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

[Nathan Baltzell]

Hi Noémie,

Can you explain exactly how you're calculating these numbers for beam charge?  Both the blue and orange numbers.  What exactly do those numbers represent?  If you can also provide the corresponding software that would be great.

-Nathan


> On Sep 30, 2022, at 12:17 PM, pilleux at jlab.org wrote:
> 
> 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.<run_scaler_comparison.png>