Gabriele Cosmo
95 lines
4.4 KiB
C++
95 lines
4.4 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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////////////////////////////////////////////////////////////////////////////////
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// Class: G4AdjointPhotoElectricModel
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// Author: L. Desorgher
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// Organisation: SpaceIT GmbH
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//
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// Model for the adjoint photo electric process.
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// Put a higher limit on the CS to avoid a high rate of Inverse Photo e-effect
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// at low energy. The very high adjoint CS of the reverse photo electric
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// reaction produce a high rate of reverse photo electric reaction in the inner
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// side of a shielding for eaxmple, the correction of this occurrence by weight
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// correction in the StepDoIt method is not statistically sufficient at small
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// energy. The problem is partially solved by setting a higher CS limit and
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// compensating it by an extra weight correction factor. However when coupling
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// it with other reverse processes the reverse photo-electric is still the
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// source of very occasional high weights that decrease the efficiency of the
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// computation. A way to solve this problemn is still needed but is difficult
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// to find as it happens in rare cases but does give a weight that is outside
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// the normal distribution. (Very Tricky!)
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//
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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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class G4AdjointPhotoElectricModel : public G4VEmAdjointModel
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{
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public:
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G4AdjointPhotoElectricModel();
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~G4AdjointPhotoElectricModel() override;
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void SampleSecondaries(const G4Track& aTrack, G4bool isScatProjToProj,
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G4ParticleChange* fParticleChange) override;
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G4double AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
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G4double primEnergy,
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G4bool isScatProjToProj) override;
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G4double AdjointCrossSectionPerAtom(const G4Element* anElement,
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G4double electronEnergy);
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G4AdjointPhotoElectricModel(G4AdjointPhotoElectricModel&) = delete;
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G4AdjointPhotoElectricModel& operator=(
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const G4AdjointPhotoElectricModel& right) = delete;
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protected:
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void CorrectPostStepWeight(G4ParticleChange* fParticleChange,
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G4double old_weight, G4double adjointPrimKinEnergy,
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G4double projectileKinEnergy,
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G4bool isScatProjToProj) override;
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private:
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void DefineCurrentMaterialAndElectronEnergy(
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const G4MaterialCutsCouple* aCouple, G4double eEnergy);
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G4double fShellProb[40][40];
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G4double fXsec[40];
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G4double fTotAdjointCS = 0.;
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G4double fFactorCSBiasing = 1.;
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G4double fPreStepAdjointCS = 0.;
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G4double fPostStepAdjointCS = 0.;
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G4double fCurrenteEnergy = 0.;
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size_t fIndexElement = 0;
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};
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#endif
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