FAMIS 31095

Late to this check this week, but not too much to report. Jason's incursion last week for an FSS tuneup (alog85769) is clearly seen, and generally things have been stable since. Only strangeness is a noisier FSS TPD signal as of about 2 days ago, which I looked a little closer into.

Zooming in on the FSS TPD signal during an observing period (see second to last attachment), these look to be brief jumps in power on the TPD on the order of 20-30mV that I don't see evidence of anywhere else; AMP2 output, PMC output, and ISS actuation all seem nominal during these times. These jumps look to be happening constantly any time the IFO is at or above the 'LOCKING_ALS' steps, and it was during this step during relocking after Tuesday maintenance when the jumps first started. The only thing that changed during Tuesday's maintenance period that might have an effect is the sat amp modifications to MC1 and MC3 (alog85922), possibly changing something about the IMC's feedback to the FSS? See final attachment for behavior while the IFO is unlocked and the FSS TPD signal goes quiet. I've been watching the RefCav REFL camera spot while these jumps happen, and I do notice a very slight shift of the spot, but not a change in shape. I'm not sure how to explain this behavior or why it would have started, but at least so far it hasn't seemed to be much of a "problem," although I'll be keeping an eye on it.