[815] | 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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[1228] | 26 | // $Id: G4ErrorMagFieldLimitProcess.cc,v 1.3 2009/11/11 17:10:33 arce Exp $ |
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[1337] | 27 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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[815] | 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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[1228] | 80 | G4double BPerpMom = BVec.cross( G4ThreeVector(pmag,0.,0.) ).mag() / pmag; |
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[815] | 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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