[Halld-pid] Start Counter issues

[Beni Zihlmann]

Hi All,
attached you find a note I cobbled together looking at the start counter 
data
and made me worry that we are looking at the issue wrong. This may be not
a problem with the path correction but rather a "gain" problem.

I plot the TDC_time minus the RF time VS the signal amplitude. And I do this
for two runs: 73262 (for reference) and a current run 111145.
These plots are generated at three different positions along the z axis at
60cm (middle of the strait section) at 80 cm (bend section) and 92cm
close to the nose (last two plots).

you can (starting from the last plots) that the issue may be the "gain".
in run 73262 the minimum ionizing peak is clearly identified and separated
from the pedestal. This is not so clear for run 111145. Which leads me
to the conclusion that the earlier plots are indicating we cut into the
minimum ionizing peak because the gain is too low.

I will go and look at other runs that are closer to the current run period
with the start counter on. I will also look at what the operating 
voltages are
and if they are truly the same as in the past.

Happy Thanksgiving,
Beni

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