[d2n-analysis-talk] S2m Time Average Histogram (From Last Meeting)

[David Flay]

Hi Brad,

We were concerned with why paddle 7 displayed more counts than all the
other paddles when I showed the overlay of each paddle's average time on
the same plot.

It turns out, after looking at my code, that the reason is because paddle
7 had less cuts on it -- paddles 0,...,6,8,...,15 had cuts of the form:

L.s2.lt[i-1]>0&&L.s2.rt[i-1]>0
L.s2.lt[i]>0&&L.s2.rt[i]>0

for i > 7.  For i < 7,


L.s2.lt[i+1]>0&&L.s2.rt[i+1]>0
L.s2.lt[i]>0&&L.s2.rt[i]>0.

Therefore, the way my code was laid out, paddle 7 had:

L.s2.lt[i]>0&&L.s2.rt[i]>0
L.s2.lt[i]>0&&L.s2.rt[i]>0.

Therefore, paddle 7 would always have more entries in its histo.  Attached
is a plot of the overlay of S2m average times for each paddle, with the
condition:

L.s2.lt[i]>0&&L.s2.rt[i]>0 (along with trigger cuts, of course) only.

This plot mimics what we see in the 2D plot of S2m Time Average vs.
track-x.  See the third plot attached -- the TProfile() class wasn't
working as I wanted it to (I was trying to get a profile projected onto
the y-axis), so instead I plotted:

0.5e+09*(L.s2.lt_c[L.s2.t_pads[0]]+L.s2.rt_c[L.s2.t_pads[0]])

as a 1D histogram -- this corresponds to the y-axis of the 2D plot of S2m
Time Average vs. track-x.

Note that the (blue) curve that is out of line with everything else is
paddle #3 in S2m -- I didn't align that one, and it shows up in the place
I expected it to (since it was not aligned).  I'm going to fine-tune some
of these paddles, then start looking at S2m (corrected) vs. S1
(uncorrected).


Dave


-------------------------------------------------
David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
            flay at temple.edu

website: http://www.jlab.org/~flay
              http://quarks.temple.edu
-------------------------------------------------
-------------- next part --------------
A non-text attachment was scrubbed...
Name: s2m_t-avg-overlay-linear_20676_7_6_10.png
Type: image/png
Size: 24397 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/d2n-analysis-talk/attachments/20100706/23596c5a/attachment-0003.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: s2m_t-avg-overlay_20676_7_6_10.png
Type: image/png
Size: 26322 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/d2n-analysis-talk/attachments/20100706/23596c5a/attachment-0004.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: s2m_t-avg-t-pads-arg_20676_7_6_10.png
Type: image/png
Size: 12220 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/d2n-analysis-talk/attachments/20100706/23596c5a/attachment-0005.png