Gabriele Cosmo
500 lines
18 KiB
C++
500 lines
18 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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// $Id: G4AdjointhIonisationModel.cc 66892 2013-01-17 10:57:59Z gunter $
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//
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#include "G4AdjointhIonisationModel.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4AdjointCSManager.hh"
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#include "G4Integrator.hh"
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#include "G4TrackStatus.hh"
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#include "G4ParticleChange.hh"
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#include "G4AdjointElectron.hh"
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#include "G4AdjointProton.hh"
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#include "G4AdjointInterpolator.hh"
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#include "G4BetheBlochModel.hh"
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#include "G4BraggModel.hh"
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#include "G4Proton.hh"
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#include "G4NistManager.hh"
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////////////////////////////////////////////////////////////////////////////////
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//
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G4AdjointhIonisationModel::G4AdjointhIonisationModel(G4ParticleDefinition* projectileDefinition):
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G4VEmAdjointModel("Adjoint_hIonisation")
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{
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UseMatrix =true;
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UseMatrixPerElement = true;
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ApplyCutInRange = true;
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UseOnlyOneMatrixForAllElements = true;
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CS_biasing_factor =1.;
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second_part_of_same_type =false;
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//The direct EM Modfel is taken has BetheBloch it is only used for the computation
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// of the differential cross section.
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//The Bragg model could be used as an alternative as it offers the same differential cross section
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theDirectEMModel = new G4BetheBlochModel(projectileDefinition);
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theBraggDirectEMModel = new G4BraggModel(projectileDefinition);
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theAdjEquivOfDirectSecondPartDef=G4AdjointElectron::AdjointElectron();
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theDirectPrimaryPartDef = projectileDefinition;
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theAdjEquivOfDirectPrimPartDef = 0;
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if (projectileDefinition == G4Proton::Proton()) {
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theAdjEquivOfDirectPrimPartDef = G4AdjointProton::AdjointProton();
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}
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DefineProjectileProperty();
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4AdjointhIonisationModel::~G4AdjointhIonisationModel()
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{;}
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////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointhIonisationModel::SampleSecondaries(const G4Track& aTrack,
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G4bool IsScatProjToProjCase,
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G4ParticleChange* fParticleChange)
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{
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if (!UseMatrix) return RapidSampleSecondaries(aTrack,IsScatProjToProjCase,fParticleChange);
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const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle();
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//Elastic inverse scattering
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//---------------------------------------------------------
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G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy();
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G4double adjointPrimP =theAdjointPrimary->GetTotalMomentum();
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if (adjointPrimKinEnergy>HighEnergyLimit*0.999){
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return;
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}
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//Sample secondary energy
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//-----------------------
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G4double projectileKinEnergy = SampleAdjSecEnergyFromCSMatrix(adjointPrimKinEnergy, IsScatProjToProjCase);
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CorrectPostStepWeight(fParticleChange,
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aTrack.GetWeight(),
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adjointPrimKinEnergy,
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projectileKinEnergy,
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IsScatProjToProjCase); //Caution !!!this weight correction should be always applied
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//Kinematic:
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//we consider a two body elastic scattering for the forward processes where the projectile knock on an e- at rest and gives
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// him part of its energy
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//----------------------------------------------------------------------------------------
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G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
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G4double projectileTotalEnergy = projectileM0+projectileKinEnergy;
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G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0;
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//Companion
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//-----------
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G4double companionM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
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if (IsScatProjToProjCase) {
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companionM0=theAdjEquivOfDirectSecondPartDef->GetPDGMass();
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}
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G4double companionTotalEnergy =companionM0+ projectileKinEnergy-adjointPrimKinEnergy;
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G4double companionP2 = companionTotalEnergy*companionTotalEnergy - companionM0*companionM0;
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//Projectile momentum
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//--------------------
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G4double P_parallel = (adjointPrimP*adjointPrimP + projectileP2 - companionP2)/(2.*adjointPrimP);
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G4double P_perp = std::sqrt( projectileP2 - P_parallel*P_parallel);
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G4ThreeVector dir_parallel=theAdjointPrimary->GetMomentumDirection();
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G4double phi =G4UniformRand()*2.*3.1415926;
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G4ThreeVector projectileMomentum = G4ThreeVector(P_perp*std::cos(phi),P_perp*std::sin(phi),P_parallel);
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projectileMomentum.rotateUz(dir_parallel);
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if (!IsScatProjToProjCase ){ //kill the primary and add a secondary
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fParticleChange->ProposeTrackStatus(fStopAndKill);
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fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum));
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//G4cout<<"projectileMomentum "<<projectileMomentum<<G4endl;
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}
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else {
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fParticleChange->ProposeEnergy(projectileKinEnergy);
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fParticleChange->ProposeMomentumDirection(projectileMomentum.unit());
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointhIonisationModel::RapidSampleSecondaries(const G4Track& aTrack,
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G4bool IsScatProjToProjCase,
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G4ParticleChange* fParticleChange)
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{
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const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle();
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DefineCurrentMaterial(aTrack.GetMaterialCutsCouple());
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G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy();
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G4double adjointPrimP =theAdjointPrimary->GetTotalMomentum();
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if (adjointPrimKinEnergy>HighEnergyLimit*0.999){
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return;
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}
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G4double projectileKinEnergy =0.;
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G4double eEnergy=0.;
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G4double newCS=currentMaterial->GetElectronDensity()*twopi_mc2_rcl2*mass;
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if (!IsScatProjToProjCase){//1/E^2 distribution
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eEnergy=adjointPrimKinEnergy;
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G4double Emax = GetSecondAdjEnergyMaxForProdToProjCase(adjointPrimKinEnergy);
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G4double Emin= GetSecondAdjEnergyMinForProdToProjCase(adjointPrimKinEnergy);
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if (Emin>=Emax) return;
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G4double a=1./Emax;
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G4double b=1./Emin;
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newCS=newCS*(b-a)/eEnergy;
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projectileKinEnergy =1./(b- (b-a)*G4UniformRand());
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}
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else { G4double Emax = GetSecondAdjEnergyMaxForScatProjToProjCase(adjointPrimKinEnergy);
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G4double Emin = GetSecondAdjEnergyMinForScatProjToProjCase(adjointPrimKinEnergy,currentTcutForDirectSecond);
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if (Emin>=Emax) return;
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G4double diff1=Emin-adjointPrimKinEnergy;
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G4double diff2=Emax-adjointPrimKinEnergy;
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G4double t1=adjointPrimKinEnergy*(1./diff1-1./diff2);
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G4double t2=adjointPrimKinEnergy*(1./Emin-1./Emax);
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/*G4double f31=diff1/Emin;
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G4double f32=diff2/Emax/f31;*/
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G4double t3=2.*std::log(Emax/Emin);
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G4double sum_t=t1+t2+t3;
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newCS=newCS*sum_t/adjointPrimKinEnergy/adjointPrimKinEnergy;
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G4double t=G4UniformRand()*sum_t;
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if (t <=t1 ){
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G4double q= G4UniformRand()*t1/adjointPrimKinEnergy ;
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projectileKinEnergy =adjointPrimKinEnergy +1./(1./diff1-q);
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}
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else if (t <=t2 ) {
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G4double q= G4UniformRand()*t2/adjointPrimKinEnergy;
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projectileKinEnergy =1./(1./Emin-q);
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}
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else {
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projectileKinEnergy=Emin*std::pow(Emax/Emin,G4UniformRand());
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}
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eEnergy=projectileKinEnergy-adjointPrimKinEnergy;
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}
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G4double diffCS_perAtom_Used=twopi_mc2_rcl2*mass*adjointPrimKinEnergy/projectileKinEnergy/projectileKinEnergy/eEnergy/eEnergy;
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//Weight correction
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//-----------------------
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//First w_corr is set to the ratio between adjoint total CS and fwd total CS
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G4double w_corr=G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection();
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//G4cout<<w_corr<<G4endl;
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w_corr*=newCS/lastCS;
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//G4cout<<w_corr<<G4endl;
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//Then another correction is needed due to the fact that a biaised differential CS has been used rather than the one consistent with the direct model
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//Here we consider the true diffCS as the one obtained by the numerical differentiation over Tcut of the direct CS
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G4double diffCS = DiffCrossSectionPerAtomPrimToSecond(projectileKinEnergy, eEnergy,1,1);
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w_corr*=diffCS/diffCS_perAtom_Used;
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//G4cout<<w_corr<<G4endl;
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G4double new_weight = aTrack.GetWeight()*w_corr;
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fParticleChange->SetParentWeightByProcess(false);
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fParticleChange->SetSecondaryWeightByProcess(false);
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fParticleChange->ProposeParentWeight(new_weight);
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//Kinematic:
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//we consider a two body elastic scattering for the forward processes where the projectile knock on an e- at rest and gives
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// him part of its energy
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//----------------------------------------------------------------------------------------
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G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
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G4double projectileTotalEnergy = projectileM0+projectileKinEnergy;
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G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0;
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//Companion
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//-----------
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G4double companionM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
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if (IsScatProjToProjCase) {
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companionM0=theAdjEquivOfDirectSecondPartDef->GetPDGMass();
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}
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G4double companionTotalEnergy =companionM0+ projectileKinEnergy-adjointPrimKinEnergy;
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G4double companionP2 = companionTotalEnergy*companionTotalEnergy - companionM0*companionM0;
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//Projectile momentum
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//--------------------
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G4double P_parallel = (adjointPrimP*adjointPrimP + projectileP2 - companionP2)/(2.*adjointPrimP);
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G4double P_perp = std::sqrt( projectileP2 - P_parallel*P_parallel);
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G4ThreeVector dir_parallel=theAdjointPrimary->GetMomentumDirection();
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G4double phi =G4UniformRand()*2.*3.1415926;
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G4ThreeVector projectileMomentum = G4ThreeVector(P_perp*std::cos(phi),P_perp*std::sin(phi),P_parallel);
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projectileMomentum.rotateUz(dir_parallel);
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if (!IsScatProjToProjCase ){ //kill the primary and add a secondary
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fParticleChange->ProposeTrackStatus(fStopAndKill);
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fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum));
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//G4cout<<"projectileMomentum "<<projectileMomentum<<G4endl;
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}
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else {
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fParticleChange->ProposeEnergy(projectileKinEnergy);
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fParticleChange->ProposeMomentumDirection(projectileMomentum.unit());
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4AdjointhIonisationModel::DiffCrossSectionPerAtomPrimToSecond(
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G4double kinEnergyProj,
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G4double kinEnergyProd,
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G4double Z,
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G4double A)
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{//Probably that here the Bragg Model should be also used for kinEnergyProj/nuc<2MeV
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G4double dSigmadEprod=0;
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G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(kinEnergyProd);
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G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(kinEnergyProd);
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if (kinEnergyProj>Emin_proj && kinEnergyProj<=Emax_proj){ //the produced particle should have a kinetic energy smaller than the projectile
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G4double Tmax=kinEnergyProj;
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G4double E1=kinEnergyProd;
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G4double E2=kinEnergyProd*1.000001;
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G4double dE=(E2-E1);
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G4double sigma1,sigma2;
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if (kinEnergyProj >2.*MeV){
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sigma1=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E1,1.e20);
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sigma2=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E2,1.e20);
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}
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else {
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sigma1=theBraggDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E1,1.e20);
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sigma2=theBraggDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E2,1.e20);
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}
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dSigmadEprod=(sigma1-sigma2)/dE;
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if (dSigmadEprod>1.) {
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G4cout<<"sigma1 "<<kinEnergyProj/MeV<<'\t'<<kinEnergyProd/MeV<<'\t'<<sigma1<<G4endl;
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G4cout<<"sigma2 "<<kinEnergyProj/MeV<<'\t'<<kinEnergyProd/MeV<<'\t'<<sigma2<<G4endl;
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G4cout<<"dsigma "<<kinEnergyProj/MeV<<'\t'<<kinEnergyProd/MeV<<'\t'<<dSigmadEprod<<G4endl;
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}
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//correction of differential cross section at high energy to correct for the suppression of particle at secondary at high
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//energy used in the Bethe Bloch Model. This correction consist to multiply by g the probability function used
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//to test the rejection of a secondary
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//-------------------------
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//Source code taken from G4BetheBlochModel::SampleSecondaries
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G4double deltaKinEnergy = kinEnergyProd;
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//Part of the taken code
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//----------------------
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// projectile formfactor - suppresion of high energy
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// delta-electron production at high energy
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G4double x = formfact*deltaKinEnergy;
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if(x > 1.e-6) {
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G4double totEnergy = kinEnergyProj + mass;
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G4double etot2 = totEnergy*totEnergy;
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G4double beta2 = kinEnergyProj*(kinEnergyProj + 2.0*mass)/etot2;
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G4double f;
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G4double f1 = 0.0;
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f = 1.0 - beta2*deltaKinEnergy/Tmax;
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if( 0.5 == spin ) {
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f1 = 0.5*deltaKinEnergy*deltaKinEnergy/etot2;
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f += f1;
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}
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G4double x1 = 1.0 + x;
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G4double gg = 1.0/(x1*x1);
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if( 0.5 == spin ) {
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G4double x2 = 0.5*electron_mass_c2*deltaKinEnergy/(mass*mass);
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gg *= (1.0 + magMoment2*(x2 - f1/f)/(1.0 + x2));
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}
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if(gg > 1.0) {
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G4cout << "### G4BetheBlochModel in Adjoint Sim WARNING: g= " << g
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<< G4endl;
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gg=1.;
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}
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//G4cout<<"gg"<<gg<<G4endl;
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dSigmadEprod*=gg;
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}
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}
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return dSigmadEprod;
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointhIonisationModel::DefineProjectileProperty()
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{
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//Slightly modified code taken from G4BetheBlochModel::SetParticle
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//------------------------------------------------
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G4String pname = theDirectPrimaryPartDef->GetParticleName();
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if (theDirectPrimaryPartDef->GetParticleType() == "nucleus" &&
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pname != "deuteron" && pname != "triton") {
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isIon = true;
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}
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mass = theDirectPrimaryPartDef->GetPDGMass();
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mass_ratio_projectile = proton_mass_c2/theDirectPrimaryPartDef->GetPDGMass();;
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spin = theDirectPrimaryPartDef->GetPDGSpin();
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G4double q = theDirectPrimaryPartDef->GetPDGCharge()/eplus;
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chargeSquare = q*q;
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ratio = electron_mass_c2/mass;
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ratio2 = ratio*ratio;
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one_plus_ratio_2=(1+ratio)*(1+ratio);
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one_minus_ratio_2=(1-ratio)*(1-ratio);
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G4double magmom = theDirectPrimaryPartDef->GetPDGMagneticMoment()
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*mass/(0.5*eplus*hbar_Planck*c_squared);
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magMoment2 = magmom*magmom - 1.0;
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formfact = 0.0;
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if(theDirectPrimaryPartDef->GetLeptonNumber() == 0) {
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G4double x = 0.8426*GeV;
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if(spin == 0.0 && mass < GeV) {x = 0.736*GeV;}
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else if(mass > GeV) {
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x /= G4NistManager::Instance()->GetZ13(mass/proton_mass_c2);
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// tlimit = 51.2*GeV*A13[iz]*A13[iz];
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}
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formfact = 2.0*electron_mass_c2/(x*x);
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tlimit = 2.0/formfact;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4AdjointhIonisationModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
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G4double primEnergy,
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G4bool IsScatProjToProjCase)
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{
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if (UseMatrix) return G4VEmAdjointModel::AdjointCrossSection(aCouple,primEnergy,IsScatProjToProjCase);
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DefineCurrentMaterial(aCouple);
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G4double Cross=currentMaterial->GetElectronDensity()*twopi_mc2_rcl2*mass;
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if (!IsScatProjToProjCase ){
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G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(primEnergy);
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G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(primEnergy);
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if (Emax_proj>Emin_proj && primEnergy > currentTcutForDirectSecond) {
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Cross*=(1./Emin_proj -1./Emax_proj)/primEnergy;
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}
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else Cross=0.;
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}
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else {
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G4double Emax_proj = GetSecondAdjEnergyMaxForScatProjToProjCase(primEnergy);
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G4double Emin_proj = GetSecondAdjEnergyMinForScatProjToProjCase(primEnergy,currentTcutForDirectSecond);
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G4double diff1=Emin_proj-primEnergy;
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G4double diff2=Emax_proj-primEnergy;
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G4double t1=(1./diff1+1./Emin_proj-1./diff2-1./Emax_proj)/primEnergy;
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//G4double t2=2.*std::log(diff2*Emin_proj/Emax_proj/diff1)/primEnergy/primEnergy;
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G4double t2=2.*std::log(Emax_proj/Emin_proj)/primEnergy/primEnergy;
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Cross*=(t1+t2);
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|
|
|
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}
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lastCS =Cross;
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return Cross;
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}
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//////////////////////////////////////////////////////////////////////////////
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|
//
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G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMaxForScatProjToProjCase(G4double PrimAdjEnergy)
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|
{
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|
G4double Tmax=PrimAdjEnergy*one_plus_ratio_2/(one_minus_ratio_2-2.*ratio*PrimAdjEnergy/mass);
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|
return Tmax;
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|
}
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|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMinForScatProjToProjCase(G4double PrimAdjEnergy,G4double Tcut)
|
|
{ return PrimAdjEnergy+Tcut;
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|
}
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|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMaxForProdToProjCase(G4double )
|
|
{ return HighEnergyLimit;
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|
}
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|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMinForProdToProjCase(G4double PrimAdjEnergy)
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|
{ G4double Tmin= (2*PrimAdjEnergy-4*mass + std::sqrt(4.*PrimAdjEnergy*PrimAdjEnergy +16.*mass*mass + 8.*PrimAdjEnergy*mass*(1/ratio +ratio)))/4.;
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|
return Tmin;
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|
}
|