Gabriele Cosmo
398 lines
15 KiB
C++
398 lines
15 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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#include "G4Channeling.hh"
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#include "Randomize.hh"
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#include "G4ChannelingTrackData.hh"
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#include "G4TouchableHistory.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4LambdacPlus.hh"
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G4Channeling::G4Channeling():
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G4VDiscreteProcess("channeling"),
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fChannelingID(-1),
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fTimeStepMin(0.),
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fTimeStepMax(0.),
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fTransverseVariationMax(2.E-2 * CLHEP::angstrom),
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k010(G4ThreeVector(0.,1.,0.)){
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fChannelingID = G4PhysicsModelCatalog::GetIndex("channeling");
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if(fChannelingID == -1){
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fChannelingID = G4PhysicsModelCatalog::Register("channeling");
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}
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fSpin = G4ThreeVector(0.,0.,0.);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4Channeling::~G4Channeling(){;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4ChannelingTrackData* G4Channeling::GetTrackData(const G4Track& aTrack){
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G4ChannelingTrackData* trackdata =
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(G4ChannelingTrackData*)(aTrack.GetAuxiliaryTrackInformation(fChannelingID));
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if(trackdata == nullptr){
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trackdata = new G4ChannelingTrackData();
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aTrack.SetAuxiliaryTrackInformation(fChannelingID,trackdata);
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}
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return trackdata;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4Channeling::GetEF(const G4Track& aTrack,
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G4ThreeVector& pos,
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G4ThreeVector& out){
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out = G4ThreeVector((GetMatData(aTrack)->GetEFX()->GetEC(pos)),
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(GetMatData(aTrack)->GetEFY()->GetEC(pos)),
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0.);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4Channeling::PosToLattice(G4StepPoint* step,G4ThreeVector& pos){
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G4TouchableHistory* theTouchable = (G4TouchableHistory*)(step->GetTouchable());
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pos -= theTouchable->GetTranslation();
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pos = ((*theTouchable->GetRotation()).inverse())(pos);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4Channeling::UpdateParameters(const G4Track& aTrack){
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G4LogicalCrystalVolume* aLCV = (G4LogicalCrystalVolume*)(aTrack.GetVolume()->GetLogicalVolume());
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G4StepPoint* postStepPoint = aTrack.GetStep()->GetPostStepPoint();
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G4StepPoint* preStepPoint = aTrack.GetStep()->GetPreStepPoint();
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G4ThreeVector posPost = postStepPoint->GetPosition();
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aLCV->RotateToLattice(posPost);
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G4ThreeVector posPre = preStepPoint->GetPosition();
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aLCV->RotateToLattice(posPre);
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G4double integrationLimit = std::fabs(posPost.z() - posPre.z());
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if(integrationLimit > 0.){
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//----------------------------------------
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// Check if the crystal is bent
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//----------------------------------------
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G4bool isBent = GetMatData(aTrack)->IsBent();
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//----------------------------------------
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// Get the momentum in the world reference
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// frame and rotate to the solid reference frame
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//----------------------------------------
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G4TouchableHistory* theTouchable = (G4TouchableHistory*)(preStepPoint->GetTouchable());
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G4ThreeVector momWorld = aTrack.GetStep()->GetPreStepPoint()->GetMomentum();
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G4ThreeVector mom = (*theTouchable->GetRotation())(momWorld);
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//----------------------------------------
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// Get the momentum in the solid reference
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// frame and rotate to the crystal reference frame
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//----------------------------------------
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aLCV->RotateToLattice(mom);
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//----------------------------------------
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// Get the momentum in the crystal reference
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// frame and rotate to the reference frame
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// solidal to the bent planes
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//----------------------------------------
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if(isBent){
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PosToLattice(preStepPoint,posPre);
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G4ThreeVector axis010 = (*theTouchable->GetRotation())(k010);
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mom.rotate(axis010,-posPre.z()/GetMatData(aTrack)->GetBR(posPre).x());
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}
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//----------------------------------------
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// Take the position stored in the track data.
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// If the particle enters the crystal,
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// the position in the channel is randomly
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// generated using a uniform distribution
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//----------------------------------------
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G4ThreeVector pos;
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if(GetTrackData(aTrack)->GetPosCh().x() == DBL_MAX){
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G4double posX = G4UniformRand() * GetMatData(aTrack)->GetPot()->GetIntSp(0);
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G4double posY = G4UniformRand() * GetMatData(aTrack)->GetPot()->GetIntSp(1);
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pos = G4ThreeVector(posX,posY,0.);
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}
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else{
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pos = GetTrackData(aTrack)->GetPosCh();
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}
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G4double step=0., stepTot=0.;
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G4double nud =0., eld =0.;
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G4double efx =0., efy =0.;
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G4double nud_temp =0., eld_temp =0.;
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G4double beta = aTrack.GetVelocity()/CLHEP::c_light;
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G4double Z = GetParticleDefinition(aTrack)->GetPDGCharge();
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const G4double oneSixth = 1./6.;
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G4ThreeVector posk1,posk2,posk3,posk4,posk5,posk6;
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G4ThreeVector momk1,momk2,momk3,momk4,momk5,momk6;
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G4ThreeVector pos_temp, efxy;
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do{
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//----------------------------------------
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// Limit the variable step length for the
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// integration via the selected algorithm
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// and update variables for the integration
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//----------------------------------------
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UpdateIntegrationStep(aTrack,mom,step);
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if(step + stepTot > integrationLimit){
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step = integrationLimit - stepTot;
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}
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//----------------------------------------
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// Function integration algorithm
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// 4th Order Runge-Kutta
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//----------------------------------------
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GetEF(aTrack,pos,efxy);
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posk1 = step / mom.z() * mom;
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momk1 = step / beta * Z * efxy;
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if(isBent) momk1.setX(momk1.x() - step * mom.z() * beta / (GetMatData(aTrack)->GetBR(pos)).x());
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GetEF(aTrack,pos_temp = pos + posk1 * 0.5,efxy);
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posk2 = step / mom.z() * (mom + momk1 * 0.5);
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momk2 = step / beta * Z * efxy;
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if(isBent) momk2.setX(momk2.x() - step * mom.z() * beta / (GetMatData(aTrack)->GetBR(pos_temp)).x());
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GetEF(aTrack,pos_temp = pos + posk2 * 0.5,efxy);
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posk3 = step / mom.z() * (mom + momk2 * 0.5);
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momk3 = step / beta * Z * efxy;
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if(isBent) momk3.setX(momk3.x() - step * mom.z() * beta / (GetMatData(aTrack)->GetBR(pos_temp)).x());
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GetEF(aTrack,pos_temp = pos + posk3,efxy);
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posk4 = step / mom.z() * (mom + momk3);
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momk4 = step / beta * Z * efxy;
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if(isBent) momk4.setX(momk4.x() - step * mom.z() * beta / (GetMatData(aTrack)->GetBR(pos_temp)).x());
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pos = pos + oneSixth * (posk1 + 2.*posk2 + 2.*posk3 + posk4);
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mom = mom + oneSixth * (momk1 + 2.*momk2 + 2.*momk3 + momk4);
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//----------------------------------------
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// Function integration algorithm
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// 2th Order Velocity-Verlet
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//----------------------------------------
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/*
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GetEF(aTrack,pos,efxy);
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posk1 = pos + (step * 0.5 / mom.z()) * mom;
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//momk1 = mom + step * 0.5 / betaZ * efxy;
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momk1 = mom;
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if(isBent) momk1.setX(momk1.x() - step * 0.5 * mom.z() * beta / (GetMatData(aTrack)->GetBR(pos)).x());
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GetEF(aTrack,posk1,efxy);
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pos = pos + (step / momk1.z()) * momk1;
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//mom = mom + step / betaZ * efxy;
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mom = mom;
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if(isBent) mom.setX(mom.x() - step * mom.z() * beta / (GetMatData(aTrack)->GetBR(posk1)).x());
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*/
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//----------------------------------------
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// Update the total step and the electron
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// and nuclei density experienced by
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// the particle during its motion
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//----------------------------------------
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stepTot += step;
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nud_temp = GetMatData(aTrack)->GetNuD()->GetEC(pos);
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eld_temp = GetMatData(aTrack)->GetElD()->GetEC(pos);
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if(nud_temp < 0.) {nud_temp = 0.;}
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if(eld_temp < 0.) {eld_temp = 0.;}
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nud += (step * nud_temp);
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eld += (step * eld_temp);
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efx += (step * GetMatData(aTrack)->GetEFX()->GetEC(pos));
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efy += (step * GetMatData(aTrack)->GetEFY()->GetEC(pos));
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} while(stepTot<integrationLimit);
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nud /= stepTot;
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eld /= stepTot;
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if(nud < 1.E-10) {nud = 1.E-10;}
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if(eld < 1.E-10) {eld = 1.E-10;}
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GetTrackData(aTrack)->SetNuD(nud);
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GetTrackData(aTrack)->SetElD(eld);
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GetTrackData(aTrack)->SetEFX(efx);
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GetTrackData(aTrack)->SetEFY(efy);
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GetTrackData(aTrack)->SetMomCh(mom);
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GetTrackData(aTrack)->SetPosCh(pos);
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return true;
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}
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else{
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return false;
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}
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return false;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4Channeling::
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UpdateIntegrationStep(const G4Track& aTrack,
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G4ThreeVector& mom,
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G4double& step){
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if(mom.x() != 0.0 || mom.y() != 0.0){
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double xy2 = mom.x() * mom.x() + mom.y()*mom.y();
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if(xy2!=0.){
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step = std::fabs(fTransverseVariationMax * GetPre(aTrack)->GetKineticEnergy() / std::pow(xy2,0.5));
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if(step < fTimeStepMin) step = fTimeStepMin;
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else{
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fTimeStepMax = std::sqrt( fTransverseVariationMax * GetPre(aTrack)->GetKineticEnergy()
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/ std::fabs(GetMatData(aTrack)->GetEFX()->GetMax()));
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if(step > fTimeStepMax) step = fTimeStepMax;
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}
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}
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else{
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step = fTimeStepMin;
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}
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return true;
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}
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else{
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step = fTimeStepMin;
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}
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return false;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4Channeling::
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GetMeanFreePath(const G4Track& aTrack,
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G4double, // previousStepSize
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G4ForceCondition* condition){
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//----------------------------------------
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// the condition is forced to check if
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// the volume has a lattice at each step.
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// if it hasn't, return DBL_MAX
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//----------------------------------------
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*condition = Forced;
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G4LogicalVolume* aLV = aTrack.GetVolume()->GetLogicalVolume();
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G4LogicalVolume* aNLV = aTrack.GetNextVolume()->GetLogicalVolume();
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if(G4LogicalCrystalVolume::IsLattice(aLV) == true &&
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G4LogicalCrystalVolume::IsLattice(aNLV) == true){
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G4double osc_per = GetOscillationPeriod(aTrack);
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fTimeStepMin = osc_per * 2.E-4;
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return osc_per * 0.01;
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}
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else{
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GetTrackData(aTrack)->Reset();
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return DBL_MAX;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4VParticleChange* G4Channeling::
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PostStepDoIt(const G4Track& aTrack,
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const G4Step&){
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//----------------------------------------
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// check if the volume has a lattice
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// and if the particle is in channeling.
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// If it is so, the particle is forced
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// to follow the channeling plane
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// direction. If the particle has
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// dechanneled or exited the crystal,
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// the outgoing angle is evaluated
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//----------------------------------------
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aParticleChange.Initialize(aTrack);
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G4LogicalVolume* aLV = aTrack.GetVolume()->GetLogicalVolume();
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G4LogicalVolume* aNLV = aTrack.GetNextVolume()->GetLogicalVolume();
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if(G4LogicalCrystalVolume::IsLattice(aLV) == true &&
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G4LogicalCrystalVolume::IsLattice(aNLV) == true){
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G4bool bModifiedTraj = UpdateParameters(aTrack);
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if(bModifiedTraj==true){
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//----------------------------------------
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// Get the momentum in the reference frame
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// solidal to the bent planes and rotate
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// to the reference frame
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//----------------------------------------
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G4LogicalCrystalVolume* aLCV = (G4LogicalCrystalVolume*)(aTrack.GetVolume()->GetLogicalVolume());
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G4ThreeVector momCh = GetTrackData(aTrack)->GetMomCh();
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G4StepPoint* postStepPoint = aTrack.GetStep()->GetPostStepPoint();
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G4TouchableHistory* theTouchable = (G4TouchableHistory*)(postStepPoint->GetTouchable());
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if(GetMatData(aTrack)->IsBent()){
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G4ThreeVector posPost = postStepPoint->GetPosition();
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PosToLattice(postStepPoint,posPost);
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G4ThreeVector axis010 = (*theTouchable->GetRotation())(k010);
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momCh.rotate(axis010,posPost.z()/GetMatData(aTrack)->GetBR(posPost).x());
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}
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//----------------------------------------
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// Get the momentum in the crystal reference
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// frame and rotate to the solid reference frame
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//----------------------------------------
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aLCV->RotateToSolid(momCh);
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//----------------------------------------
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// Get the momentum in the solid reference
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// frame and rotate to the world reference frame
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//----------------------------------------
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G4ThreeVector mom = ((*theTouchable->GetRotation()).inverse())(momCh);
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aParticleChange.ProposeMomentumDirection(mom.unit());
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aParticleChange.ProposePolarization(fSpin);
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}
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}
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else{
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// if the volume has no lattice it resets the density factors
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GetTrackData(aTrack)->Reset();
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}
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return &aParticleChange;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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