Jennie W,

Last night I added a second pole to the JAC controller with the view to increasing the damping. It has not helped (JAC temperature is still oscillating after ~20 hours).

This is no improvement on how long it took to damp when we increased the set power of the JAC on Tuesday 18th alog #91587.

After thinking about it a bit more and comparing the temperature stability before and after I increased the gain magnitude of the servo (also on Tuesday 18th), I think our gain is too high and causing the system to oscillate.

I think the order of operations over the weekend is to remove the second pole, turn down the gain and then set up the guardian node to add in the PZT feedback signal to the heater controller error point. I will test this over the weekend when it won't affect corner commissioning.