jason.oberling@LIGO.ORG - posted 15:41, Wednesday 12 July 2023 - last comment - 18:18, Wednesday 12 July 2023(71273)
PSL Recovered after EX Interlock Work
After today's EX interlock work, I have recovered the PSL. Everything came back without issue. When engaging the ISS, I had to adjust the RefSignal from -2.0 V to -2.02 V to get the diffraction % to ~2.5%. For the EVE operator, if the diffraction % drifts low as the laser continues to warm up over the next few hours (which we've seen in the past), the RefSignal will need to be adjusted again.
The diffracted power had indeed drifted low as the laser warmed up, so I tapped the Ref Signal from -2.02 V to -2.01 V to get the diffracted power back closer to ~2.5%