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H1 SUS (SUS)
julia.rice@LIGO.ORG - posted 14:02, Friday 30 May 2025 (84671)
Violin damping May 30 2025

Julia, Georgia

We turned on violin damping filters during lock using the 2W Gaurdian settings.

Some problematic modes:

For ETMY mode 1, we noticed that despite using the 2W damping setting, the gain for this filter was 0.1 (rather than 0, which is the value set for the gain in the 2W setting in the VIOLIN_DAMPING.py script). Since we were ringing up the mode with -0.1, we tried setting the gain to 0.05. This successfully damped.

We looked through the VIOLIN_DAMPING.py script and found that the 2W settings were not actually being executed for any of the modes. Georgia found a possible typo in the script where an iteration is ran through "modes.key", but the list is titled "mode" (not "modes"). Georgia then edited this line of code, changing "modes.key" to "mode.key" to fix the issue. We'll confirm this the next time we attempt violin damping when lock is aquired.

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