Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/error_propagation/src/G4ErrorMagFieldLimitProcess.cc

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
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 24 // ********************************************************************
 25 //
 26 //
 27 // ------------------------------------------------------------
 28 //      GEANT 4 class implementation file
 29 // ------------------------------------------------------------
 30 //
 31 
 32 #include "G4ErrorMagFieldLimitProcess.hh"
 33 #include "G4ErrorMessenger.hh"
 34 #include "G4TransportationManager.hh"
 35 #include "G4FieldManager.hh"
 36 #include "G4Field.hh"
 37 #include "G4Track.hh"
 38 
 39 #ifdef G4VERBOSE
 40 #  include "G4ErrorPropagatorData.hh"
 41 #endif
 42 
 43 //------------------------------------------------------------------------
 44 G4ErrorMagFieldLimitProcess::G4ErrorMagFieldLimitProcess(
 45   const G4String& processName)
 46   : G4VErrorLimitProcess(processName)
 47 {
 48   theStepLimit = kInfinity;
 49 }
 50 
 51 //------------------------------------------------------------------------
 52 G4ErrorMagFieldLimitProcess::~G4ErrorMagFieldLimitProcess() {}
 53 
 54 //------------------------------------------------------------------------
 55 G4double G4ErrorMagFieldLimitProcess::PostStepGetPhysicalInteractionLength(
 56   const G4Track& aTrack, G4double, G4ForceCondition* condition)
 57 {
 58   *condition           = NotForced;
 59   const G4Field* field = G4TransportationManager::GetTransportationManager()
 60                            ->GetFieldManager()
 61                            ->GetDetectorField();
 62 
 63   theStepLength = kInfinity;
 64   if(field != 0)
 65   {
 66     G4ThreeVector trkPosi = aTrack.GetPosition();
 67     G4double pos1[3];
 68     pos1[0] = trkPosi.x();
 69     pos1[1] = trkPosi.y();
 70     pos1[2] = trkPosi.z();
 71 
 72     G4double h1[3];
 73     field->GetFieldValue(pos1, h1);
 74 
 75     G4ThreeVector BVec(h1[0], h1[1], h1[2]);
 76     G4double pmag     = aTrack.GetMomentum().mag();
 77     G4double BPerpMom = BVec.cross(G4ThreeVector(pmag, 0., 0.)).mag() / pmag;
 78 
 79     theStepLength = theStepLimit * pmag / BPerpMom;
 80 #ifdef G4VERBOSE
 81     if(G4ErrorPropagatorData::verbose() >= 3)
 82     {
 83       G4cout << "G4ErrorMagFieldLimitProcess:: stepLength " << theStepLength
 84              << " B " << BPerpMom << " BVec " << BVec << " pmag " << pmag
 85              << G4endl;
 86     }
 87 #endif
 88   }
 89 
 90   return theStepLength;
 91 }
 92