Sheila, Daniel, Terry, Corey, Craig, Nutsinee

Tonight we injected squeeze into the IFO at several input CLF power just to see if it makes any difference in noise level. All the phase settings were held the same. The 3uW transmitted injection was done in one lock stretch and the other two (4.5uW and 1uW) was done during another lock stretch (IFO will only stay locked 15 mins at a time). The LO common gain was 0dB (6dB for 1uW injection) and fast gain was 11dB for all injection. No boosts were engaged. We tried to see some squeezing/anti squeezing but lost lock shortly after as the IFO hits 15 mins mark from power up.

The weird hump at >1kHz came back during one of the lock stretch. I looked back and this seems to happen when SHG lost lock completely. So we must have injected uncontrolled CLF in and out of the OMC DCPD during the time (as SHG was scanning for lock point and OPO also was scanning for lock point).