Gabriele Cosmo
274 lines
10 KiB
C++
274 lines
10 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: G4AdjointPhotoElectricModel.cc 91870 2015-08-07 15:21:40Z gcosmo $
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//
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#include "G4AdjointPhotoElectricModel.hh"
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#include "G4AdjointCSManager.hh"
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#include "G4PhysicalConstants.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 "G4Gamma.hh"
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#include "G4AdjointGamma.hh"
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////////////////////////////////////////////////////////////////////////////////
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//
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G4AdjointPhotoElectricModel::G4AdjointPhotoElectricModel():
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G4VEmAdjointModel("AdjointPEEffect")
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{ SetUseMatrix(false);
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SetApplyCutInRange(false);
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//Initialization
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current_eEnergy =0.;
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totAdjointCS=0.;
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factorCSBiasing =1.;
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post_step_AdjointCS =0.;
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pre_step_AdjointCS =0.;
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totBiasedAdjointCS =0.;
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index_element=0;
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theAdjEquivOfDirectPrimPartDef =G4AdjointGamma::AdjointGamma();
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theAdjEquivOfDirectSecondPartDef=G4AdjointElectron::AdjointElectron();
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theDirectPrimaryPartDef=G4Gamma::Gamma();
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second_part_of_same_type=false;
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theDirectPEEffectModel = new G4PEEffectFluoModel();
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4AdjointPhotoElectricModel::~G4AdjointPhotoElectricModel()
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{;}
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////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointPhotoElectricModel::SampleSecondaries(const G4Track& aTrack,
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G4bool IsScatProjToProjCase,
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G4ParticleChange* fParticleChange)
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{ if (IsScatProjToProjCase) return ;
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//Compute the totAdjointCS vectors if not already done for the current couple and electron energy
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//-----------------------------------------------------------------------------------------------
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const G4MaterialCutsCouple* aCouple = aTrack.GetMaterialCutsCouple();
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const G4DynamicParticle* aDynPart = aTrack.GetDynamicParticle() ;
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G4double electronEnergy = aDynPart->GetKineticEnergy();
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G4ThreeVector electronDirection= aDynPart->GetMomentumDirection() ;
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pre_step_AdjointCS = totAdjointCS; //The last computed CS was at pre step point
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post_step_AdjointCS = AdjointCrossSection(aCouple, electronEnergy,IsScatProjToProjCase);
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post_step_AdjointCS = totAdjointCS;
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//Sample element
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//-------------
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const G4ElementVector* theElementVector = currentMaterial->GetElementVector();
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size_t nelm = currentMaterial->GetNumberOfElements();
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G4double rand_CS= G4UniformRand()*xsec[nelm-1];
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for (index_element=0; index_element<nelm-1; index_element++){
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if (rand_CS<xsec[index_element]) break;
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}
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//Sample shell and binding energy
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//-------------
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G4int nShells = (*theElementVector)[index_element]->GetNbOfAtomicShells();
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rand_CS= shell_prob[index_element][nShells-1]*G4UniformRand();
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G4int i = 0;
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for (i=0; i<nShells-1; i++){
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if (rand_CS<shell_prob[index_element][i]) break;
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}
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G4double gammaEnergy= electronEnergy+(*theElementVector)[index_element]->GetAtomicShell(i);
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//Sample cos theta
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//Copy of the G4PEEfectFluoModel cos theta sampling method ElecCosThetaDistribution.
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//This method cannot be used directly from G4PEEfectFluoModel because it is a friend method. I should ask Vladimir to change that
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//------------------------------------------------------------------------------------------------
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//G4double cos_theta = theDirectPEEffectModel->ElecCosThetaDistribution(electronEnergy);
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G4double cos_theta = 1.;
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G4double gamma = 1. + electronEnergy/electron_mass_c2;
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if (gamma <= 5.) {
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G4double beta = std::sqrt(gamma*gamma-1.)/gamma;
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G4double b = 0.5*gamma*(gamma-1.)*(gamma-2);
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G4double rndm,term,greject,grejsup;
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if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b);
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else grejsup = gamma*gamma*(1.+b+beta*b);
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do { rndm = 1.-2*G4UniformRand();
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cos_theta = (rndm+beta)/(rndm*beta+1.);
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term = 1.-beta*cos_theta;
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greject = (1.-cos_theta*cos_theta)*(1.+b*term)/(term*term);
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// Loop checking, 07-Aug-2015, Vladimir Ivanchenko
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} while(greject < G4UniformRand()*grejsup);
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}
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// direction of the adjoint gamma electron
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//---------------------------------------
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G4double sin_theta = std::sqrt(1.-cos_theta*cos_theta);
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G4double Phi = twopi * G4UniformRand();
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G4double dirx = sin_theta*std::cos(Phi),diry = sin_theta*std::sin(Phi),dirz = cos_theta;
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G4ThreeVector adjoint_gammaDirection(dirx,diry,dirz);
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adjoint_gammaDirection.rotateUz(electronDirection);
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//Weight correction
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//-----------------------
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CorrectPostStepWeight(fParticleChange, aTrack.GetWeight(), electronEnergy,gammaEnergy,IsScatProjToProjCase);
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//Create secondary and modify fParticleChange
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//--------------------------------------------
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G4DynamicParticle* anAdjointGamma = new G4DynamicParticle (
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G4AdjointGamma::AdjointGamma(),adjoint_gammaDirection, gammaEnergy);
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fParticleChange->ProposeTrackStatus(fStopAndKill);
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fParticleChange->AddSecondary(anAdjointGamma);
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointPhotoElectricModel::CorrectPostStepWeight(G4ParticleChange* fParticleChange,
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G4double old_weight,
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G4double adjointPrimKinEnergy,
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G4double projectileKinEnergy ,
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G4bool )
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{
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G4double new_weight=old_weight;
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G4double w_corr =G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection()/factorCSBiasing;
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w_corr*=post_step_AdjointCS/pre_step_AdjointCS;
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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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G4double G4AdjointPhotoElectricModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
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G4double electronEnergy,
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G4bool IsScatProjToProjCase)
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{
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if (IsScatProjToProjCase) return 0.;
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if (aCouple !=currentCouple || current_eEnergy !=electronEnergy) {
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totAdjointCS = 0.;
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DefineCurrentMaterialAndElectronEnergy(aCouple, electronEnergy);
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const G4ElementVector* theElementVector = currentMaterial->GetElementVector();
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const double* theAtomNumDensityVector = currentMaterial->GetVecNbOfAtomsPerVolume();
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size_t nelm = currentMaterial->GetNumberOfElements();
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for (index_element=0;index_element<nelm;index_element++){
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totAdjointCS +=AdjointCrossSectionPerAtom((*theElementVector)[index_element],electronEnergy)*theAtomNumDensityVector[index_element];
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xsec[index_element] = totAdjointCS;
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}
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totBiasedAdjointCS=std::min(totAdjointCS,0.01);
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// totBiasedAdjointCS=totAdjointCS;
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factorCSBiasing = totBiasedAdjointCS/totAdjointCS;
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lastCS=totBiasedAdjointCS;
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}
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return totBiasedAdjointCS;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4AdjointPhotoElectricModel::GetAdjointCrossSection(const G4MaterialCutsCouple* aCouple,
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G4double electronEnergy,
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G4bool IsScatProjToProjCase)
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{ return AdjointCrossSection(aCouple,electronEnergy,IsScatProjToProjCase);
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4AdjointPhotoElectricModel::AdjointCrossSectionPerAtom(const G4Element* anElement,G4double electronEnergy)
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{
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G4int nShells = anElement->GetNbOfAtomicShells();
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G4double Z= anElement->GetZ();
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G4int i = 0;
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G4double B0=anElement->GetAtomicShell(0);
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G4double gammaEnergy = electronEnergy+B0;
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G4double CS= theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,0.,0.,0.);
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G4double adjointCS =0.;
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if (CS >0) adjointCS += CS/gammaEnergy;
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shell_prob[index_element][0] = adjointCS;
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for (i=1;i<nShells;i++){
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//G4cout<<i<<G4endl;
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G4double Bi_= anElement->GetAtomicShell(i-1);
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G4double Bi = anElement->GetAtomicShell(i);
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//G4cout<<Bi_<<'\t'<<Bi<<G4endl;
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if (electronEnergy <Bi_-Bi) {
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gammaEnergy = electronEnergy+Bi;
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CS=theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,0.,0.,0.);
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if (CS>0) adjointCS +=CS/gammaEnergy;
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}
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shell_prob[index_element][i] = adjointCS;
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}
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adjointCS*=electronEnergy;
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return adjointCS;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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void G4AdjointPhotoElectricModel::DefineCurrentMaterialAndElectronEnergy(const G4MaterialCutsCouple* couple, G4double anEnergy)
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{ currentCouple = const_cast<G4MaterialCutsCouple*> (couple);
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currentMaterial = const_cast<G4Material*> (couple->GetMaterial());
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currentCoupleIndex = couple->GetIndex();
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currentMaterialIndex = currentMaterial->GetIndex();
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current_eEnergy = anEnergy;
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theDirectPEEffectModel->SetCurrentCouple(couple);
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}
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