Here is an update on the wire chamber efficiency for the recent run
12690. There is one canvas for each sector, six columns for the six
superlayers 0 to 5 from left to right, and three rows for layers 0 to 2
from top to bottom. The bins in each histogram are cells in the given
layer. The magenta curve is total hits expected from the tracks, red
are the missed hits, and blue is the resulting efficiency.
This plot can be generated in the blast acct with the following command
after the run has been crunched:
$ wc_eff 12690 -n 250000
The results should be quite independent of tracking, since a miss is
only counted if the track went through the cell, and if there were no
raw hits (CODA) nearby in the same layer, regardless of whether they
made it into the reconstructed track.
The good news is that almost all of the wires are 98-100% efficient.
However there is a box in forward cells 5-9 in the right sector outmost
superlayer which is about 80% efficient. Also a box in the left sector,
middle chamber, and one in the inner chamber (far forward). These two
regions in the left sector affect the same forward tracks, and I worry
this is pushing the partial stub capabilites of reconstruction. As,
well, there are about 7 other very inefficient wires, mostly in the left
sector.
--chris
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