Gabriele Cosmo
119 lines
4.9 KiB
C++
119 lines
4.9 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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// Module: G4AdjointPhotoElectricModel
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// Author: L. Desorgher
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// Organisation: SpaceIT GmbH
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// Contract: ESA contract 21435/08/NL/AT
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// Customer: ESA/ESTEC
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/////////////////////////////////////////////////////////////////////////////////
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//
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// CHANGE HISTORY
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// --------------
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// ChangeHistory:
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// -1 September 2007 creation by L. Desorgher
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//
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// -January 2009. L. Desorgher
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// Put a higher limit on the CS to avoid a high rate of Inverse Photo e- effect at low energy. The very high adjoint CS of the reverse
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// photo electric reaction produce a high rate of reverse photo electric reaction in the inner side of a shielding for eaxmple, the correction of this occurrence
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// by weight correction in the StepDoIt method is not statistically sufficient at small energy. The problem is partially solved by setting an higher CS limit
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// and compensating it by an extra weight correction factor. However when coupling it with other reverse processes the reverse photo-electric is still
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// the source of very occasional high weight that decrease the efficiency of the computation. A way to solve this problemn is still needed but is difficult
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// to find as it happens in rarea case but does give a weighrt that is outside the noemal distribution. (Very Tricky!)
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//
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// -October 2009 Correction of Element sampling. L. Desorgher
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//
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//-------------------------------------------------------------
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// Documentation:
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// Model for the adjoint photo electric process
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//
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#ifndef G4AdjointPhotoElectricModel_h
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#define G4AdjointPhotoElectricModel_h 1
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#include "globals.hh"
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#include "G4VEmAdjointModel.hh"
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#include "G4PEEffectFluoModel.hh"
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class G4AdjointPhotoElectricModel: public G4VEmAdjointModel
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{
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public:
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G4AdjointPhotoElectricModel();
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~G4AdjointPhotoElectricModel();
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virtual void SampleSecondaries(const G4Track& aTrack,
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G4bool IsScatProjToProjCase,
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G4ParticleChange* fParticleChange);
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virtual G4double AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
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G4double primEnergy,
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G4bool IsScatProjToProjCase);
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virtual G4double GetAdjointCrossSection(const G4MaterialCutsCouple* aCouple,
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G4double primEnergy,
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G4bool IsScatProjToProjCase);
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G4double AdjointCrossSectionPerAtom(const G4Element* anElement,G4double electronEnergy);
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inline void SetTheDirectPEEffectModel(G4PEEffectFluoModel* aModel){theDirectPEEffectModel = aModel;
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DefineDirectEMModel(aModel);}
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virtual void 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 IsScatProjToProjCase);
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private:
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G4double xsec[40];
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G4double totAdjointCS;
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G4double totBiasedAdjointCS;
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G4double factorCSBiasing;
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G4double pre_step_AdjointCS;
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G4double post_step_AdjointCS;
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G4double shell_prob[40][40];
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G4PEEffectFluoModel* theDirectPEEffectModel;
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size_t index_element;
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G4double current_eEnergy;
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private:
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void DefineCurrentMaterialAndElectronEnergy(const G4MaterialCutsCouple* aCouple,
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G4double eEnergy);
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};
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#endif
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