Ed, Kiwamu, Sheila (on phone)

The attached is the new AS36 I matrix which was able to stabilize the SRC1 loop, at least for 30 minutes. I changed only one element, SEG3 -> PIT element. It was -0.487 and now -0.6. Before this modfication, Ed and I closed the SRC1 loop with the old element. Seemingly issue was in pitch which ran away very slowly on a time scale of 5 minutes or so. We then opened the pitch loop and manually aligned SRM so that it maximizes the AS90/POP90 ratio. Then, looking at the error signal, we have determined the desired value for the element. No physics involved.

For OPS,

If the SRC1 loop is still unstable or slowly drifts (which should be visible as increased POP90 on the striptool), the first action should be to open the SRC1 loop by simply zeroing the loop gains.