[Halld-tagger] Microscope beam test (part 2)

[Alexander Somov]

Hi,

I put a few plots showing time correlations between
the trigger/(accelerator RF) and the SiPM channels
(run 190) to www.jlab.org/~somov/micro

sc_res.pdf :  trigger scintillator time - bunch time
               determined using the accelerator RF pulses


dt_sum.pdf :  time difference between 3 SiPM sums
               and the trigger as a function of the
               maximum FADC amplitude.


Description: for each trigger, we determine the bunch time,
   denoted as t_rf in the plot, and plot the difference
   t_rf - t_sipm. Note, the constant time delay (due to cables,
   etc)  between the trigger and the SiPM signal is not subtracted
   in these plots.


dt_sum1.pdf : time resolution as a function of the maximum
               FADC amplitude (after applying  kind of a 'time-walk'
               correction)


Note, I have not calibrated SiPM amplitudes, that's why I
simply use the maximum FADC amplitude.


Cheers,
        Sascha