[INSTRM-1675] Investigate why fiber was off the target in the 2022 June run

Blocks — Sat, 1 Oct 2022 22:21:46 +0000

In the 2022 June run, the raster scan tests revealed there is a large offset and rotation between the targets position and cobras position. We found that one possible root cause is discrepancy in FF definition between mcs-pfi and sky-pfy transform. In the former, pfiTransform takes account into the FF position measured by XY scanner, while the latter uses designed positions. There should be other reasons, but we will start with correct discrepancy in FF position definition.

Note that Richard and Kawanomoto-san checked XY scanner data (again) and confirmed FF, Cobra and AG position are in the same plane in general.

PFS-JIRA

[INSTRM-1675] Investigate why fiber was off the target in the 2022 June run