(Jax, Alexa)

Yesterday we observed that the transmitted light from the fiber was entirely the wrong polarization. This morning, we started out by changing the settings on the MPC.

Settings for X-bound fiber: +18.75 -60.00 -4.50

Initial Y-bound settings: +5.70 -25.35 -56.85

The PD on the fiber monitor path is likely misaligned so we had to optimize based on minimizing power on the fiber polarization PD. Given that criteria, we started with the X-end settings and adjusted to a nominal condition.

Y-bound settings: +18.6 -61.35 -42.30

No guarantees we won't be commenting on this entry later with updated settings.