In the movie linked in alog 52927 we saw the phase camera begining to fail in a way we hadn't seen before, around 35s into the movie. We ran it again during throughout the lock acquisition today and it lasted much longer into the lock however it started to happen again. It seems the resonant circuit used to drive the pockel cell has reached some temperature limit after prolonged use. When we reduce the driving voltage by half we start seeing the same images as we did before, except with 50% reduction in amplitude. Leaving it to cool down also seems to fix the problem for the first few images but the it starts up quickly again. Something to be fixed in the next version.

We also wanted to try the CO2X test again (agreed with Keita) where we drop CO2X and then raise it up again to see how the carrier+sideband mode matching changes. The change will be small +-100mW left over an hour. Short jumps out and back into observing will be required, I'll comment GPS times when we start.

However we just had yet another GRB event so we're standing down again, hopefully can try this later.