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25 //
26 /// \file processes/phonon/src/G4PhononReflection.cc
27 /// \brief Implementation of the G4PhononReflection class
28 //
29 // This process handles the interaction of phonons with
30 // boundaries. Implementation of this class is highly
31 // geometry dependent.Currently, phonons are killed when
32 // they reach a boundary. If the other side of the
33 // boundary was Al, a hit is registered.
34 //
35 //
36 // 20131115 Throw exception if track's polarization state is invalid.
37
38 #include "G4PhononReflection.hh"
39 #include "G4ExceptionSeverity.hh"
40 #include "G4GeometryTolerance.hh"
41 #include "G4LatticePhysical.hh"
42 #include "G4PhononLong.hh"
43 #include "G4PhononTransFast.hh"
44 #include "G4PhononTransSlow.hh"
45 #include "G4PhysicalConstants.hh"
46 #include "G4Step.hh"
47 #include "G4StepPoint.hh"
48 #include "G4SystemOfUnits.hh"
49 #include "G4VParticleChange.hh"
50
51
52 G4PhononReflection::G4PhononReflection(const G4String& aName)
53 : G4VPhononProcess(aName),
54 kCarTolerance(G4GeometryTolerance::GetInstance()->GetSurfaceTolerance()) {;}
55
56 G4PhononReflection::~G4PhononReflection() {;}
57
58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
59
60 // Always return DBL_MAX and Forced. This ensures that the process is
61 // called at the end of every step. In PostStepDoIt the process
62 // decides whether the step encountered a volume boundary and a
63 // reflection should be applied
64
65 G4double G4PhononReflection::GetMeanFreePath(const G4Track&, G4double,
66 G4ForceCondition* condition) {
67 *condition = Forced;
68 return DBL_MAX;
69 }
70
71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
72
73 // This process handles the interaction of phonons with
74 // boundaries. Implementation of this class is highly geometry
75 // dependent.Currently, phonons are killed when they reach a
76 // boundary. If the other side of the boundary was Al, a hit is
77 // registered.
78
79 G4VParticleChange* G4PhononReflection::PostStepDoIt(const G4Track& aTrack,
80 const G4Step& aStep) {
81 aParticleChange.Initialize(aTrack);
82
83 //Check if current step is limited by a volume boundary
84 G4StepPoint* postStepPoint = aStep.GetPostStepPoint();
85 if (postStepPoint->GetStepStatus()!=fGeomBoundary) {
86 //make sure that correct phonon velocity is used after the step
87 int pol = GetPolarization(aTrack);
88 if (pol < 0 || pol > 2) {
89 G4Exception("G4PhononReflection::PostStepDoIt","Phonon001",
90 EventMustBeAborted, "Track is not a phonon");
91 return &aParticleChange; // NOTE: Will never get here
92 }
93
94 // FIXME: This should be using wave-vector, shouldn't it?
95 G4double vg = theLattice->MapKtoV(pol, aTrack.GetMomentumDirection());
96
97 //Since step was not a volume boundary, just set correct phonon velocity and return
98 aParticleChange.ProposeVelocity(vg);
99 return &aParticleChange;
100 }
101
102 // do nothing but return is the step is too short
103 // This is to allow actual reflection where after
104 // the first boundary crossing a second, infinitesimal
105 // step occurs crossing back into the original volume
106 if (aTrack.GetStepLength()<=kCarTolerance/2) {
107 return &aParticleChange;
108 }
109
110 G4double eKin = aTrack.GetKineticEnergy();
111 aParticleChange.ProposeNonIonizingEnergyDeposit(eKin);
112 aParticleChange.ProposeTrackStatus(fStopAndKill);
113
114 return &aParticleChange;
115 }
116
117 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
118
119
120