- Found the IFO locked at 6am (NLN)
- Performed some SRCL noise injections:
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SRCL filter "Oct23" FF on
SRCL noise
1224509280 Oct 25 2018 13:27:42 UTC
1224509966 Oct 25 2018 13:39:08 UTCSRCL FF off
SRCL noise
1224510092 Oct 25 2018 13:41:14 UTC
1224510701 Oct 25 2018 13:51:23 UTC
SRCL noise with 3-10 Hz more amplitude
1224510859 Oct 25 2018 13:54:01 UTC
1224511480 Oct 25 2018 14:04:22 UTC
SRCL FF noise (with ITM broll on)
1224511544 Oct 25 2018 14:05:26 UTC
1224512177 Oct 25 2018 14:15:59 UTC
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Lost lock at 14:23 UTC while trying to measure SRC1 pitch loop. My fault
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Tuned a new SRCL feedforward. This includes a notch at 1.1 Hz to avoid instabilities. The new FF (Oct25 FM) works better at low frequencies, but inject much more noise at around 3-5 Hz. No sign of instability for a five minute period. Reverted back to the original Oct23 FF for now. In the attached plot, the difference in noise at 100 Hz is likely uncorrelated (noise in that region was fluctuating a lot)
