Abstract:
I implemented ADS for PRC.
POP 90 signals are used for feedback and PRM and PR2 were actuated for PRC fine alignment.
PRX_ADS_ENGAGED state are implemented to the guardian.

Detail:
I tried to align PRC by using ADS.
First, I tried to used POP DC signals for feedback when PRMI is locked with 3F signals.
However, the ADS seems not working, probably due to the bad S/N ratio.
So, I locked PRC with 1F signals (POP 45) and  used POP 90 for ADS signals, which is the same way during O3.

This scheme seems working well and sideband power of POP 90 increases (fig1).
After succeeding the PRC alignment with ASC, I implemented it to the ASC_LOCK guardian.
Now, ASC can be enaged by requesting PRX_ADS_ENGAGED state to ASC_LOCK guardian.
However, to lock PRC with 1F signals, we need to change the signals used for LSC manually fro REFL 135 to POP 45.
I will engage the state for locking PRX with 1F signals soon.