This morning while TJ was trying to relock, ETMX HEPI tripped again. Kiwamu, Sheila and I all poked around at this a bit and can't find an obvious culprit yet. It's definitely something to do with the X HEPI position (tidal or something else). First attached plot is the ETMX actuators time series at the trip. The little shark tooth just before the trip seems to be caused by something in tidal (a reaction to HEPI walking off, maybe? Or something causing the IMC to do something weird?). When I looked a the cartesian signals, the movement seems to be all in X. The second plot is the time series over the same 32 second window of a few other signals, but none of them are particularly enlightening. The dark blue trace on the middle left is the HEPI X location, which goes on some 30 micron excursion, which ultimately causes the lock loss. But the motion seems to be chickens/eggs. Did tidal get some other input that drove HEPI or did HEPI go crazy and drive off tidal? I don't know.