source: trunk/source/error_propagation/src/G4ErrorSurfaceTrajState.cc @ 850

Last change on this file since 850 was 850, checked in by garnier, 16 years ago

geant4.8.2 beta
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26// $Id: G4ErrorSurfaceTrajState.cc,v 1.6 2007/06/21 15:04:08 gunter Exp $
27// GEANT4 tag $Name: HEAD $
28//
29// ------------------------------------------------------------
30//      GEANT 4 class implementation file
31// ------------------------------------------------------------
32//
33
34#include "G4ErrorSurfaceTrajState.hh"
35#include "G4ErrorPropagatorData.hh"
36
37#include "G4Field.hh"
38#include "G4FieldManager.hh"
39#include "G4TransportationManager.hh"
40
41#include "G4ErrorMatrix.hh"
42
43#include <iomanip>
44
45
46//------------------------------------------------------------------------
47G4ErrorSurfaceTrajState::
48G4ErrorSurfaceTrajState( const G4String& partType, const G4Point3D& pos,
49                         const G4Vector3D& mom, const G4Vector3D& vecU,
50                         const G4Vector3D& vecV, const G4ErrorTrajErr& errmat)
51  : G4ErrorTrajState( partType, pos, mom, errmat )
52{
53  Init();
54  fTrajParam = G4ErrorSurfaceTrajParam( pos, mom, vecU, vecV );
55}
56
57
58//------------------------------------------------------------------------
59G4ErrorSurfaceTrajState::
60G4ErrorSurfaceTrajState( const G4String& partType, const G4Point3D& pos,
61                         const G4Vector3D& mom, const G4Plane3D& plane,
62                         const G4ErrorTrajErr& errmat )
63  : G4ErrorTrajState( partType, pos, mom, errmat )
64{
65  Init();
66  fTrajParam = G4ErrorSurfaceTrajParam( pos, mom, plane );
67
68}
69
70
71//------------------------------------------------------------------------
72G4ErrorSurfaceTrajState::
73G4ErrorSurfaceTrajState( G4ErrorFreeTrajState& tpSC, const G4Plane3D& plane )
74  : G4ErrorTrajState( tpSC.GetParticleType(), tpSC.GetPosition(),
75                      tpSC.GetMomentum() )
76{
77  //  fParticleType = tpSC.GetParticleType();
78  //  fPosition = tpSC.GetPosition();
79  //  fMomentum = tpSC.GetMomentum();
80  fTrajParam = G4ErrorSurfaceTrajParam( fPosition, fMomentum, plane );
81  Init();
82
83  //----- Get the error matrix in SC coordinates
84  BuildErrorMatrix( tpSC, GetVectorV(), GetVectorW() );
85}
86
87
88//------------------------------------------------------------------------
89G4ErrorSurfaceTrajState::
90G4ErrorSurfaceTrajState( G4ErrorFreeTrajState& tpSC, const G4Vector3D& vecU,
91                         const G4Vector3D& vecV )
92  : G4ErrorTrajState( tpSC.GetParticleType(), tpSC.GetPosition(),
93                      tpSC.GetMomentum() )
94{
95  fTrajParam = G4ErrorSurfaceTrajParam( fPosition, fMomentum, vecU, vecV );
96  theTSType = G4eTS_OS;
97  //----- Get the error matrix in SC coordinates
98  BuildErrorMatrix( tpSC, vecU, vecV );
99}
100
101
102//------------------------------------------------------------------------
103void G4ErrorSurfaceTrajState::
104BuildErrorMatrix( G4ErrorFreeTrajState& tpSC, const G4Vector3D&,
105                  const G4Vector3D& )
106{
107  G4double sclambda = tpSC.GetParameters().GetLambda();
108  G4double scphi = tpSC.GetParameters().GetPhi();
109  if( G4ErrorPropagatorData::GetErrorPropagatorData()->GetMode() == G4ErrorMode_PropBackwards ){
110    sclambda *= -1;
111    scphi += CLHEP::pi;
112  }
113  G4double cosLambda = std::cos( sclambda );
114  G4double sinLambda = std::sin( sclambda );
115  G4double sinPhi = std::sin( scphi );
116  G4double cosPhi = std::cos( scphi );
117
118#ifdef G4EVERBOSE
119  if( iverbose >= 4) G4cout << " PM " << fMomentum.mag() << " pLambda " << sclambda << " pPhi " << scphi << G4endl;
120#endif
121
122  G4ThreeVector vTN( cosLambda*cosPhi, cosLambda*sinPhi,sinLambda );
123  G4ThreeVector vUN( -sinPhi, cosPhi, 0. );
124  G4ThreeVector vVN( -vTN.z()*vUN.y(),vTN.z()*vUN.x(), cosLambda );
125 
126#ifdef G4EVERBOSE
127  if( iverbose >= 4) G4cout << " SC2SD: vTN " << vTN << " vUN " << vUN << " vVN " << vVN << G4endl;
128#endif
129  G4double UJ = vUN*GetVectorV();
130  G4double UK = vUN*GetVectorW();
131  G4double VJ = vVN*GetVectorV();
132  G4double VK = vVN*GetVectorW();
133
134
135  //--- Get transformation first
136  G4ErrorMatrix transfM(5, 5, 0 );
137  //--- Get magnetic field
138  const G4Field* field = G4TransportationManager::GetTransportationManager()->GetFieldManager()->GetDetectorField();
139
140  G4Vector3D vectorU = GetVectorV().cross( GetVectorW() );
141
142#ifdef G4EVERBOSE
143  if( iverbose >= 4) G4cout << "vectors " << vectorU << " " <<  GetVectorV() << " " << GetVectorW() << G4endl;
144#endif
145  G4double T1R = 1. / ( vTN * vectorU );
146
147  if( fCharge != 0 && field ) {
148    G4double pos[3]; pos[0] = fPosition.x()*cm; pos[1] = fPosition.y()*cm; pos[2] = fPosition.z()*cm;
149    G4double Hd[3];
150    field->GetFieldValue( pos, Hd );
151    G4ThreeVector H = G4ThreeVector( Hd[0], Hd[1], Hd[2] ) / tesla *10.;  //in kilogauus
152    G4double magH = H.mag();
153    G4double invP = 1./(fMomentum.mag()/GeV);
154    G4double magHM = magH * invP;
155    if( magH != 0. ) {
156      G4double magHM2 = fCharge / magH;
157      G4double Q = -magHM * c_light/ (km/ns);
158#ifdef G4EVERBOSE
159      if( iverbose >= 4) G4cout << GeV <<  " Q " << Q << " magHM " << magHM << " c_light/(km/ns) " << c_light/(km/ns) << G4endl;     
160#endif
161
162      G4double sinz = -H*vUN * magHM2;
163      G4double cosz =  H*vVN * magHM2;
164      G4double T3R = Q * std::pow(T1R,3);
165      G4double UI = vUN * vectorU;
166      G4double VI = vVN * vectorU;
167#ifdef G4EVERBOSE
168      if( iverbose >= 4) {
169        G4cout << " T1R " << T1R << " T3R " << T3R << G4endl;
170        G4cout << " UI " << UI << " VI " << VI << " vectorU " << vectorU << G4endl;
171        G4cout << " UJ " << UJ << " VJ " << VJ << G4endl;
172        G4cout << " UK " << UK << " VK " << VK << G4endl;
173      }
174#endif
175
176      transfM[1][3] = -UI*( VK*cosz-UK*sinz)*T3R;
177      transfM[1][4] = -VI*( VK*cosz-UK*sinz)*T3R;
178      transfM[2][3] = UI*( VJ*cosz-UJ*sinz)*T3R;
179      transfM[2][4] = VI*( VJ*cosz-UJ*sinz)*T3R;
180    }
181  }
182
183  G4double T2R = T1R * T1R;
184  transfM[0][0] = 1.;
185  transfM[1][1] = -UK*T2R;
186  transfM[1][2] = VK*cosLambda*T2R;
187  transfM[2][1] = UJ*T2R;
188  transfM[2][2] = -VJ*cosLambda*T2R;
189  transfM[3][3] = VK*T1R;
190  transfM[3][4] = -UK*T1R;
191  transfM[4][3] = -VJ*T1R;
192  transfM[4][4] = UJ*T1R;
193
194#ifdef G4EVERBOSE
195  if( iverbose >= 4) G4cout << " SC2SD transf matrix A= " << transfM << G4endl;
196#endif
197  fError = G4ErrorTrajErr( tpSC.GetError().similarity( transfM ) );
198
199#ifdef G4EVERBOSE
200  if( iverbose >= 1) G4cout << "G4EP: error matrix SC2SD " << fError << G4endl;
201  if( iverbose >= 4) G4cout << "G4ErrorSurfaceTrajState from SC " << *this << G4endl;
202#endif
203
204}
205
206
207//------------------------------------------------------------------------
208void G4ErrorSurfaceTrajState::Init()
209{
210 theTSType = G4eTS_OS;
211 BuildCharge();
212}
213
214
215//------------------------------------------------------------------------
216void G4ErrorSurfaceTrajState::Dump( std::ostream& out ) const
217{
218  out << *this;
219}
220
221
222//------------------------------------------------------------------------
223std::ostream& operator<<(std::ostream& out, const G4ErrorSurfaceTrajState& ts)
224{
225  out.setf(std::ios::fixed,std::ios::floatfield);
226 
227  ts.DumpPosMomError( out );
228 
229  out << " G4ErrorSurfaceTrajState: Params: " << ts.fTrajParam << G4endl;
230  return out;
231}
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