[Halld-tagger] TPOL data

[dugger at jlab.org]

Beni,

The issue about being blind had to do with the data not being written to
the tree.

If I understand the FADC readout correctly, any channel that is above
threshold can not cause an additional trigger. The channels with w_samp1
above the threshold should not be analyzed as though they are possible
"good" events. The statistics would be all messed up.

Take care,
Michael

> Hi All,
> a concern was raised this morning that the long tail of the tpol signals
> could blind the readout.
> this is not the case. If the samples at the beginning of the window are
> above threshold it whole
> wave form is read out. The algorithm on the fpga may evaluate some
> parameters wrong but the
> whole wave from is still there for analysis.
> I scanned through the data to fined instances of a decaying tail with a
> signal on top and could
> not find any for the 75 micron radiator data. I did find an instance
> with the 750 micron radiator.
> see attached plot, but it is very rare.
>
> cheers,
> Beni
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