Muon Slides 19-September-2001
- I am still working on the digitization.
- See last week's report for
some BSU efficiency studies.
- I have had some problems running long tape jobs. Thus my statistics
are not what I'd like. However:
- I looked at BSU occupancies. The x axis
is the stack number, which ranges from 0 to 147. There is a gap where
the toroid supports preclude coverage. One CCU is not working in the
West. There is considerable variation from scintillator to scintillator,
which may require re-plateauing.
- I looked at the
t0 of 4-hit BMU stubs and the hit (no timing cuts) in
either BSU paddle above the stack. We can easily see early tracks coming from
the beam and tracks from interaction, in 4 different bunch crossings.
The agreement of the track t0 with the BSU time is good. Inefficiencies
seem to be spread across BSU's and don't come from a few inefficient paddles.
- The low statistics cripple looking for the J/Psi's, but
since we are finally pushed forward I
thought I should try. Both plots are of dimuons with at least one
CdfMuon being a BMU. The lower one requires a BSU hit going along with
the BMU stub. Plots deleted until I fix them. I didn't have enough
BSU matches thanks to a bug
- The West TSU TDC was not installed, so this set
of plots shows only the East side. Aside from 2 oscillations, it
looks like the paddle-to-paddle variation is smaller than with the BSU,
though still not perfect. The raw times show a reasonable structure, with
a little oscillation peak at early times. The pulse widths look sensible
as well. I include a magnified portion of the peak showing the
difference between 4-hit stub t0 and the BSU hit time. The FWHM is about
20 nsec, which corresponds to a sigma of about 8.5 nsec in variation
between the times.
- I plot both west and east on the same plot, so the stack numbers
for BMU go from 0 to 575: 0-287 for the West and 288-575 for the East.
These plots compare raw hits to tracks.
The BMU raw hit plot looks similar to the BMU stub plot, except for a
noisy TDC channel. Likewise the raw BSU plot looks similar to that of
stubs which match a BSU. The dips in the distribution around paddle 30
(a West one) and 170 (East paddle number about 35) correspond to dips
in the BMU track distribution, and probably do not represent BSU
- The bench numbers for the time division differ somewhat from those
I infer from the data. Two cells in each stack are ganged together with
the corresponding cell in a neighboring stack. The ganging is done at the
front, so a hit at the front will arrive at both preamps at about the same
time. A hit at the rear will immediately arrive at one preamp but take
an additional 26 nsec to reach the neighbor. If the rear scintillator is
hit the result looks like the upper plot and if
the front is hit it looks like the lower plot. Note the arrows indicating
the front and rear of the chambers.
If both scintillators are hit I flag only the first, so the plot using front
scintillators may be contaminated.
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