phonon/src/XPhononStackingAction.cc

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0025 //
0026 /// \file XPhononStackingAction.cc
0027 /// \brief Implementation of the XPhononStackingAction class
0028
0029 ///     This stacking action is necessary to ensure that velocity and
0030 ///     propagation direction are set properly for phonons created with
0031 ///     G4ParticleGun
0032 //
0033 //
0034
0035 #include "XPhononStackingAction.hh"
0036
0037 #include "G4LatticeManager.hh"
0038 #include "G4PhononLong.hh"
0039 #include "G4PhononPolarization.hh"
0040 #include "G4PhononTrackMap.hh"
0041 #include "G4PhononTransFast.hh"
0042 #include "G4PhononTransSlow.hh"
0043 #include "G4RandomDirection.hh"
0044 #include "G4SystemOfUnits.hh"
0045 #include "G4ThreeVector.hh"
0046 #include "G4Track.hh"
0047 #include "G4TrackStatus.hh"
0048
0049 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0050
0051 XPhononStackingAction::XPhononStackingAction()
0052 {
0053   ;
0054 }
0055
0056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0057
0058 XPhononStackingAction::~XPhononStackingAction()
0059 {
0060   ;
0061 }
0062
0063 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0064
0065 G4ClassificationOfNewTrack XPhononStackingAction::ClassifyNewTrack(const G4Track* aTrack)
0066 {
0067   G4ClassificationOfNewTrack classification = fUrgent;
0068
0069   if (aTrack->GetParentID() == 0) {
0070     // Obtain LatticeManager for phonon dynamics
0071     G4LatticeManager* LM = G4LatticeManager::GetLatticeManager();
0072
0073     G4int pol = G4PhononPolarization::Get(aTrack->GetDefinition());
0074
0075     // Compute random wave-vector (override whatever ParticleGun did)
0076     G4ThreeVector Ran = G4RandomDirection();
0077
0078     // Store wave-vector as track information
0079     G4PhononTrackMap* theKmap = G4PhononTrackMap::GetPhononTrackMap();
0080     theKmap->SetK(aTrack, Ran);
0081
0082     // Compute direction of propagation from wave vector
0083     G4ThreeVector momentumDir = LM->MapKtoVDir(aTrack->GetVolume(), pol, Ran);
0084
0085     // Compute true velocity of propagation
0086     G4double velocity = LM->MapKtoV(aTrack->GetVolume(), pol, Ran);
0087
0088     // cast to non-const pointer so we can set the velocity
0089     G4Track* theTrack = const_cast<G4Track*>(aTrack);
0090
0091     theTrack->SetMomentumDirection(momentumDir);
0092     theTrack->SetVelocity(velocity);
0093     theTrack->UseGivenVelocity(true);
0094   }
0095
0096   return classification;
0097 }
0098
0099 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....