Started yesterday evening. Doesn't seems to be equally spaced.
It could be pickup through the unshielded part of the RTD cable (where it comes out of the laser), but it's strange that it started in X and Y at the same time. Can you check the FLIR cameras are turned off on the MEDM screen.
Apparently there is a "glitch" in the laser power of both X and Y TCS systems every time the Laser power meter sees a request for a power change. (see 1 day trend with additional channels to correlate with). However, this did not just start yesterday, it has been going for at least a month (see second plot of the last 3 days). I spot checked back a month and the behavior is the same. Note, there are a few extra spikes on these channels but this doesn't seem to be new behavior.
Update: I looked closer at these glitches.
Characteristic:
A single glitch spans across multiple sample points, lasted a little less than half a second. Almost everyone of these glitches lead by one smaller glitch that's roughly 1.5 second apart, followed by an even smaller glitch and immediately followed by a larger glitch.
Timeline:
I looked back several months and it seems like these glitches started to show up much more frequently on May 13th this year (started at 16:28 UTC to be precise). I looked back on the alog and didn't find any invasive work with the TCS on May12th or 13th.
