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[Daniel Cebra <cebra AT physics.ucdavis.edu>]

Hi Gene,

  Considering point 1), I agree with your conclusion that space charge corrections should not be needed for the run 21 FXT runs (expect for the 3.85 GeV data set - that data set was run with higher luminosity, the others kept the lower luminosity constraints which had been used in runs 19 and 20).

   I don't have any insights on Irakli's T0 calibration.

   As a quick note... when we do produce the run 21 FXT runs, we should also produce the yellow data stream (zero bias). These are needed to confirm the Glauber centrality work.

regards, Daniel

On Tue, Aug 8, 2023 at 11:10 AM Van Buren, Gene via Star-tpc-l <star-tpc-l AT lists.bnl.gov> wrote:

Hi, TPC-ers

I'm trying to prepare for a calibration production of Run 21 FXT datasets, because the production_3p85GeV_fixedTarget_2021 dataset is of moderately high priority for analyses, and Yuri prefers to have all FXT datasets for a year produced at once for the dE/dx calibration work. To that end...

1) I have finished a calibration of SpaceCharge in that 3.85 GeV FXT data, and I am inclined not to pursue such a calibration for the other Run 21 FXT datasets because I see much lower rates in the BBCs for those other energies. I can present on this at Thursday's meeting.

2) I have confirmed that the event-by-event T0 calibration work that Irakli, and subsequently some students, performed for 2019 and 2020 FXT datasets has NOT been done for 2021 datasets. Irakli is not immediately available to do this, but says he could put it on his to-do list. I can alternatively, very quickly, calibrate my alternative event-by-event T0 for the five Run 21 FXT datasets within the next couple days before Thursday's meeting. I don't typically make any global <T0> adjustments when I do that correction (I purposefully have kept the mean of the prompt hit time distribution unchanged, only narrowing it through the event-by-event correction), but I think Irakli's correction typically do make an overall <T0> shift to match the vertices from the two TPC halves. So the question I have is whether the various other T0s are in reasonable shape for Run 21 FXT datasets, and if not, what do we need to do to get there?

Thanks,
-Gene
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