Tara added some more juice to the north cavity heater last night. Now we can lock both cavities to TEM00 and get a beat within the bandwidth of the 1811.
Beat frequency drifted to 61 MHz over the course of a few hours. We need to wait for the cavity temperatures to settle.
I improved the mode-matching a little bit on the south cavity; it's about 50% (the theoretical max is 71%). The south lenses are now on translation stages.
I've attached a beat spectrum. Nothing is floated, RAM is not optimized, etc.; this is just a rough indicator of where things stand.
Here is what I think should happen next, in rough order of importance: