Reports until 16:19, Monday 15 September 2025
LHO General
ibrahim.abouelfettouh@LIGO.ORG - posted 16:19, Monday 15 September 2025 (86946)
OPS Eve Shift Start

TITLE: 09/15 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 5mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY:

IFO is in IDLE for CORRECTIVE MAINTENANCE

Promise! Today, we were able to get to LASER_NOISE_SUPPRESSION!

Witness to the culprit (In Jenne's words): The IMC_REFL power increases with IMC power increase.

There was a dust monitor that blew back some dust into the PSL that we think may have been the culprit but the Jason and Keita just came back from the PSL after looking for signs of this contamination but found none.

The plan now is to look at the IMC_REFL power increase again by setting the IMC power to 60W then to 63, whilst also trying a new combo:

Did IMC_REFL increase? We shall find out.