J. Kissel,

The verbal alarm began yelling about the OPO DACs were saturating this morning for no, as of yet, apparent reason. We traced it down to the *actual* OPOS saturating (because multiple suspensions are in the same front-end model could have been the OPOS, ZM1 or ZM2). Since the only control going to the OPOS DAC is the damping loops, I turned them off, and the saturations quickly stopped.

There's no report of anyone from the SQZ team being in or around HAM6 at the time, and there's no admitted cause. (see first attachment)
An ASD of the OSEMs, both before and after -- and out to several kHz shows nothing abnormal other than the extremely rung-up fundamental resonances. (see second attachment)
Closing the L, T, and V loops resulted in an even slower positive feedback run-away. (see third attachment)
Damping loop settings and filters have not changes since prior stable operations.

No idea what's going on. Further investigation needed.

For now, I've left the damping loops OFF.

I attach the .xml in case the future debuggers need a nice calibrated ASD template. Naturally, the date in the file name is wrong. Please ignore.