phonon/src/XPhononStackingAction.cc

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