[G12] CC time vs SC time question

[s.schadmand]

my guess is that these are the absolute times and only the magnitude of the difference in ns needs to make sense. who has a smaller absolute time entry depends on cable lengths and readout, common start/stop or clocking?



> On Jul 14, 2015, at 07:25, Michael C. Kunkel <mkunkel at jlab.org> wrote:
>
> Greetings,
>
> Michaela Schever, Masters student at Forschungszentrum Jülich working with g12, has asked me a question that puzzles me.
>
> Please look at
> https://clasweb.jlab.org/rungroups/g12/wiki/index.php/CC_Study#Tuesday_July_14.2C_2015
>
> Notice the y axis is the cc_time and the x axis is the sc_time.
> The question was why is the cc time greater than that of the sc time, considering the TOF is located after the CC and also why the negative slope?
>
> I did look in the code and noticed that these quantities are grabbed from the TBID bank, which has both cc and sc time in ns.
> I also looked into some of the calibrations and did not see anything striking that would answer this.
>
> Please help us understand this.
>
> BR
> MK
> ----------------------------------------
> Michael C. Kunkel, PhD
> Forschungszentrum Jülich
> Nuclear Physics Institute and Juelich Center for Hadron Physics
> Experimental Hadron Structure (IKP-1)
> www.fz-juelich.de/ikp
>
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