| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | // $Id: G4AdjointPhotoElectricModel.hh,v 1.4 2009/11/20 10:31:20 ldesorgh Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $
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| 28 | //
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| 29 | /////////////////////////////////////////////////////////////////////////////////
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| 30 | // Module: G4AdjointPhotoElectricModel
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| 31 | // Author: L. Desorgher
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| 32 | // Organisation: SpaceIT GmbH
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| 33 | // Contract: ESA contract 21435/08/NL/AT
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| 34 | // Customer: ESA/ESTEC
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| 35 | /////////////////////////////////////////////////////////////////////////////////
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| 36 | //
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| 37 | // CHANGE HISTORY
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| 38 | // --------------
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| 39 | // ChangeHistory:
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| 40 | // -1 September 2007 creation by L. Desorgher
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| 41 | //
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| 42 | // -January 2009. L. Desorgher
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| 43 | // 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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| 44 | // 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 occurence
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| 45 | // 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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| 46 | // 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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| 47 | // 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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| 48 | // 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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| 49 | //
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| 50 | // -October 2009 Correction of Element sampling. L. Desorgher
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| 51 | //
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| 52 | //-------------------------------------------------------------
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| 53 | // Documentation:
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| 54 | // Model for the adjoint photo electric process
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| 55 | //
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| 56 | #ifndef G4AdjointPhotoElectricModel_h
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| 57 | #define G4AdjointPhotoElectricModel_h 1
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| 58 |
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| 59 |
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| 60 | #include "globals.hh"
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| 61 | #include "G4VEmAdjointModel.hh"
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| 62 | #include "G4PEEffectModel.hh"
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| 63 | class G4AdjointPhotoElectricModel: public G4VEmAdjointModel
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| 64 |
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| 65 | {
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| 66 | public:
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| 67 |
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| 68 | G4AdjointPhotoElectricModel();
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| 69 | ~G4AdjointPhotoElectricModel();
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| 70 |
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| 71 |
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| 72 |
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| 73 | virtual void SampleSecondaries(const G4Track& aTrack,
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| 74 | G4bool IsScatProjToProjCase,
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| 75 | G4ParticleChange* fParticleChange);
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| 76 | virtual G4double AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
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| 77 | G4double primEnergy,
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| 78 | G4bool IsScatProjToProjCase);
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| 79 |
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| 80 | G4double AdjointCrossSectionPerAtom(const G4Element* anElement,G4double electronEnergy);
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| 81 |
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| 82 |
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| 83 |
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| 84 | inline void SetTheDirectPEEffectModel(G4PEEffectModel* aModel){theDirectPEEffectModel = aModel;
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| 85 | DefineDirectEMModel(aModel);}
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| 86 |
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| 87 | virtual void CorrectPostStepWeight(G4ParticleChange* fParticleChange,
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| 88 | G4double old_weight,
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| 89 | G4double adjointPrimKinEnergy,
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| 90 | G4double projectileKinEnergy,
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| 91 | G4bool IsScatProjToProjCase);
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| 92 |
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| 93 |
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| 94 | private:
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| 95 | G4double xsec[40];
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| 96 | G4double totAdjointCS;
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| 97 | G4double totBiasedAdjointCS;
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| 98 | G4double factorCSBiasing;
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| 99 | G4double pre_step_AdjointCS;
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| 100 | G4double post_step_AdjointCS;
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| 101 |
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| 102 |
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| 103 | G4double shell_prob[40][40];
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| 104 |
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| 105 |
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| 106 | G4PEEffectModel* theDirectPEEffectModel;
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| 107 | size_t index_element;
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| 108 | G4double current_eEnergy;
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| 109 |
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| 110 |
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| 111 | private:
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| 112 | void DefineCurrentMaterialAndElectronEnergy(const G4MaterialCutsCouple* aCouple,
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| 113 | G4double eEnergy);
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| 114 |
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| 115 | };
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| 116 |
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| 117 | #endif
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