Evan, Kiwamu, Jenne, Stefan

- DRMI alignment is back to the old-good one: strategy: Used old slider values for everything but large optics. Tweaked SR3 (for instance) to get the beam spot centred on ASPD. Aligned PRX using PRM and PR2.
- DRMI ASC worked except PRC2 loop (didn't further investigate because we didn't care without the arms)
- Then we focused on MICH freeze:
  - We fine-tweaked the transfer function using a zpk([0.03],[0.054],1,"n")gain(0.555556) filter.
  - This made the gain roughly 1 below 0.1Hz. Plot 1 shows that - if measured coherently - we win up to a factor of 10 reduction at 0.01Hz. (Blue: no MICH freeze, red: MICH freeze)
  - In terms of RMS reduction (position) of the power spectrum, we gain a factor of 2, at the cost of significant noise injection at 8Hz. (Plot 2)

Interestingly, this RMS is now small enough that we spend most of the time in about 1/3 for the whole simple Michelson fringe. Unfortunately there is still slow drift, so parking at a "good" position isn't quite possible. But we are definitely in a regime where simple "fringe velocity" isn't a good parameter by itself. Fringe position must matter too. In our brief attempt to see locking performance changes we didn't notice anything significant though.

However, the next time we have high winds, we should definitely re-evaluate MICH freeze.