daniel.vander-hyde@LIGO.ORG - posted 13:04, Tuesday 10 July 2018 (42839)
ITMY Hartmann sensor angular sensitivity to SR3 and ITMY
TVo, Stefan, and Danny
We adjusted the pitch and yaw of ITMY and SR3 by a microradian while observing the x and y prism channels as well as the Hartmann gradient/contour plots. We also looked at the spherical and cylindrical power but didn't see any significant change.
| ITMY | Pitch (1 µrad) | Yaw (1 µrad) |
| Prism X | <0.1 µrad | 1.75 µrad |
| Prism Y | 1.8 µrad | <0.1 µrad |
| SR3 | Pitch (1 µrad) | Yaw (1 µrad) |
| Prism X | <0.1 µrad | 4 µrad |
| Prism Y | 4.3 µrad | <0.1 µrad |
We noticed that there is not a lot of cross coupling between Pitch to Prism X and Yaw to Prism Y.
Note that there is a fringing pattern in the contour plots (see attached) as we moved both ITMY and SR3.
Images attached to this report
