[Sheila, Jenne]
We have had a violin mode at ~ 508.29 Hz rung up for the last several days.
Part of the problem was that the ETMY Mode7 filter was railing at its limiter. This filter bank has the new "flat phase" filter that is being tried, for damping many modes at once. Evan ramped the gain to zero for this filter bank. After ~30 minutes we didn't see any noticeable change in the height of the peak.
The only other filter bank that was enabled was the Mode5 bank, with a 506-513 band pass. We turned off the "-60deg" FM2. After an hour and a half or so, we see the height of the violin mode has been reduced by almost a factor of 10. We'll check back on it tomorrow.
Also, there is a new violin mode blrms screen, accessible from the quad overview screen.
When looking into seeing if the violin mode is still going down, it occurred to me to look at the output of the violin filter module (ETMY Mode 7) that Evan set to zero last night. Turns out it's been railing for days. My guess is that this was turned on for testing of violin mode damping, and then never added to the guardian so it never gets turned off (violin mode damping should only be on when the IFO is locked). Ooops. It's been off since last night, which is good.
Plotted are the Mode 5 output, which gets turned on and off appropriately, as well as the Mode 7 output which is just going rail-to-rail (where the rail is set by the filter bank's limiter here).
