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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