Sheila, Matt, Daniel, Camilla.

We went to the SQZ racks to check the loops, all (LO, OPO, CLF) looked stable, the OPO looked peaky but stable. Once we opened beamdiv and were squeezing there was the large oscillation in ndscopes which SR785 showed to be at 14kHz.

Issues seen:

• Yesterday AM: 82874 and plot attached, issue started when IFO unlocked and Beam divertor closed, continued once IFO re-locked and SQZ injected.
• Today while we were measuring SQZ loops. plot attached, issues worse and OPO_TRANS_POWER bad  when in FDS with beam div open (POISTION = 0) and LO locked,  issues less when beamdiv closed.

We think it could be FSS or PMC or laser going multi mode. Can see EOMRMSMON gets worse when this noise appears. Will continue to investigate tomorrow.

Tagging OpsInfo, if you see this oscillation i.e. SQZ is injected but DARM looks terrible like NO SQZ, try taking SQZ out and in again, if this doesn't help, go to Observing with NO SQZ tonight, using Ryan's wiki Instructions.