[Poltarg12] [Rgc] comparison of NMR and beam asymmetries

[Sebastian Kuhn]

It’s even more encouraging - if we look at the FC-corrected High Momentum Electron asymmetry (bit29, 60m), it went from + 0.02
https://logbooks.jlab.org/entry/4042668
to -0.019
https://logbooks.jlab.org/entry/4042803
Apparently the FC correction really works now! And of course one has to wait long enough for the 60-min average to settle for a final value.
But the best news is that we get nearly as much negative polarization as positive, and quite stable (and according to Harut -
https://userweb.jlab.org/~avakian/tmp/all-rgc-run-dep-16980-16995.nh3.pdf )
the real polarization is even closer to 80% than 70%. All very promising!
Now let’s keep our fingers crossed that Hall C won’t mess us up!
- Sebastian

> On Sep 17, 2022, at 7:31 AM, Christopher Keith <ckeith at jlab.org> wrote:
> 
> After yesterday's anneal, the NH3 target was polarized to an NMR reading of +77%, and a short run was taken.  Starting at 21:30 the polarization was reversed to -72%, and the beam was turned on about an hour later.  Here's a plot that compares the NMR and the 30 and 60 minute running averages of the online beam asymmetry.  The NMR scale is -1.0 to +1.0, and the ASY scale is -0.03 to +0.03.
> 
> The asymmetries reverse sign from 0.023 to -0.0156.  After 4 hours of beam, they decay to -0.014, a relative drop of about 10%.  The NMR decays from -0.725 to -0.684 in the same period, a drop of about 6%.
> 
> The NMR shows a reversal "efficiency" of -72/77 = -0.94.  The ASY efficiency is only -0.68.
> 
> 
> This is very encouraging.  Thanks!
> 
> 
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