- Although I forgot to mentioned about it in the 1PM commissioning meeting, but I was sure that the one drifted last night was the ITMY because the beam position on the ETMX also drifted.
- Also I checked the control signal of the DC control, and it indicated the drifting optics was the ITMX.
- I checked the OPLEV signal and it had a huge jump when the cryo cooler was turned on. I would say that it might be worthful to replace the oplev.