Camilla, Jennie W

Camilla and I reran the camera offset tests yesterday while in observing. There is a clear effect from yaw offset changes in the build-ups but not so clear with pitch changes.

See this image for the CAM2 servo steps and this image for the CAM1 servo steps.

CAM 2 YAW

The lowest yaw offset gives highest circulating power and highest power on POP A, B and REFL A PDs and the highest yaw offset gives the lowest power values. The lowest offsets give a dip in the range, as does the highest yaw offset. The best offsets for range seem to be close to nominal, the second highest offset step (-414 counts).

KAPPA C is highest at the lowest yaw offset, which makes sense as this is when we have the best build-ups.

CAM 2 PITCH

For the pitch as mentioned above the steps are not obvious in the circulating power plot or the POP A/B / REFL A plots. There is maybe a correlation between the lowest offset and the lowest power build-up, and the second highest offset and the highest power build-up but no clear correlation with the range or KAPPA C.

CAM1

This has similar trends to CAM2 however I think thye pitch is correlated the opposite way from 1 whihc makes me think that the motion the pitch causes is just some swaying f the alignment as the camera offsets change and it doesn't particularly matter which way we change them in pitch. The yaw offset change though shows peaks at lowest offset, troughs at highest offset and best range near nominal offset and highest KAPPA C (optical gain) at highest yaw offset.