[Clas12_verystrange] FTCal energy corrections

[nicholas]

Dear strangers, 

See below email from Raffaella regarding the energy correction of FTCal. 

Best regards,
-N
> I am covering owl shifts these days and I’m not sure I’ll be able to connect for today meeting. However I can give a brief update via email on the energy calibration of the FTCAL.
> As mentioned before, I think the problem is in the leakage corrections that accounts for the part of the electron energy that is lost, either because the EM shower is not contained in the detector or because of the individual channel thresholds. The leakage corrections were determined from simulations using a fixed energy threshold of 10 MeV.. Analysis of RGA data shows the actual thresholds are significantly higher than that so that the leakage corrections are underestimated. This introduces a bias in the current energy calibration that are forced to reabsorb this offset into the multiplicative factor we use to convert charge to energy. To account for that:
> - I have added a module to the FT calibration suite. To extract the actual threshold per channel;
> - I am running new simulations to re-evaluate the leakage corrections with the actual thresholds.
> Once the second is complete, I’ll redo the energy calibrations and see where we are.
> Let me know if you have any question.
> Best regards,
> 	Raffaella
>