In the 36x36 running we only had the East side instrumented.
For reasons not altogether clear the toroids were not
pushed forward into position, so it is useless to look for tracks
in the COT to link to the muon stubs. Of course, we also have no
BSU or TSU scintillators in the readout, so the BMU has to stand
uncross-checked in splendid isolation.
One thing I can assert is that there appears to be a problem,
since essentially all the tracks come from a single stack. I
will assume that this is a bug in the stub-finding code, and proceed
accordingly.
- Running on 36x36 data from run 11BB4E I have plots
of The would-be-trigger distribution,
the drift distribution, number of hits/cell and stack (after
cuts on hot cells). I also have plots of
the cell occupancy, the width distribution, reconstructed Z, and
drift+width. In 5866 events we find 397 stubs reconstructed
with essentially no cuts on quality,
and 868 cosmic candidates--most of which are also not useful.
- Run 1BB4D has 5891 events, and the corresponding plots of
drifts etc are here and for the
widths etc are here.
- Run 1BB4F has about 26 events.
- Run 1BB50 has 5923 events.and the corresponding plots of
drifts etc are here and for the
widths etc are here.
- I ran numerous times on run 1BB4D, varying the t0. Here find the
resulting plots of the number of IMUS tracks found and the
average t0. I followed up on this with cuts on
the impact parameter (how close the stub points to the beamline). I
expect that some (possibly most) of the stubs will come from interactions
in the magnets. Cuts of
100 cm,
80 cm,
60 cm,
40 cm,
20 cm, and
10 cm are here. Notice that the dip in
the chi-squared plot for 4-hit tracks doesn't move significantly.
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