Eleonora, Camilla
We repeated Eleonora's 68910 OFI shaking with longitudinal OMC shaking 20:14UTC-21:01UTC while we were waiting in OMC_WHITENING for the violins to damp. This means we were not in our full nominal low noise configuration.
Injected a 0.65Hz (Rahul's TF's in 69726) sine wave into H1:SUS-OMC_M1_TEST_L_EXC using 'awggui' command. Gain 3000. This could be seen as +/- 6um on DAMP_L_INMON, with some cross-coupling in other degrees of freedom, see attached.
- 20:14- 20:18UTC ramping up gain to get good sized shelf.
- 20:18 - 20:29UTC 0.65Hz with G 3000 - with SQZ
- 20:29 - 20:39UTC No shaking, quiet time - with SQZ
- 20:40 - 20:50UTC No shaking, quiet time - No SQZ
- 20:51 - 21:01UTC 0.65Hz with G 3000 - No SQZ (no difference)
This was more data than the 10 minutes Eleonora asked for but I had the time while the violins were damping. She would like this repeated for OPO and FC but I wasn't sure how the FC and IFO SQZ ASC's would react so will need to speak with Naoki first.
Eleonora suggests repeating with P and Y and at 2.6Hz to look for coupling. Attached is a plot showing DAMP_{L,T,V}_INMONs with offsets to bring them to zero. 6.7urad in L gives you 0.27urad in T so ~4% coupling.
