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Reports until 16:18, Monday 17 March 2025
H1 CAL
anthony.sanchez@LIGO.ORG - posted 16:18, Monday 17 March 2025 (83417)
Observing the ESDs during the CAL sweeps.

CAL sweep ESD Observations:
While checking the ESDs for saturations during the CAL Sweeps I found this signal shape during a CAL Sweep that we survived.
I can see there are different sections to the CAL sweep, and we tend to lose lock on this last section which is a 1200Hz signal.
While zooming in we can see a 40Hz oscillation that is ontop of the 1200hz injection.

There are multiple Locklosses in this section of the CAL Sweep, but there seems to be a common 40ish Hz oscillation on top of the 1200Hz that apears when we loose lock, But not when we survive it.

I am aware that there is an alog 82827 that mentions a 43.75 hz signal... which may need to be look into as the source of this oscillation.

Perhaps I should try to figure out what frequencies are being injected during the CAL sweeps.

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