Gabriele Cosmo
365 lines
15 KiB
C++
365 lines
15 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: G4AdjointIonIonisationModel.cc 66892 2013-01-17 10:57:59Z gunter $
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//
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#include "G4AdjointIonIonisationModel.hh"
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#include "G4AdjointCSManager.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.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 "G4BraggIonModel.hh"
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#include "G4Proton.hh"
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#include "G4GenericIon.hh"
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#include "G4NistManager.hh"
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////////////////////////////////////////////////////////////////////////////////
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//
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G4AdjointIonIonisationModel::G4AdjointIonIonisationModel():
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G4VEmAdjointModel("Adjoint_IonIonisation")
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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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use_only_bragg = false; // for the Ion ionisation using the parametrised table model the cross sections and the sample of secondaries is done
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// as in the BraggIonModel, Therefore the use of this flag;
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//The direct EM Model 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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theBetheBlochDirectEMModel = new G4BetheBlochModel(G4GenericIon::GenericIon());
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theBraggIonDirectEMModel = new G4BraggIonModel(G4GenericIon::GenericIon());
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theAdjEquivOfDirectSecondPartDef=G4AdjointElectron::AdjointElectron();
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theDirectPrimaryPartDef =0;
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theAdjEquivOfDirectPrimPartDef =0;
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/* theDirectPrimaryPartDef =fwd_ion;
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theAdjEquivOfDirectPrimPartDef =adj_ion;
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DefineProjectileProperty();*/
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4AdjointIonIonisationModel::~G4AdjointIonIonisationModel()
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{;}
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////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointIonIonisationModel::SampleSecondaries(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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//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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G4double G4AdjointIonIonisationModel::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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G4double kinEnergyProjScaled = massRatio*kinEnergyProj;
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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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theDirectEMModel =theBraggIonDirectEMModel;
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if (kinEnergyProjScaled >2.*MeV && !use_only_bragg) theDirectEMModel = theBetheBlochDirectEMModel; //Bethe Bloch Model
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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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dSigmadEprod=(sigma1-sigma2)/dE;
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//G4double chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPrimaryPartDef,currentMaterial,E);
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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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if (theDirectEMModel == theBetheBlochDirectEMModel ){
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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: gg= " << gg
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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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}
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return dSigmadEprod;
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointIonIonisationModel::SetIon(G4ParticleDefinition* adj_ion, G4ParticleDefinition* fwd_ion)
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{ theDirectPrimaryPartDef =fwd_ion;
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theAdjEquivOfDirectPrimPartDef =adj_ion;
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DefineProjectileProperty();
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointIonIonisationModel::CorrectPostStepWeight(G4ParticleChange* fParticleChange, G4double old_weight,
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G4double adjointPrimKinEnergy, G4double projectileKinEnergy,G4bool )
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{
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//It is needed because the direct cross section used to compute the differential cross section is not the one used in
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// the direct model where the GenericIon stuff is considered with correction of effective charge. In the direct model the samnepl of secondaries does
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// not reflect the integral cross section. The integral fwd cross section that we used to compute the differential CS
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// match the sample of secondaries in the forward case despite the fact that its is not the same total CS than in the FWD case. For this reasion an extra
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// weight correction is needed at the end.
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G4double new_weight=old_weight;
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//the correction of CS due to the problem explained above
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G4double kinEnergyProjScaled = massRatio*projectileKinEnergy;
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theDirectEMModel =theBraggIonDirectEMModel;
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if (kinEnergyProjScaled >2.*MeV && !use_only_bragg) theDirectEMModel = theBetheBlochDirectEMModel; //Bethe Bloch Model
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G4double UsedFwdCS=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,projectileKinEnergy,1,1 ,currentTcutForDirectSecond,1.e20);
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G4double chargeSqRatio =1.;
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if (chargeSquare>1.) chargeSqRatio = theDirectEMModel->GetChargeSquareRatio(theDirectPrimaryPartDef,currentMaterial,projectileKinEnergy);
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G4double CorrectFwdCS = chargeSqRatio*theDirectEMModel->ComputeCrossSectionPerAtom(G4GenericIon::GenericIon(),kinEnergyProjScaled,1,1 ,currentTcutForDirectSecond,1.e20);
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if (UsedFwdCS >0) new_weight*= CorrectFwdCS/UsedFwdCS;//May be some check is needed if UsedFwdCS ==0 probably that then we should avoid a secondary to be produced,
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//additional CS crorrection needed for cross section biasing in general.
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//May be wrong for ions!!! Most of the time not used!
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G4double w_corr =1./CS_biasing_factor;
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w_corr*=G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection();
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new_weight*=w_corr;
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new_weight*=projectileKinEnergy/adjointPrimKinEnergy;
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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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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointIonIonisationModel::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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massRatio= G4GenericIon::GenericIon()->GetPDGMass()/mass;
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mass_ratio_projectile = massRatio;
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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 G4AdjointIonIonisationModel::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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//////////////////////////////////////////////////////////////////////////////
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//
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G4double G4AdjointIonIonisationModel::GetSecondAdjEnergyMinForScatProjToProjCase(G4double PrimAdjEnergy,G4double Tcut)
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{ return PrimAdjEnergy+Tcut;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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G4double G4AdjointIonIonisationModel::GetSecondAdjEnergyMaxForProdToProjCase(G4double )
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{ return HighEnergyLimit;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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G4double G4AdjointIonIonisationModel::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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}
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