[d2n-analysis-talk] S2m Right TDCs

[Brad Sawatzky]

On Mon, 06 Dec 2010, David Flay wrote:

> Attached is a few plots taking a closer look at the spike at ~ 170 ns
> in the S2m R-TDC times.
> 
> The first plot shows an overlay of the ADC for PMT 7 with one-track,
> dead time pulse removed, PMT 7 firing (TDC >0) and a T3 cut (black
> line), with the plot having the same cuts plus a cut on the TDC time ~
> 170ns (red line).  The blue line includes a cut > 0 on the ADC.
> 
> The second plot shows the 'inverse' of the first -- TDC for PMT 7 with
> the same cuts, (black) along with a cut > 550 in the raw ADC (red).
> 
> This shows where the spike in the S2m TDC times comes from --
> (largely) the spike at zero in the ADC.

OK, I think that makes sense then.  "Hits" with 1e+09*L.s2.rt_c[] > 150
aren't really hits at all -- keep that in mind when generating plots or
computing values that depend on this variable.

-- Brad

-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
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