Gabriele Cosmo
350 lines
12 KiB
C++
350 lines
12 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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// $Id$
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//
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//
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////////////////////////////////////////////////////////////////////////
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// Optical Photon Boundary Process Class Definition
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////////////////////////////////////////////////////////////////////////
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//
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// File: G4OpBoundaryProcess.hh
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// Description: Discrete Process -- reflection/refraction at
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// optical interfaces
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// Version: 1.1
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// Created: 1997-06-18
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// Modified: 2005-07-28 add G4ProcessType to constructor
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// 1999-10-29 add method and class descriptors
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// 1999-10-10 - Fill NewMomentum/NewPolarization in
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// DoAbsorption. These members need to be
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// filled since DoIt calls
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// aParticleChange.SetMomentumChange etc.
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// upon return (thanks to: Clark McGrew)
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// 2006-11-04 - add capability of calculating the reflectivity
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// off a metal surface by way of a complex index
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// of refraction - Thanks to Sehwook Lee and John
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// Hauptman (Dept. of Physics - Iowa State Univ.)
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// 2009-11-10 - add capability of simulating surface reflections
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// with Look-Up-Tables (LUT) containing measured
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// optical reflectance for a variety of surface
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// treatments - Thanks to Martin Janecek and
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// William Moses (Lawrence Berkeley National Lab.)
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//
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// Author: Peter Gumplinger
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// adopted from work by Werner Keil - April 2/96
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// mail: gum@triumf.ca
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//
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////////////////////////////////////////////////////////////////////////
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#ifndef G4OpBoundaryProcess_h
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#define G4OpBoundaryProcess_h 1
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/////////////
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// Includes
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/////////////
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#include "globals.hh"
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#include "templates.hh"
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#include "geomdefs.hh"
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#include "Randomize.hh"
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#include "G4RandomTools.hh"
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#include "G4RandomDirection.hh"
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#include "G4Step.hh"
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#include "G4VDiscreteProcess.hh"
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#include "G4DynamicParticle.hh"
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#include "G4Material.hh"
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#include "G4LogicalBorderSurface.hh"
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#include "G4LogicalSkinSurface.hh"
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#include "G4OpticalSurface.hh"
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#include "G4OpticalPhoton.hh"
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#include "G4TransportationManager.hh"
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// Class Description:
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// Discrete Process -- reflection/refraction at optical interfaces.
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// Class inherits publicly from G4VDiscreteProcess.
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// Class Description - End:
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/////////////////////
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// Class Definition
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/////////////////////
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enum G4OpBoundaryProcessStatus { Undefined,
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FresnelRefraction, FresnelReflection,
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TotalInternalReflection,
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LambertianReflection, LobeReflection,
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SpikeReflection, BackScattering,
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Absorption, Detection, NotAtBoundary,
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SameMaterial, StepTooSmall, NoRINDEX,
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PolishedLumirrorAirReflection,
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PolishedLumirrorGlueReflection,
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PolishedAirReflection,
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PolishedTeflonAirReflection,
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PolishedTiOAirReflection,
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PolishedTyvekAirReflection,
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PolishedVM2000AirReflection,
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PolishedVM2000GlueReflection,
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EtchedLumirrorAirReflection,
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EtchedLumirrorGlueReflection,
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EtchedAirReflection,
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EtchedTeflonAirReflection,
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EtchedTiOAirReflection,
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EtchedTyvekAirReflection,
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EtchedVM2000AirReflection,
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EtchedVM2000GlueReflection,
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GroundLumirrorAirReflection,
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GroundLumirrorGlueReflection,
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GroundAirReflection,
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GroundTeflonAirReflection,
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GroundTiOAirReflection,
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GroundTyvekAirReflection,
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GroundVM2000AirReflection,
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GroundVM2000GlueReflection };
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class G4OpBoundaryProcess : public G4VDiscreteProcess
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{
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public:
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////////////////////////////////
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// Constructors and Destructor
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////////////////////////////////
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G4OpBoundaryProcess(const G4String& processName = "OpBoundary",
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G4ProcessType type = fOptical);
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~G4OpBoundaryProcess();
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private:
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G4OpBoundaryProcess(const G4OpBoundaryProcess &right);
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//////////////
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// Operators
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//////////////
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G4OpBoundaryProcess& operator=(const G4OpBoundaryProcess &right);
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public:
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////////////
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// Methods
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////////////
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G4bool IsApplicable(const G4ParticleDefinition& aParticleType);
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// Returns true -> 'is applicable' only for an optical photon.
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G4double GetMeanFreePath(const G4Track& ,
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G4double ,
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G4ForceCondition* condition);
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// Returns infinity; i. e. the process does not limit the step,
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// but sets the 'Forced' condition for the DoIt to be invoked at
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// every step. However, only at a boundary will any action be
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// taken.
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G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
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const G4Step& aStep);
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// This is the method implementing boundary processes.
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G4OpBoundaryProcessStatus GetStatus() const;
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// Returns the current status.
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private:
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G4bool G4BooleanRand(const G4double prob) const;
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G4ThreeVector GetFacetNormal(const G4ThreeVector& Momentum,
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const G4ThreeVector& Normal) const;
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void DielectricMetal();
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void DielectricDielectric();
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void DielectricLUT();
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void ChooseReflection();
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void DoAbsorption();
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void DoReflection();
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G4double GetIncidentAngle();
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// Returns the incident angle of optical photon
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G4double GetReflectivity(G4double E1_perp,
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G4double E1_parl,
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G4double incidentangle,
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G4double RealRindex,
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G4double ImaginaryRindex);
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// Returns the Reflectivity on a metalic surface
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void CalculateReflectivity(void);
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void BoundaryProcessVerbose(void) const;
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private:
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G4double thePhotonMomentum;
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G4ThreeVector OldMomentum;
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G4ThreeVector OldPolarization;
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G4ThreeVector NewMomentum;
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G4ThreeVector NewPolarization;
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G4ThreeVector theGlobalNormal;
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G4ThreeVector theFacetNormal;
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G4Material* Material1;
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G4Material* Material2;
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G4OpticalSurface* OpticalSurface;
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G4MaterialPropertyVector* PropertyPointer;
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G4MaterialPropertyVector* PropertyPointer1;
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G4MaterialPropertyVector* PropertyPointer2;
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G4double Rindex1;
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G4double Rindex2;
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G4double cost1, cost2, sint1, sint2;
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G4OpBoundaryProcessStatus theStatus;
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G4OpticalSurfaceModel theModel;
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G4OpticalSurfaceFinish theFinish;
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G4double theReflectivity;
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G4double theEfficiency;
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G4double theTransmittance;
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G4double prob_sl, prob_ss, prob_bs;
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G4int iTE, iTM;
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G4double kCarTolerance;
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};
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////////////////////
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// Inline methods
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////////////////////
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inline
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G4bool G4OpBoundaryProcess::G4BooleanRand(const G4double prob) const
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{
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/* Returns a random boolean variable with the specified probability */
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return (G4UniformRand() < prob);
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}
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inline
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G4bool G4OpBoundaryProcess::IsApplicable(const G4ParticleDefinition&
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aParticleType)
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{
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return ( &aParticleType == G4OpticalPhoton::OpticalPhoton() );
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}
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inline
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G4OpBoundaryProcessStatus G4OpBoundaryProcess::GetStatus() const
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{
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return theStatus;
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}
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inline
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void G4OpBoundaryProcess::ChooseReflection()
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{
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G4double rand = G4UniformRand();
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if ( rand >= 0.0 && rand < prob_ss ) {
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theStatus = SpikeReflection;
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theFacetNormal = theGlobalNormal;
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}
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else if ( rand >= prob_ss &&
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rand <= prob_ss+prob_sl) {
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theStatus = LobeReflection;
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}
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else if ( rand > prob_ss+prob_sl &&
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rand < prob_ss+prob_sl+prob_bs ) {
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theStatus = BackScattering;
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}
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else {
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theStatus = LambertianReflection;
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}
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}
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inline
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void G4OpBoundaryProcess::DoAbsorption()
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{
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theStatus = Absorption;
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if ( G4BooleanRand(theEfficiency) ) {
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// EnergyDeposited =/= 0 means: photon has been detected
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theStatus = Detection;
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aParticleChange.ProposeLocalEnergyDeposit(thePhotonMomentum);
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}
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else {
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aParticleChange.ProposeLocalEnergyDeposit(0.0);
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}
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NewMomentum = OldMomentum;
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NewPolarization = OldPolarization;
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// aParticleChange.ProposeEnergy(0.0);
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aParticleChange.ProposeTrackStatus(fStopAndKill);
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}
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inline
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void G4OpBoundaryProcess::DoReflection()
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{
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if ( theStatus == LambertianReflection ) {
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NewMomentum = G4LambertianRand(theGlobalNormal);
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theFacetNormal = (NewMomentum - OldMomentum).unit();
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}
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else if ( theFinish == ground ) {
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theStatus = LobeReflection;
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if ( PropertyPointer1 && PropertyPointer2 ){
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} else {
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theFacetNormal =
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GetFacetNormal(OldMomentum,theGlobalNormal);
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}
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G4double PdotN = OldMomentum * theFacetNormal;
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NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal;
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}
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else {
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theStatus = SpikeReflection;
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theFacetNormal = theGlobalNormal;
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G4double PdotN = OldMomentum * theFacetNormal;
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NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal;
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}
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G4double EdotN = OldPolarization * theFacetNormal;
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NewPolarization = -OldPolarization + (2.*EdotN)*theFacetNormal;
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}
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#endif /* G4OpBoundaryProcess_h */
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