I shut down the HEPAs in the ante room and in the laser room, shut down the 2 ACs (though I could not see their effect, so they could be left on) and set the makeup air at 30%. Overnight the temperature on the table increased by a couple to several degrees. The IMC was still locking, though very poorly. Paul tuned up the alignment of the IMC and the REFL_DC level returned to better than it had before the change (about 50 counts). The figure shows a comparison of IMC_F and the accelerometer at the top of the periscope in the two modes.
How much overpressure is in the PSL laser room when you run the makeup air at 30%? Do you see an effect from the makeup air at different speed? When I reduced it at LLO I did not see any difference in MC_F.
I saw 0.013" of water overpressure from the laser room to ante room.