Sheila, Matt, Elenna
In the midst of trying to diagnose various PI issues, we noticed DCPD sum was slowly increasing, but not from PIs. We eventually figured out it was ETMY violin mode 20. The gain was set to -1. I flipped it to +1 and then mode started being damped down.
Sheila updated the ETMY ring heater again to 1.5 W, and it looks like ETMY mode 20 phase has flipped back, and a damping gain of -1 is working once again.It appears that gains of both -1 and +1 are not damping the mode now. Corey is trying different phase filters.