J. Driggers, J. Kissel, Y. Lecoeuche, K. Merfeld, P. Thomas

We continue along the path to recovery from our initial alignment reference loss. Attached are blow-by-blow notes and how-to details for perusal and future reference. I summarize the action below. I hand off the fight for alignment back to Jenne.

The afternoon, we were able to get up to and be stable at PREP_ASC_FOR_FULL_IFO (after a few more annoying tantrums from ALS X WFS DOF1 PIT, and a 12 minute "how do we fix THIS?" FSS freak-out). 
Once there, we went the ENGAGE_ASC_FOR_FULL_IFO, but immediately turned OFF ADS3 DOFs which get turned on in that state. 

Once there, Niko and I spent *several hours* slowly bringing in the ADS error signals, using a combination of the appropriate call to the "move_ARM_dev.py" script  to collectively / slowly move the arm cavity optics (while the corner station ASC followed) and adjusting PRM. 

While this was happening, Jenne and Kara were adjusting the position of the TMS in order to better center the beam spots on the red and green QPDs. Once better centered, they updated all green initial alignment offsets:
                        PIT          YAW
         Gr Camera Y =    239.3,        210.7
         Gr QPD Y A  =    -0.4 ,        0.76
         Gr QPD Y B  =    0.82,         0.01
         ITMY A2L =    -3.0          0.0
 
         Gr Camera X =    235.82,       332.9
         Gr QPD X A  =    -0.144 ,      0.571
         Gr QPD X B  =     0.709,      -0.073
         ITMX A2L =    -3.965,       0.055

We were recording "save points" along the way, and the last point before we started making explorative changes was 2019-07-31 22:07 UTC.

The arm / PRM moves were able to get all error signals but ADS3 (PRM) PIT close to zero at that save point. Any amount of moving PRM's alignment sliders had no affect on its supposed error signal

Jenne then thought that perhaps we're on "the wrong side" of the ITMY point absorber, so began moving spot positions to find this out (all the while continuing to update initial alignment references). 
We found that the ADS lines in DARM were indeed getting smaller by changing the spot position.
This confirms that we're in a collective global alignment that's hitting the other side of the point absorber.
However, in this new position, we lost the ALS lock of the green arm ... fishy.

We decided at this point there were three options, since we were essential finding out a new good spot position -- and doing it at 2W, which we don't want:
     (1) Move on to increase power and cross our fingers.
     (2) Restore initial alignment references and all sliders to "the last save point," and ... see what happens.
     (3) Restore initial alignment references and all sliders to the beginning of the day, and just cross our fingers that we get lucky again like last night.

We moved forward with option (1) first -- BUT we were too aggressive. While focused elsewhere, we hadn't noticed the ETMY MODE1 and MODE6 had rung up to all get out -- likely because in this awkward global alignment space, the phase and gain settings for this already problematic mode became wrong, and we were driving it up. As such, once we transitioned to DC readout, the DCPDs were well saturated, and we couldn't fix it in time.

So, we moved on to option (2). While down, Patrick and I reverted everything to the last save point.

After doing so, we were able to quickly and easily get back up to PREP_ASC_FOR_FULL_IFO, repeat the steps to get through ENGAGE_SOFT_LOOPS mentioned above (though thankfully now with the saved good alignment sliders, we didn't have to go through the excruciatingly slow reduction of ADS error signals), and now Kara and Patrick focused on damping ETMY MODE 1 and 6.
We spent a god 30 minutes there, damping the violins, but power buildups were wandering all over the place under the influence of the SOFT loops.

We were some of the way through getting the modes under control (probably needed another factor of 5 in peak ASD), when I think we wobbled just that much too far in power build-ups and we lost lock.

I'm handing over to Jenne.