[Halld-cal] Fwd: mailing list, fits, linearity of gain

[serguei at jlab.org]

---------------------------- Original Message ----------------------------
Subject: Fwd: mailing list, fits, linearity of gain
From:    sergey.kuleshov at usm.cl
Date:    Mon, January 30, 2012 5:36 pm
To:      serguei at jlab.org
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----- Forwarded message from hayk.hakobyan at usm.cl -----
     Date: Mon, 30 Jan 2012 14:50:30 -0300
     From: hayk.hakobyan at usm.cl
  Subject: mailing list, fits, linearity of gain
       To: sergey.kuleshov at usm.cl

To: halld-cal at jlab.org


Dear Elton and All,

I'm trying to join to the hall D calorimeter mailing list using the
following link:
https://halldweb1.jlab.org/wiki/index.php/Jan_24,_2012_Readout#Minutes
but it looks it doesn't work for me. Could you please add me to the
mailing list?

I've also located a file with fits for all 16 cells of MPPC number 90
with measurements done in different 10 voltages from Stage 3 on JLab
computers here:
/scratch/hayk/gaussian_fit_MPPC_90.root
(please access to the file from jlabl1, ifarml64 recently acts
strangely for many jlab accounts).

As well as I attach to the email files with the study of the MPPC
signal linearity (for MPPC numbers 90 and 62). The first column
corresponds to the MPPC number; the second - MPPC cell number; the
third to the voltage; the forth - the number of channels between
pedestal and 1 photo-electron peak; the fifth - the number of channels
  between 1 photo-electron peak and 2 photo-electron peak; the sixth -
  the number of channels between 2 photo-electron peak and 3
photo-electron peak. So one can conclude that the signals are pretty
linear. The results are similar for other MPPCs as well. (If the gain
is zero that means that 3 photo-electron peak is very insignificant so
  we can't calculate gain for that case.)

Please feel free to let me know if you have any questions.

Thanks,
Hayk.


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