[Clas12_rgb] timelines of v15 available online - and cooking plan for DNP

[Daniel Carman]

Silvia,

I spent some time this morning going over the timelines for RG-B from the v15 pass-0 for both
FTOF and CTOF.

I think CTOF is reasonable over the full RG-B run range. There are a few discrete shifts in timing,
but they are quite small.

The bigger issue is the stability of the FTOF calibration. Calibrating the 3 reference runs for RG-B,
6164, 6233, and 6489 was not enough to ensure stable calibrations throughout the full run range. From
the standpoint of FTOF calibrations, there are 3 run ranges where the calibrations are in decent shape.
1) 6156 - 6170
2) 6233 - 6349
3) 6420 - 6525
If you stay in these ranges for the RG-B DNP cooking, you should be in reasonable shape. I believe that
there are still some questions about what is being plotted in the timelines. I still believe that the timeline
quantities do not fully match what I am using for calibration in the suite. However, I am reasonably
confident in my assessments for the above 3 run ranges.

Let me know if you have any questions.

Regards,
Daniel

On Sep 10, 2019, at 7:24 AM, Silvia Niccolai <silvia at jlab.org<mailto:silvia at jlab.org>> wrote:

Dear all,
thanks to Zhiwen, Yordanka, and Sangbaek, we have now timelines online for the pass0/v15 cooking (ten files/run). The link is:
https://clas12mon.jlab.org/rgb/pass0/v15/tlsummary/
I encourage all detector-responsible people to please give a look at them.

Keep in mind that the latest FT calibrations from Raffaella were not yet included in this cooking pass.

We have spotted a problem in CND calibration, that has already been fixed, constants re-uploaded in ccdb.

There are still some problems in the rftime electron mean distribution:
1) the runs 6189-6222 and 6351-6399 show that weird "sector dependence" we had previously observed. I am not sure if the cause of this was ever full understood. The effect is not so big, as the maximum shift is below 100 ps, but still, for now I prefer to exclude these two run ranges from the cooking for DNP.
2) there is a 25-ps "step" between the first set of runs and run 6329, then it goes back down for 6346, to finally go permanently back up by 25 ps from 6420 onwards.
3) the last set of runs (6546 onward) seem to show again some sector dependence, albeit even smaller than for the two other sets of runs.
Raffaella and/or Daniel, do you have any suggestions/ideas? I think that on the RF calibration side all should be ok now, so maybe the problem is at the level of ftof?

I have prepared, and sent to Zhiwen, a run list for DNP including only "stable" regions, from the point of view of number of triggers and timing alignment (thus excluding the weird ranges of point 1) above).

Unless any detector expert sees the need to calibrate runs in the rest of the run period, and please let me and Zhiwen know before this evening if it's the case, I'd say we could move on with the DNP cooking.

Best regards,
Silvia

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*                                                                                                                  *
* Dr. Daniel S. Carman                  e-mail : carman at jlab.org<mailto:carman at jlab.org>                     *
* Staff Scientist                              office : (757)-269-5586                         *
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