Par01/src/Par01PiModel.cc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 /// \file Par01/src/Par01PiModel.cc
0027 /// \brief Implementation of the Par01PiModel class
0028 //
0029 //
0030 //
0031 #include "Par01PiModel.hh"
0032
0033 #include "G4Gamma.hh"
0034 #include "G4PionMinus.hh"
0035 #include "G4PionPlus.hh"
0036
0037 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0038
0039 Par01PiModel::Par01PiModel(G4Region* anEnvelope)
0040   : G4VFastSimulationModel("Par01PiModel", anEnvelope)
0041 {
0042   ;
0043 }
0044
0045 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0046
0047 Par01PiModel::~Par01PiModel()
0048 {
0049   ;
0050 }
0051
0052 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0053
0054 G4bool Par01PiModel::IsApplicable(const G4ParticleDefinition& particleType)
0055 {
0056   return &particleType == G4PionMinus::PionMinusDefinition()
0057          || &particleType == G4PionPlus::PionPlusDefinition();
0058 }
0059
0060 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0061
0062 G4bool Par01PiModel::ModelTrigger(const G4FastTrack& fastTrack)
0063 {
0064   //-------------------------------------------------------------
0065   // UserTrigger() method: method which has to decide if
0066   // the parameterisation has to be applied.
0067   // Here ModelTrigger() asks the user (ie you) a 0/1 answer.
0068   //
0069   // Note that quantities like the local/global position/direction etc..
0070   // are available at this level via the fastTrack parameter (allowing
0071   // to check distance from boundaries, see below  to allow the decision)
0072   //--------------------------------------------------------------
0073   G4cout << "\nPar01PiModel::ModelTrigger() called:" << G4endl;
0074   G4cout << "--------------------------------" << G4endl;
0075   G4cout << "(particle is a " << fastTrack.GetPrimaryTrack()->GetDefinition()->GetParticleName()
0076          << " )\n"
0077          << G4endl;
0078
0079   // -- Examples of available informations:
0080
0081   // -- position:
0082   G4cout << "         Track position: " << fastTrack.GetPrimaryTrack()->GetPosition()
0083          << "(global coord.)" << fastTrack.GetPrimaryTrackLocalPosition() << "(in envelope coord.)"
0084          << G4endl;
0085
0086   // -- direction:
0087   G4cout << "         Track direction:" << fastTrack.GetPrimaryTrack()->GetMomentum().unit()
0088          << "(global coord.)" << fastTrack.GetPrimaryTrackLocalDirection() << "(in envelope coord.)"
0089          << G4endl;
0090
0091   return true;
0092 }
0093
0094 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0095
0096 void Par01PiModel::DoIt(const G4FastTrack& fastTrack, G4FastStep& fastStep)
0097 //--------------------------------------------------------
0098 //
0099 // User method to code the parameterisation properly said.
0100 //
0101 //--------------------------------------------------------
0102 {
0103   //------------------------------------------------
0104   // The primary track continues along its direction.
0105   // One secondary (a photon) is added:
0106   //------------------------------------------------
0107   G4cout << "      Pion `model' applied\n" << G4endl;
0108
0109   //------------------------------
0110   // Primary:
0111   //    idem as in "DefaultModel":
0112   //
0113   //------------------------------
0114   G4ThreeVector position;
0115   G4double distance;
0116   distance = fastTrack.GetEnvelopeSolid()->DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
0117                                                          fastTrack.GetPrimaryTrackLocalDirection());
0118   position =
0119     fastTrack.GetPrimaryTrackLocalPosition() + distance * fastTrack.GetPrimaryTrackLocalDirection();
0120
0121   // -- set final position:
0122   fastStep.ProposePrimaryTrackFinalPosition(position);
0123
0124   //---------------------------
0125   // Secondary:
0126   //   Adds one "secondary":
0127   //---------------------------
0128   // -- First, user has to say how many secondaries will be created:
0129   fastStep.SetNumberOfSecondaryTracks(1);
0130
0131   //------------------------
0132   // -- Build the secondary:
0133   //------------------------
0134   // -- direction:
0135   G4ParticleMomentum direction(fastTrack.GetPrimaryTrackLocalDirection());
0136   direction.setZ(direction.z() * 0.5);
0137   direction.setY(direction.y() + direction.z() * 0.1);
0138   direction = direction.unit();  // necessary ?
0139
0140   // -- dynamics (Note that many constructors exists for G4DynamicParticle
0141   // -- see prototype/particle+matter/particles/management/include/G4DynamicParticle.hh)
0142   G4DynamicParticle dynamique(G4Gamma::GammaDefinition(), direction,
0143                               fastTrack.GetPrimaryTrack()->GetKineticEnergy() / 2.);
0144   // -- position:
0145   G4double Dist;
0146   Dist = fastTrack.GetEnvelopeSolid()->DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
0147                                                      direction);
0148   G4ThreeVector posi;
0149   posi = fastTrack.GetPrimaryTrackLocalPosition() + Dist * direction;
0150
0151   //------------------------------------
0152   //-- Creation of the secondary Track:
0153   //------------------------------------
0154   fastStep.CreateSecondaryTrack(dynamique, posi, fastTrack.GetPrimaryTrack()->GetGlobalTime());
0155 }