[Halld-tagger] rho beam asymmetry from 2018-01 ver15

[Richard Jones]

Alex,

These data are valuable in trying to understand how drifts in the diamond
edge sharpness factor into our physics performance. Is it possible to get
these fit result data in the form of a tree? Just the fit parameters and
their errors as a function of run number would be great, if possible.

thank you,
-Richard

On Sat, Jun 23, 2018 at 12:32 PM Alexander Austregesilo <aaustreg at jlab.org>
wrote:

> Dear colleagues,
>
> I used the first offline monitoring launch over the full 2018-01 data to
> extract the rho beam asymmetry for beam energies between 8.2 and 8.8 GeV.
>
> The PSigma values  extracted for 0/90 and 45/135 are consistent within
> 0.3% (absolute). You can find the fits to the full data sample in the
> attachment (rho_fit.pdf).
>
> I also looked at the individual orientations as a function of run number
> (rho_run_PSigma.pdf). No visible degradation of the polarization can be
> seen with the current precision. I will try to group several runs
> together and look at the polarization as a function of energy to obtain
> a better handle on this.
>
> The third plot shows the extracted orientation angle as a function of
> run number (rho_run_psi0.pdf). The offsets from the nominal orientation
> are in the order of 5% and seem to be quite stable during the run. In
> addition, all assignments from RCDB (colors) look correct.
>
> Best regards,
>
> Alex
>
>
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