[Rgc] comparison of NMR and beam asymmetries

[Christopher Keith]

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!


Chris
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