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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:
  1. Calibration file name.
  2. 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