[Clas12_calcom] [EXTERNAL] Re: timelines for RGB Spring19 available to be checked

[L Smith]

Hi Silvia,

The gain change at 6546 was a mistake and overwrote the RGB gain constants from 6546+ using the final update constants for RGA-S19.  Actually this calibration is better even when applied retroactively to RGB (pizero invariant mass plots are closer to nominal mass) and also compensates for the gain time dependence seen in RGB, but I was already satisfied with the nominal RGB calibration and was not intending to compensate for gain drift.  So I corrected the faulty table and this issue should go away automatically.  BTW, I have updated the SF EB parameterization to track the SF for the current RGB calibration.

The nominal calibration for RGB was not completed until Feb 6 and so was missed by the 28.44 timestamp (the result can be seen in the v28.46 nodenoise mini-timeline).  The 2% e- loss overall was expected since the pion-based gain calibrations shift the gains slightly downward, and some e- at the fiducial edges are lost to the chi2pid cut.  We saw the same effect in RGA-S19. 

Regards,
Cole

> On Apr 5, 2023, at 5:39 AM, silvia--- via Clas12_calcom <clas12_calcom at jlab.org> wrote:
> 
> Dear detector experts,
> new timelines were made for RGB Spring19 (data cooked with 8.7.0), and can
> be found at this link:
> https://clas12mon.jlab.org/rgb/pass0/v28.50/tlsummary/
> Please check them and let me know if you see any problems.
> I gave a quick look and compared to timeline v28.44 (February 6th, CJ
> 8.5.0), and I show comparisons in the slides you can find here:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__box.in2p3.fr_index.php_s_MT3acjKRMgp2PN4&d=DwIFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=qEkdYeiAbIsODpxTO59E_ab70KWmehf8Tr3XybSYmSs&m=w-X9JNCeuAUF6UC_9ctEGh7wtYEfNxBkK2q69u828kYlHyjWsuH96fkwK8LG5G5V&s=IwOVb0XzPJnqo0edPwbajG0C8L8fyykh_pHzU8eRRQ8&e= 
> In summary:
> - I notice a ~2% reduction in electrons/trigger yield;
> - ECAL: there is a jump in the SF at run 6546 (gains changed in CCDB on
> March 4th for 6546 - 7000); pi0 mass is out of specs for runs 6437 - 6545;
> pi+time - starttime is out of specs/at the edge of specs for most of the
> run range;
> - slight worsening in DC residuals
> - FTCal: less outliers in pi0 mass, although a few just remain. It may be
> just a statistical effect, though.
> - FTOF p1b pathlength-corrected edep has changed (this was expected) and
> specs have changed as well.
> For the rest, all seemed stable to me.
> Please give me your feedback.
> Cole, if you need the pass0 data to complete ECAL calibration, you'll find
> them at: /volatile/clas12/rg-b/production/recon/pass0/v28.50/mon/recon/
> Thanks a lot and best regards,
> Silvia
> 
> 
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