| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | // $Id: G4ErrorMagFieldLimitProcess.cc,v 1.2 2007/05/29 14:41:35 gcosmo Exp $
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| 27 | // GEANT4 tag $Name: $
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| 28 | //
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| 29 | // ------------------------------------------------------------
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| 30 | // GEANT 4 class implementation file
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| 31 | // ------------------------------------------------------------
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| 32 | //
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| 33 |
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| 34 | #include "G4ErrorMagFieldLimitProcess.hh"
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| 35 | #include "G4ErrorMessenger.hh"
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| 36 | #include "G4TransportationManager.hh"
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| 37 | #include "G4FieldManager.hh"
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| 38 | #include "G4Field.hh"
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| 39 | #include "G4Track.hh"
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| 40 |
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| 41 | #ifdef G4VERBOSE
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| 42 | #include "G4ErrorPropagatorData.hh"
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| 43 | #endif
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| 44 |
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| 45 | //------------------------------------------------------------------------
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| 46 | G4ErrorMagFieldLimitProcess::
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| 47 | G4ErrorMagFieldLimitProcess(const G4String& processName)
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| 48 | : G4VErrorLimitProcess(processName)
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| 49 | {
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| 50 | theStepLimit = kInfinity;
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| 51 | }
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| 52 |
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| 53 |
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| 54 | //------------------------------------------------------------------------
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| 55 | G4ErrorMagFieldLimitProcess::~G4ErrorMagFieldLimitProcess()
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| 56 | { }
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| 57 |
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| 58 |
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| 59 | //------------------------------------------------------------------------
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| 60 | G4double G4ErrorMagFieldLimitProcess::
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| 61 | PostStepGetPhysicalInteractionLength( const G4Track& aTrack, G4double ,
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| 62 | G4ForceCondition* condition )
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| 63 | {
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| 64 | *condition = NotForced;
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| 65 | const G4Field* field =
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| 66 | G4TransportationManager::GetTransportationManager()->GetFieldManager()
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| 67 | ->GetDetectorField();
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| 68 |
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| 69 | theStepLength = kInfinity;
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| 70 | if( field != 0 ) {
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| 71 | G4ThreeVector trkPosi = aTrack.GetPosition();
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| 72 | G4double pos1[3];
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| 73 | pos1[0] = trkPosi.x(); pos1[1] = trkPosi.y(); pos1[2] = trkPosi.z();
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| 74 |
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| 75 | G4double h1[3];
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| 76 | field->GetFieldValue( pos1, h1 );
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| 77 |
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| 78 | G4ThreeVector BVec(h1[0],h1[1],h1[2]);
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| 79 | G4double pmag = aTrack.GetMomentum().mag();
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| 80 | G4double BPerpMom = BVec.cross( pmag ).mag() / pmag;
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| 81 |
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| 82 | theStepLength = theStepLimit * pmag / BPerpMom;
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| 83 | #ifdef G4VERBOSE
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| 84 | if(G4ErrorPropagatorData::verbose() >= 3 ) {
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| 85 | G4cout << "G4ErrorMagFieldLimitProcess:: stepLength "
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| 86 | << theStepLength << " B " << BPerpMom << " BVec " << BVec
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| 87 | << " pmag " << pmag << G4endl;
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| 88 | }
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| 89 | #endif
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| 90 | }
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| 91 |
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| 92 | return theStepLength;
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| 93 | }
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