To damp ALL 8 frequencies of the ITMX first harmonics.
MODE1 damps 996.53
MODE7 damps 995.36
MODE8 damps 995.64
MODE9 damps 992.43, 992.79, 994.28, and 994.73
MODE10 damps 996.25
MODE1, 7, 8, 10 MUST stay on if MODE9 is on.
The damp settings have been added to the table.
997.7169 Hz and 998.6645 Hz identified.
Tonight while collecting OMC modescan data at high power (with DARM on AS45), we found that one of the ITMx modes was ringing up with these new damping filters. The frequency was 995.645 Hz. We were able to construct a narrowband filter for this mode (FM5 on ITMX Mode8) and damp it easily, with positive gain and no phase shift. Since we weren't sure which of the new filters rang up the mode, we zeroed all of the gains (for filter banks mode1, 7,8,9, and 10) and also commented them out of the guardian. We'll have to work out later today which filter was providing the signal that was 180deg out of phase.
MODE9 damps four frequencies with 180 deg but will ring up the other four which have 0deg. I contructed individual filters for them and 995.6447 was one of them. However, I only set MODE9 gain to 40 while the others have gains of 100 hoping that they will be damped faster than being rung up by MODE9. Not sure what's wrong but if anything gonna ring up 995.647 it's the MODE9 filter.
How high did it get rung up? I watched it for hours before letting Guardian turned it on but didn't see anything then.