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25 //
26 /// \file processes/phonon/src/G4PhononScattering.cc
27 /// \brief Implementation of the G4PhononScattering class
28 //
29 //
30 // 20131111 Add verbose output for MFP calculation
31
32 #include "G4PhononScattering.hh"
33 #include "G4LatticePhysical.hh"
34 #include "G4PhononPolarization.hh"
35 #include "G4PhononLong.hh"
36 #include "G4PhononTrackMap.hh"
37 #include "G4PhononTransFast.hh"
38 #include "G4PhononTransSlow.hh"
39 #include "G4PhysicalConstants.hh"
40 #include "G4RandomDirection.hh"
41 #include "G4Step.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4VParticleChange.hh"
44 #include "Randomize.hh"
45
46
47 G4PhononScattering::G4PhononScattering(const G4String& aName)
48 : G4VPhononProcess(aName) {;}
49
50 G4PhononScattering::~G4PhononScattering() {;}
51
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
53
54 G4double G4PhononScattering::GetMeanFreePath(const G4Track& aTrack,
55 G4double /*previousStepSize*/,
56 G4ForceCondition* condition) {
57 //Dynamical constants retrieved from PhysicalLattice
58 G4double B = theLattice->GetScatteringConstant();
59 G4double Eoverh = aTrack.GetKineticEnergy()/h_Planck;
60
61 //Calculate mean free path
62 G4double mfp = aTrack.GetVelocity()/(Eoverh*Eoverh*Eoverh*Eoverh*B);
63
64 if (verboseLevel > 1)
65 G4cout << "G4PhononScattering::GetMeanFreePath = " << mfp << G4endl;
66
67 *condition = NotForced;
68
69 return mfp;
70 }
71
72 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
73
74 G4VParticleChange* G4PhononScattering::PostStepDoIt( const G4Track& aTrack,
75 const G4Step& aStep) {
76 G4StepPoint* postStepPoint = aStep.GetPostStepPoint();
77 if (postStepPoint->GetStepStatus()==fGeomBoundary) {
78 return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep);
79 }
80
81 //Initialize particle change
82 aParticleChange.Initialize(aTrack);
83
84 //randomly generate a new direction and polarization state
85 G4ThreeVector newDir = G4RandomDirection();
86 G4int polarization = ChoosePolarization(theLattice->GetLDOS(),
87 theLattice->GetSTDOS(),
88 theLattice->GetFTDOS());
89
90 // Generate the new track after scattering
91 // FIXME: If polarization state is the same, just step the track!
92 G4Track* sec =
93 CreateSecondary(polarization, newDir, aTrack.GetKineticEnergy());
94 aParticleChange.SetNumberOfSecondaries(1);
95 aParticleChange.AddSecondary(sec);
96
97 // Scattered phonon replaces current track
98 aParticleChange.ProposeEnergy(0.);
99 aParticleChange.ProposeTrackStatus(fStopAndKill);
100
101 return &aParticleChange;
102 }
103
104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
105