Yuta, Kiwamu,

We continued working on the alignment automation this morning. Today's emphasis was on the dither alignment of PRY. It is now successfully coded in the LSC guardian.

The next step is to make the PRX and PRY dithering systems sequential so that we can run them by pressing only a single button.

Dither alignment:

Currently we use Stefan's IAL to dither ITMY. The POP18 signal is temporarily routed to the ADC and demodulated in IAL. Since the middle masses didn't give us a big excitation in the angle, we decided to use the top mass to excite the angular motion at around 2 Hz for pitch and yaw. The demodulated signal is also fed back to the top mass. This worked pretty well.

The guardian was modified to include the dither alignment. We checked the functionality a couple of times by going through the initial state to the dither state. It is functional although we are not 100% confident with our guardian code.