J. Kissel

After the large Earthquake ~24 hours ago (see LHO aLOG 29359) that tripped all BSCs, the fundamental violin modes have been quite rung up. So I've spent the evening behind the scenes babysitting the gains of the Violin Mode damping -- trying to push the gains us in amplitude to accelerate the damping without saturating the DAC, only slowed by a few failed attempts at switching the PUM coil drivers to a lower noise (and less actuation range) state.

I've basically been following the instructions as defined in Violin Mode Damping 101, and using the table and parameters defined in LHO's Violin Mode Resonances table. Occasionally, I'd get bold and nudge the phase of the filter by 60 [deg] here or there, but for the most part the filter settings as defined by guardian are good. 

If anyone needs them, I've saved some strip tool templates for the modes that were problematic tonight, they can be found in
/ligo/home/jeffrey.kissel/Templates/StripTool/
H1SUSETMX_ViolinFundamentals.stp
H1SUSETMY_ViolinFundamentals.stp
H1SUSITMX_ViolinFundamentals.stp
H1SUSITMY_ViolinFundamentals.stp
Of course, the ranges must be tuned in proportion to whatever gain the damping loops are set, but it's a few less MEDM screens to open and buttons to click to get started.