Ops Shift Transition: 04/29/2019, Day Shift 15:00 – 23:00 (08:00 -16:00) - UTC (PT)
State of H1: NLN
Intent Bit: Observing
Weather: 10-20 mph wind, sunny
Primary 0.03 – 0.1Hz: 0.1 um/s, rung up from 0.01 um/s by a 6.2 earthquake at Carlsberg Ridge
Secondary 0.1 – 0.3Hz: 0.15 um/s
Outgoing Operator: Travis
Quick Summary: Been locked for 11 hours at ~110 Mpc. There is a very slow oscillation in the ASC signals and we’re riding out an earthquake, but the lock seems stable.
The ASC oscillation is due to the SR3 heater change that we made on Friday. This slow ASC yaw oscillation was seen when the SR3 stepping down tests were done a few weeks ago, but at that time they only started seeing it clearly when they took the SR3 heater down to 3.5 W (We're at 4 W now, from 5 W last week and before). I'm not yet totally sure why the SR3 heater being lowered makes this ASC change, but I'll start looking into it. As Niko and other operators have mentioned, the IFO is locked and stable otherwise, so I'll do some passive investigations but nothing active yet.