Attached is the calibrated spectrum with PSL (red). References are all with the old refcav setup. Apparently PSL doesn't look good, but don't take it too seriously (yet).
When I took the data I've turned off the PSL laser room HEPA, PSL ante room HEPA and PSL room A/Cs off, and turned the make up air down to 30% level with an approval of Michael Rodruck.
Power fluctuation in the cavity is ridiculously large (you can see that the beam spot is moving by the beam radius or more on the ETM), which might be due to high wind today. I'll take another shot tomorrow.
Also it might be that the Prometheus temperature is too low. It's not that I'm seeing that Prometheus is misbehaving, but in the past Bram experienced some problem operating it at too low or too high a temperature. I want to unlock the PSL refcav and raise the crystal temperature a bit but I don't think I'm qualified for PSL room.
BTW we tried turning ISS on and it didn't make any difference.
I left PSL fans and ACs like the following:
PSL laser room HEPA is off.
PSL ante room HEPA is running with 55% level.
ACs are on.
Make up air is running with 75% level.
According to LLO PSL fan manual, when nobody is in the room you can leave laser room HEPA off, ante room HEPA 50% and make up air 75% so this should be OK.