[Keita, Oli, Jenne]
To make relocking the IMC easier during the HAM1 work, JM3's damping has been significantly increased. Oli did mention that the JM3 damping loops haven't seen much real tuning yet, so even when we discontinue this overdamping, we may want to spend some time on them.
Attached are screenshots of JM3's damping loops before we tuned anything, as well as how we're leaving JM3 overdamping for now.
The spectra show JM3 damping, but with gains of -2 in each of the Pit and Yaw loops as the references (so, a little more damped than they were yesterday), and then the live traces are with the overdamped situation.
As a comparison, Oli pointed me to this old alog 62672 with a similar suspension's damping loops measured.
Tried the same thing for JM1, but the LL and UR coils rail once in a while because the alignment slider offsets are larger for JM1. Even without any damping/feedback, the DAC output for JM1 LL and UR are ~96 million counts (they rail at 134 million).
I decreased the gain by a factor of 2 for JM1.
[H1:SUS-JM1_M1_DAMP_P_GAIN, H1:SUS-JM1_M1_DAMP_Y_GAIN]=[-10, -20], [H1:SUS-JM3_M1_DAMP_P_GAIN, H1:SUS-JM3_M1_DAMP_Y_GAIN]=[-20, -40].
Elliptic lowpass as well as YAW "boost" were disabled for both.
