Noticed this swing in PSL table North temperatures.
Also seen in AOM power, and slightly in IMC power in (though IMC power in is low, at 60mW).
Rotation stage has not been moved, and PMC Trans drop is reason we are at 60mW into HAM1.
Depending on what beam quality is needed for work on the SRC that's coming up, temperatures may need to be stabilized in the PSL, to stabilize power.
This looks somewhat similar to what we saw this last March with the AC causing swings in the PSL temp even though it was off (alogs 34497, 34586, 34642, 34673, and 34686. Final resolution was to turn the ACs off at the breaker box.). To my knowledge, the PSL AC units at LHO are only used to keep the HEPA fans from spiking the temperature when they are turned on when a PSL incursion is required and to keep the enclosure comfortable for those working inside, not to keep the interior enclosure temperature tightly controlled. Remember, the HEPA fans and AC units are turned completelly OFF, with the make-up air set to 20%, when the LHO PSL enclosure is in Science Mode (like during an observing run). In addition, the environmental controls have been ON since we swapped the aging NPRO at the beginning of the vent, so that could be contributing to the observed temperature swings.
In light of this, I have transitioned the PSL enclosure back to Science Mode (and turned the ACs off at the breaker box, which has been standard LHO procedure since the above linked March incident). I will let things stabilize over the weekend and re-evaluate the temperature on Monday.
I will also take a look at tweaking the beam alignment into the PMC on Monday, once temperatures have stabilized. This will require turning the picomotor driver in the HAM2 area ON; this driver was turned OFF for safety reasons while the corner station was being vented to atmosphere.