[Rgc_analysis] Run integrated fcup charge reading lower than before in recent runs

[pilleux at jlab.org]

Dear Raffaella, dear Nathan, and dear RGC analysts,

As discussed in previous analysis meetings, I wanted to compare how our
number of events changes in elastic and dvcs data between the low current
and high current configurations.

To that extent, I need to normalize the rates we get, ideally with the
FCup readings. Using the RUN::scaler bank (which uses different scaler
information than the HEL::scaler bank for which Greg showed issues), I
noticed some trend that I don't understand. Please find attached a plot
that shows that for recent runs, the accumulated charge that is registered
(in blue) is lower than before compared to the expected charge (that I
compute from current and run time, in orange).

Some more information to get a headstart on debugging : All these numbers
are DAQ gated so should be independent of beam trips if I understand
correctly. They take into account the fraction of files that were cooked
compared to the number of files in the whole run. I also crosschecked with
Greg's code (thank you!) that we are reading the same values from the
banks.

Am I missing a change that would explain this drop ? Or can this be due to
the calibration of the scaler constants ?

Thank you. Best regards, Noémie.
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