[Rgc] RGC-analysis meeting tomorrow (Tuesday)

[Sebastian Kuhn]

Dear RGC-ers,

relating to Kayleigh’s presentation today, I looked up the logbook entries around the time those 2 “suspiciously low polarization” Moller runs were taken:
<https://logbooks.jlab.org/entry/4007425>
logbooks.jlab.org<https://logbooks.jlab.org/entry/4007425>
[X]<https://logbooks.jlab.org/entry/4007425>

Turns out they were taken during a SPIN DANCE! So, the 0 degree Wien angle is CORRECT and was done on purpose to understand the machine tune and optimize the longitudinal polarization for all halls. SO: we can totally ignore those runs. As I said, we could relax the limit on the beam charge asymmetry a little (e.g., to +/- 0.4% instead) so we get a few more runs and then look again at the entire summer period for only those runs that meet that criterion as well as having at most 2% statistical uncertainties. I hope that this would give us a clearer picture after we remove all of the spin dance runs referenced in above logbook entry (or, even better, any other systematic studies or periods of malfunctioning Moller referred to in relevant logbook entries).

In general, as I said before, if there are outliers or otherwise suspicious results from Moller runs, we should really look at the logbook - not just for the Moller runs themselves, but also shift summaries encompassing the time they were taken, and maybe even daily RC reports. All I did was go to the HallB logbook “HBLOG”, select the time frame of interest (summer 2022) and searched on the word “Moller” anywhere within the logs. So it’s not really THAT cumbersome to do…

- Sebastian

On Feb 26, 2024, at 9:25 AM, Silvia Niccolai via Rgc <rgc at jlab.org> wrote:

Dear all,
tomorrow (Tuesday) we'll have our weekly RGC-analysis meeting, at 8:30AM,
zoom link: https://jlab-org.zoomgov.com/j/1601890334

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