sheila.dwyer@LIGO.ORG - posted 15:53, Tuesday 21 October 2025 - last comment - 15:57, Tuesday 21 October 2025(87624)
gain scaling change reverted
I set the gain scaling back to use IMC INput power, since we had an unusual lockloss at LSC length control Elenna sees is related to LSC loop gain changes.
This change should have made a 5% change in the loop gain, so if this was the reason for the lockloss one of our loops is very close to unstable.
Here is a scope showing the LSC loop ring up. The ring up started about 10s before lockloss which coincides with a few gains and filter changes in the LSC loops.