| Geant4 Cross Reference |
1 // 1
2 // *******************************************
3 // * License and Disclaimer
4 // *
5 // * The Geant4 software is copyright of th
6 // * the Geant4 Collaboration. It is provided
7 // * conditions of the Geant4 Software License
8 // * LICENSE and available at http://cern.ch/
9 // * include a list of copyright holders.
10 // *
11 // * Neither the authors of this software syst
12 // * institutes,nor the agencies providing fin
13 // * work make any representation or warran
14 // * regarding this software system or assum
15 // * use. Please see the license in the file
16 // * for the full disclaimer and the limitatio
17 // *
18 // * This code implementation is the result
19 // * technical work of the GEANT4 collaboratio
20 // * By using, copying, modifying or distri
21 // * any work based on the software) you ag
22 // * use in resulting scientific publicati
23 // * acceptance of all terms of the Geant4 Sof
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::G4ErrorMagFieldLi
45 const G4String& processName)
46 : G4VErrorLimitProcess(processName)
47 {
48 theStepLimit = kInfinity;
49 }
50
51 //--------------------------------------------
52 G4ErrorMagFieldLimitProcess::~G4ErrorMagFieldL
53
54 //--------------------------------------------
55 G4double G4ErrorMagFieldLimitProcess::PostStep
56 const G4Track& aTrack, G4double, G4ForceCond
57 {
58 *condition = NotForced;
59 const G4Field* field = G4TransportationManag
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().m
77 G4double BPerpMom = BVec.cross(G4ThreeVect
78
79 theStepLength = theStepLimit * pmag / BPer
80 #ifdef G4VERBOSE
81 if(G4ErrorPropagatorData::verbose() >= 3)
82 {
83 G4cout << "G4ErrorMagFieldLimitProcess::
84 << " B " << BPerpMom << " BVec "
85 << G4endl;
86 }
87 #endif
88 }
89
90 return theStepLength;
91 }
92