Camilla C, TJ S

This morning we had another period where our range was fluctuating almost 40Mpc, previously seen on Dec 1 (alog81587) and further back in May (alog78089). Camilla and decided to turn off both TCS CO2s for a short period just to completely rule them out, since previously there was correlation with these range dips and a TCS ISS channel. We saw no positive change in DARM during this short duration test, but we didn't want to go too long and lose lock. CO2s were requested to have no output power from 16:12:30-16:14:30UTC

The past times that we have seen this range loss, the H1:TCS-ITMX_CO2_ISS_CTRL2_OUT_DQ channel and the H1:SQZ-FC_LSC_DOF2_OUT_DQ channel had noise that correlated to the loss, but theISS channel showed nothing different this time (attachment 2). We also were in a state of no squeezing at the time. So it's possible that this is a completely different type of range loss.

DetChar, could we run Lasso or check on HVETO for a period during the morning lock with our noisy range?