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25 //
26 /// \file exoticphysics/phonon/src/XPhononStackingAction.cc
27 /// \brief Implementation of the XPhononStackingAction class
28 /// This stacking action is necessary to ensure that velocity and
29 /// propagation direction are set properly for phonons created with
30 /// G4ParticleGun
31 //
32 //
33
34 #include "XPhononStackingAction.hh"
35
36 #include "G4LatticeManager.hh"
37 #include "G4PhononLong.hh"
38 #include "G4PhononPolarization.hh"
39 #include "G4PhononTrackMap.hh"
40 #include "G4PhononTransFast.hh"
41 #include "G4PhononTransSlow.hh"
42 #include "G4RandomDirection.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "G4ThreeVector.hh"
45 #include "G4Track.hh"
46 #include "G4TrackStatus.hh"
47
48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
49
50 XPhononStackingAction::XPhononStackingAction()
51 {
52 ;
53 }
54
55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
56
57 XPhononStackingAction::~XPhononStackingAction()
58 {
59 ;
60 }
61
62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63
64 G4ClassificationOfNewTrack XPhononStackingAction::ClassifyNewTrack(const G4Track* aTrack)
65 {
66 G4ClassificationOfNewTrack classification = fUrgent;
67
68 if (aTrack->GetParentID() == 0) {
69 // Obtain LatticeManager for phonon dynamics
70 G4LatticeManager* LM = G4LatticeManager::GetLatticeManager();
71
72 G4int pol = G4PhononPolarization::Get(aTrack->GetDefinition());
73
74 // Compute random wave-vector (override whatever ParticleGun did)
75 G4ThreeVector Ran = G4RandomDirection();
76
77 // Store wave-vector as track information
78 G4PhononTrackMap* theKmap = G4PhononTrackMap::GetPhononTrackMap();
79 theKmap->SetK(aTrack, Ran);
80
81 // Compute direction of propagation from wave vector
82 G4ThreeVector momentumDir = LM->MapKtoVDir(aTrack->GetVolume(), pol, Ran);
83
84 // Compute true velocity of propagation
85 G4double velocity = LM->MapKtoV(aTrack->GetVolume(), pol, Ran);
86
87 // cast to non-const pointer so we can set the velocity
88 G4Track* theTrack = const_cast<G4Track*>(aTrack);
89
90 theTrack->SetMomentumDirection(momentumDir);
91 theTrack->SetVelocity(velocity);
92 theTrack->UseGivenVelocity(true);
93 }
94
95 return classification;
96 }
97
98 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
99