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G4double gam = x*ratio + std::sqrt((1. + x)*(1. + x*ratio*ratio));
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return mass*(gam - 1.0);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4MuIonisation::InitialiseEnergyLossProcess(const G4ParticleDefinition* part,
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const G4ParticleDefinition* bpart)
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{
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if(!isInitialised) {
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theParticle = part;
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theBaseParticle = bpart;
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mass = theParticle->GetPDGMass();
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G4double q = theParticle->GetPDGCharge();
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G4EmParameters* param = G4EmParameters::Instance();
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G4double elow = 0.2*MeV;
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G4double emax = param->MaxKinEnergy();
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G4double ehigh = std::min(1*GeV, emax);
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// Bragg peak model
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if (!EmModel(0)) {
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if(q > 0.0) { SetEmModel(new G4BraggModel()); }
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else { SetEmModel(new G4ICRU73QOModel()); }
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}
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EmModel(0)->SetLowEnergyLimit(param->MinKinEnergy());
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EmModel(0)->SetHighEnergyLimit(elow);
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AddEmModel(1, EmModel(0), new G4IonFluctuations());
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// high energy fluctuation model
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if (!FluctModel()) { SetFluctModel(new G4UniversalFluctuation()); }
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// moderate energy model
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if (!EmModel(1)) { SetEmModel(new G4BetheBlochModel()); }
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EmModel(1)->SetLowEnergyLimit(elow);
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EmModel(1)->SetHighEnergyLimit(ehigh);
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AddEmModel(2, EmModel(1), FluctModel());
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// high energy model
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if(ehigh < emax) {
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if (!EmModel(2)) { SetEmModel(new G4MuBetheBlochModel()); }
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EmModel(2)->SetLowEnergyLimit(ehigh);
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EmModel(2)->SetHighEnergyLimit(emax);
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AddEmModel(3, EmModel(2), FluctModel());
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}
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ratio = electron_mass_c2/mass;
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isInitialised = true;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4MuIonisation::PrintInfo()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4MuIonisation::ProcessDescription(std::ostream& out) const
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{
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out << " Muon ionisation";
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G4VEnergyLossProcess::ProcessDescription(out);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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