jenne.driggers@LIGO.ORG - posted 13:05, Wednesday 11 October 2023 - last comment - 14:41, Wednesday 11 October 2023(73385)
NonSENS cleaning turned on during commissioning
While we're commissioning this afternoon, I've got NonSENS cleaning engaged. I've also temporarily accepted the SDF diff that turns on the cleaning, so that we can see the range of the _CLEAN channel in real time (this is why our range is high on our control room screenshots right now).
The NonSENS cleaning was on starting a few tens of seconds before 20:00:00 UTC today, and I intend to leave it as-is for at least an hour. Robert is doing work at this time, but it's quite minimally invasive, so this time should still be useful for PE verification software injections that are a part of the review of the cleaning.
Here is a plot showing the effect of the cleaning that is currently ongoing. Since Robert was able to significantly mitigate the 120 Hz peak yesterday, there is not much difference between the strain channel and the cleaned channel there anymore. But, our LSC FF needs tuning (measurements to be taken later this commissioning period), so there's lots of effect down there.
Both the Jitter and LSC noises were retrained on data from our most recent lock. The high frequency laser noise I havne't retrained in several weeks, and it's still doing quite nicely.
This quiet period ended at 20:22 UTC (for calibration measurements).
Attached is the range plot from the control room wall, where we can see the improvement due to the cleaning being engaged.
Since we have lost lock, I re-accepted in the h1oaf Observe.snap file the correct value of 0 gain for H1:OAF-NOISE_WHITENING_GAIN, so NonSENS will be off (without any SDF diffs) when we get relocked.