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oli.patane@LIGO.ORG - posted 12:24, Wednesday 16 October 2024 (80711)
BBSS August 30 - October 11th measurements compared to models

Oli, Ibrahim

As a follow-up to yesterday's alog (80689), attached are plots showing length and pitch M1 transfer functions for the four measurements between LHO and LLO taken between August 30th and October 11th, with different M1 blade positions, compared to their matching models (different d1 values).

The d1 values given in the legend for each model are the physical d1 values (based on the model), aka in the same set of d1 values as the ones originally given in the FDR document. Note that these d1 values differ from the d1 values given next to the measurements in Ibrahim's allbbss TFs from yesterday, since those d1 values are based on the actual blade locations and theoretical center of mass. So since these d1 values don't line up between the model d1's and the d1's we get based on where we put the blades, there is something more going on. The models don't correspond to where we would expect to see a bp of -4mm (avg), so this is something we will be discussing.

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