Following yesterday's work in 62963. [ Aidan, Ryan, Camilla ]
We are leaving the EX HWS SLED keyed off, the the HWS plate on and code running with camera frequency at 1Hz. Hope to check that there is no leakage light from 1064nm (or other wavelengths) into the HWS over night/ locking tomorrow AM. As Aidan describes in 62967.
Today we wiped and vacuumed the HWS side of the optical table and cleaned all the HWS optics and the ALS lower periscope mirror, one upper periscope mirror and ALS-M11 (BS that couples HWS and ALS) with isopropanol, lens tissues and hemostats. They looked so much cleaner afterwards! I'll post photos later. Sadly our HWS beam still looks much the same.
Attached are images of the optics before we cleaned them, the worst offenders were upper and lower periscope mirror (which are both angled upwards) M1B, ALS-M11 (BS), MS1, M5, BS. Images afterwards looked very clean!
Also in the document is an image of Ryan using the tiger vac to clean up loose dust in the enclosure before we started cleaning.
The black foam that seals to two door panels is disintegrating, see image of my glove after rubbing it. We could replace these panels but I don't think it's really an issue as the foam is on the outside of enclosure when closed and there wasn't really much dust on the optical table itself when we wiped it with wipers.
In alog 63021 I state that there was no IR light seen during the overnight test. Looking at the ndscope plots from this time we were only injecting 2W of IR beam into the IFO and it stayed locked at state 435. We unlocked the IFO at ~8:10amPT and saw no difference in PROBE_SPHERICAL_POWER or PROBE_TOTAL_PIXEL_POWER.