How does Cbar22 depend on BPM tilts? Run the following simulation:
Plot Cbar22 at each BPM as a function of that BPM's tilt. Recall: Rich Helms predicted that Cbar22(observed) ~ Cbar22 + theta * (Cbar12^2 - Cbar22^2 - 1).
We find that the "measured" values are roughly correlated in the same fashion that our theory predicts. Considering the lack of actual coupling or any errors (resolution, etc), the agreement is rather poor.
Now let's try turning sk_q02w on @0.01:
It seems the agreement between Rich's theory and my simulation is best for BPM tilts < 5mrad.