Gabriele Cosmo
129 lines
6.0 KiB
C++
129 lines
6.0 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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// G4AdjointPosOnPhysVolGenerator
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//
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// Class description:
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//
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// This class is responsible for the generation of primary adjoint particles
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// on the external surface of a user selected volume.
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// The particles are generated uniformly on the surface with the angular
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// distribution set to a cosine law relative to normal of the surface.
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// It is equivalent to the flux going in from the surface if an isotropic flux
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// is considered outside.
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// It uses ray tracking technique and can be applied to all kind of convex
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// volumes. Using the ray tracking technique the area of the external surface
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// is also computed. The area is needed to fix the weight of the primary
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// adjoint particle.
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// At the time of the development of this class, generation of points on
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// volume surface and computation of surface was limited in Geant4, therefore
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// the general ray tracking technique was adopted. The direct method in
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// G4VSolid could be now (2009) used instead.
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// Author: L. Desorgher, SpaceIT GmbH - 01.06.2006
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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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#ifndef G4AdjointPosOnPhysVolGenerator_hh
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#define G4AdjointPosOnPhysVolGenerator_hh 1
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#include "G4VPhysicalVolume.hh"
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#include "G4AffineTransform.hh"
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#include "G4ThreeVector.hh"
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class G4VSolid;
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class G4AdjointPosOnPhysVolGenerator
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{
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//---------
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public:
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//---------
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static G4AdjointPosOnPhysVolGenerator* GetInstance();
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G4VPhysicalVolume* DefinePhysicalVolume(const G4String& aName);
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void DefinePhysicalVolume1(const G4String& aName);
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G4double ComputeAreaOfExtSurface();
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G4double ComputeAreaOfExtSurface(G4int NStat);
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G4double ComputeAreaOfExtSurface(G4double epsilon);
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G4double ComputeAreaOfExtSurface(G4VSolid* aSolid);
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G4double ComputeAreaOfExtSurface(G4VSolid* aSolid,G4int NStat);
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G4double ComputeAreaOfExtSurface(G4VSolid* aSolid,G4double epsilon);
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void GenerateAPositionOnTheExtSurfaceOfASolid(G4VSolid* aSolid,
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G4ThreeVector& p,
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G4ThreeVector& direction);
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void GenerateAPositionOnTheExtSurfaceOfTheSolid(G4ThreeVector& p,
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G4ThreeVector& direction);
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void GenerateAPositionOnTheExtSurfaceOfThePhysicalVolume(G4ThreeVector& p,
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G4ThreeVector& direction);
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void GenerateAPositionOnTheExtSurfaceOfThePhysicalVolume(G4ThreeVector& p,
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G4ThreeVector& direction,
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G4double& costh_to_normal);
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inline void SetSolid(G4VSolid* aSolid)
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{ theSolid=aSolid; }
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inline G4double GetAreaOfExtSurfaceOfThePhysicalVolume()
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{ return AreaOfExtSurfaceOfThePhysicalVolume; }
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inline G4double GetCosThDirComparedToNormal()
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{ return CosThDirComparedToNormal; }
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//---------
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private: // private methods
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//---------
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G4AdjointPosOnPhysVolGenerator() = default;
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~G4AdjointPosOnPhysVolGenerator() = default;
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G4double ComputeAreaOfExtSurfaceStartingFromSphere(G4VSolid* aSolid,
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G4int NStat);
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G4double ComputeAreaOfExtSurfaceStartingFromBox(G4VSolid* aSolid,
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G4int NStat);
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void GenerateAPositionOnASolidBoundary(G4VSolid* aSolid,
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G4ThreeVector& p,
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G4ThreeVector& direction);
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G4double GenerateAPositionOnASphereBoundary(G4VSolid* aSolid,
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G4ThreeVector& p,
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G4ThreeVector& direction);
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G4double GenerateAPositionOnABoxBoundary(G4VSolid* aSolid,
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G4ThreeVector& p,
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G4ThreeVector& direction);
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void ComputeTransformationFromPhysVolToWorld();
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//---------
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private: // attributes
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//---------
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static G4ThreadLocal G4AdjointPosOnPhysVolGenerator* theInstance;
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G4VSolid* theSolid = nullptr;
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G4VPhysicalVolume* thePhysicalVolume = nullptr;
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G4bool UseSphere{true};
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G4String ModelOfSurfaceSource{"OnSolid"};
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G4AffineTransform theTransformationFromPhysVolToWorld;
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G4double AreaOfExtSurfaceOfThePhysicalVolume{0.};
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G4double CosThDirComparedToNormal{0.};
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};
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#endif
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