We have now been locked for over 16 hours.
IMC REFL DC power is steady at 18.5 mW
IMC WFS A is at 0.95 mW and IMC WFS B is at 0.75 mW
The IMC power in is 62 W and the power at IM4 trans is 56.7 W
MC2 trans is about 9670 [mystery units]
This is reasonable power for IMC refl, but the WFS power is very low. These are the jitter witnesses, and jitter subtraction is not performing as well as it was before the power outage. I can think of several possible reasons for this, but I'm sure that having less than a mW of power isn't helping.
We may want to consider either a) increasing the power on the IMC refl path b) changing the splitter between IMC refl and IMC WFS to be a 50/50 instead of a 90/10, or c) some combination of the first two options that gets us reasonable power on both IMC refl and IMC WFS.
The numbers are confirmed to have held through the entire 40 hours of this most recent lock (killed by earthquake).
Looking back before the power outage, the nominal IMC REFL and IMC WFS powers at 60 W PSL lock were 18.6 mW for IMC REFL, 0.95 mW for WFS A and 0.76 mW for WFS B. So, we are now back to operating with our nominal powers at these PDs, except that the waveplate was adjusted to reduce the power to these diodes by half.
So, if we went back to the old waveplate setting, we would have double these powers. This would be too much power for the IMC REFL diode.
We have chosen to not make any further adjustments to this path.
