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Tracking and Hit Finding
Draft Documentation for Cosmic-Ray Test Tracking
In order to run tracking on cosmic-ray test data, the raw data has to be
pedestal subtracted, gain corrected and the hits have to be reconstructed.
An executable that can be used to perform all these tasks and then to run
tracking is in:
~staronl/Staf/bin/irix/trkStaf (for irix)
~staronl/Staf/bin/sun4os5/trkStaf (for solaris)
Kumacs to run the reconstruction are in:
~staronl/Staf/wrk/trk
- trk_init.kumac
- Initializes hit finding and tracking. Its two
arguments are:
- Calibration file name.
- Data file name.
- trk_run.kumac
- Runs hit finding and tracking.
- trk_plot.kumac
- Plots results.
The tracking needs the following input tables:
- tpt_spars
- parameters for the tracking
- tcl_tphit
- reconstructed hits
- tpg_detector
- information about the sector geometry
It also produces the following output tables:
- tcl_tphit
- reconstructed hits (information about assignment to tracks
is updated)
- tpt_res
- table with residuals
- tpt_strack
- reconstructed track parameters
The tables that belong to the tracking module contain:
- tpt_spars
- Tracking parameters
- nskip
- number of points to skip from the fit
- skip[45]
- list of rownumbers where to skip them
- hole
- acceptable number of missing points (in a row)
- nmin
- minimum number of points on a track
- oy
- cut for outliers in the pad plane (residual squared)
- oz
- cut for outliers in the drift direction (residual squared)
- tpt_strack
- Parameters of the reconstructed tracks
- trk
- track number
- npnt
- number of points assigned to a track
- ay
- slope parameter in the x-y plane
- by
- offset parameter in the x-y plane
- az
- slope parameter in the x-z plane
- bz
- offset parameter in the x-z plane
- tpt_res
- Residuals for the reconstructed tracks
- trk
- track number
- hit
- hit number
- resy
- distance between the hit and the trk track in
the x-y plane
- resz
- distance between the hit and the trk track in
the x-z plane
Written: Iwona Sakrejda, 19-NOV-1996
Modified: Iwona Sakrejda, 10-DEC-1996
Page maintenance:
Roy Bossingham, LBNL
RRBossingham@lbl.gov