TJ, Rahul
ITMY mode 05 and mode 06 have been rung-up since morning and TJ and I have tried several settings to bring them down. The settings which is currently working is listed below in bold font,
New settings for ITMY 05/06 (not yet committed to lscparams file):-
FM5 + FM6 + FM10 Gain 0.01 (phase -60 degrees)
The other settings which I unsuccessfully tried as follows,
-60deg phase -0.01 gain - increase
zero phase -0.01 gain - increase
+30degree phase -0.01 gain - increase
Similarly TJ efforts (from morning to noon) are also given below,
Settings tried for this lock below. There was commissioning going on during this time, so I worry that a few of the ones I tried were made worse by measurements.
Phase, gain - result
-30deg , -0.01 - Slow increase
-60deg. -0.01 - Slow increase
-90deg, +0.01 - very slow increase
+30deg, +0.01 - no increase, no decrease
+60deg, +0.01 - maybe no increase or decrease?
Commissioning measurement might have confused this one 0deg, +0.01 - increased
Looks like IY05 is now increasing (as per narrow filter, broad filter shows decreasing) and mode 06 is decreasing. Since mode 06 is higher than mode 05, I will let the current settings damp it for now.
Current damping using FM6 + FM7 + FM10 Gain 0.01 (-30degree phase) - not sure if this is working yet. Will keep an eye on it tonight.