Given the two stage nature of our track finding algorithm it
is very important that the segment finding be
essentially 100% efficient for high tracks.
While this has been achieved in the offline code by
exhaustive searching in a three-cell mask, the much
simpler and quicker single-cell method finds more than 92%
of the segments from all tracks within the fiducial space
and 85% of all segments in the CTD geometrical acceptance.
It has been shown that the segments found are adequate to
allow a track in the fiducial space to be found 99% of the
time.
In the entire CTD geometrical acceptance a track can be
found 91% of the time in CC events.
At present with only the CTD in the second level track
trigger the largest overall effect on the efficiency for
physics events is geometrical acceptance (strategies to
increase the geometrical acceptance are being studied).
The following remain to be studied with the segment finding in the CTD SLT.