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1 This is an example illustrating the use of the error propagation utility.
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3 A G4ErrorFreeTrajState is created to simulate a muon track of 20 GeV along the X axis. Then the track is propagated until the target is reached.
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5 The geometry is a simplified typical HEP detector:
6 An air beamline ( BEAM )
7 An air central detector ( CDET )
8 A copper calorimeter, divided in four ( ECAL )
9 An aluminium calorimeter, divided in ten ( HCAL )
10 An air muon detector ( MUON )
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12 It is inmersed in a magnetic field along the Z axis with default value -1 kilogauss. This value can be changed with the command "/exerror/setField.
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15 The type of target can be chosen with the enviromental variable G4ERROR_TARGET:
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17 PLANE_SURFACE : use a G4ErrorPlaneSurfaceTarget perpendicular to X at (2241. mm, 0, 0)
18 CYL_SURFACE : use a G4ErrorCylSurfaceTarget parallel to Z of radius 2220 mm
19 VOLUME : use a G4ErrorGeomVolumeTarget with volume name "MUON"
20 TRKLEN : use a G4ErrorTrackLengthTarget with track length 2230 mm
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23 The user may also choose if the propagation is done forwards (the natural way, loosing energy) or backwards (in opposite direction, gaining energy), with the enviromental variable G4ERROR_MODE:
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25 FORWARDS : propagate in the forward direction
26 BACKWARDS : propagate in the backward direction
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29 There are also two modes of propagation, that can be chosen with the enviromental variable G4ERROR_PROP
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31 UNTIL_TARGET : propagate until target, all steps in one go
32 STEP_BY_STEP propagate until target, returning control to the user at each step
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