Gabriele Cosmo
138 lines
5.1 KiB
C++
138 lines
5.1 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: G4AdjointAlongStepWeightCorrection.hh 66892 2013-01-17 10:57:59Z gunter $
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//
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/////////////////////////////////////////////////////////////////////////////////
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// Class: G4AdjointAlongStepWeightCorrection
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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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// 10 May 2007 creation by L. Desorgher
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// October 2009 implementation of the mode where the total adjoint and forward cross sections are equivalent. L. Desorgher
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//
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//-------------------------------------------------------------
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// Documentation:
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// Continuous processes acting on adjoint particles to correct continuously their weight during the adjoint reverse tracking.
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// Thi process is needed whene the adjoint cross section are not scaled such that the total adjoint cross section match the total forward cross section.
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// By default the mode where the total adjoint cross section is equal to the total forward cross section is used an therefore this along step weight
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// correction factor is 1.
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// However in some cases (some energy ranges) the total forward cross section or the total adjoint cross section can be null, in this case the along step
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// weight correction is neede and is given by exp(-(Sigma_tot_adj-Sigma_tot_fwd).dx)
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//
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//
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//
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#ifndef G4AdjointAlongStepWeightCorrection_h
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#define G4AdjointAlongStepWeightCorrection_h 1
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#include "G4VContinuousProcess.hh"
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#include "globals.hh"
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#include "G4Material.hh"
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#include "G4MaterialCutsCouple.hh"
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#include "G4Track.hh"
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#include "G4ParticleChange.hh"
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class G4Step;
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class G4ParticleDefinition;
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class G4AdjointAlongStepWeightCorrection : public G4VContinuousProcess
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{
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public:
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G4AdjointAlongStepWeightCorrection(const G4String& name = "ContinuousWeightCorrection",
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G4ProcessType type = fElectromagnetic);
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virtual ~G4AdjointAlongStepWeightCorrection();
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protected:
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virtual G4double GetContinuousStepLimit(const G4Track& track,
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G4double previousStepSize,
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G4double currentMinimumStep,
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G4double& currentSafety);
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//------------------------------------------------------------------------
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// Generic methods common to all processes
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//------------------------------------------------------------------------
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public:
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void PreparePhysicsTable(const G4ParticleDefinition&);
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void BuildPhysicsTable(const G4ParticleDefinition&);
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G4VParticleChange* AlongStepDoIt(const G4Track&, const G4Step&);
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private:
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void DefineMaterial(const G4MaterialCutsCouple* couple);
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G4AdjointAlongStepWeightCorrection(G4AdjointAlongStepWeightCorrection &);
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G4AdjointAlongStepWeightCorrection & operator=(const G4AdjointAlongStepWeightCorrection &right);
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protected:
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G4ParticleChange* fParticleChange;
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private:
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const G4Material* currentMaterial;
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const G4MaterialCutsCouple* currentCouple;
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size_t currentMaterialIndex;
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G4double preStepKinEnergy;
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};
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inline void G4AdjointAlongStepWeightCorrection::DefineMaterial(
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const G4MaterialCutsCouple* couple)
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{
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if(couple != currentCouple) {
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currentCouple = couple;
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currentMaterial = couple->GetMaterial();
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currentMaterialIndex = couple->GetIndex();
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}
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}
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#endif
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