G4OpBoundaryProcess.hh

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