TITLE: 12/03 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC

STATE of H1: Observing at 69.8653Mpc

INCOMING OPERATOR: Patrick

SHIFT SUMMARY: Lockloss as I tried to switch the ISI config to prepare for a "big" earthquake as reported by Terramon (6.0M in Alaska). Turned out Terramon predicted R-wave amplitude wrong by a factor of 7 and this ISI config change didn't have to be done. Most of the struggles were due to sudden drop of AS90/POP90 after DRMI ASC was engaged (it wasn't obvious to me at the time since the drop happened further down the path, mostly at DRMI_LOCKED). As I started an initial alignment I went through Jenne's troublehoot document that reminds me I should have looked at the error signals. After the initial alignment was done I went back to locking DRMI and zeroed the SRC1 and SRC2 error signals by moving SRM and SR2. I had to walk both SRM and SR2 to zero the error signal. The rest of the locking sequence went fine. 500-510Hz violin modes came back high and saturated the OMC DC PD so I sat at DC_READOUT and wait until the modes are somewhat damped. All the ISI ST2 configs are still BLEND_250_SC_A as Ed had them.