Tonight we stayed locked at almost 15 W for an hour to get a nice steady state thermal lens measurement for the Hartmann (with limited success for ITMX, see log post 43981)

We lost lock in the same manner as last night, with the OMC suspension saturating. Hang and I had a quick look at the witness sensors for many optics and can see that over the duration of the lock PRM and SR1 are shifting by roughly 1 urad.

This attachment has many plots: top left is X arm transmission and pop rf18, which increase as we acquire but then decrease as we sit at 15 W and the thermal lens increases. Bottom left shows the test mass positions as measured on the op levs. Right plots shows PRM, PR2, BS, SR2, SRM witness monitors on the same timescale.