S. Dwyer, K. Kawabe, J. Kissel, B. Weaver, G. Moreno, C. Vorvick

We've completed the by-hand alignment work needed with the PSL beam, picking up where we left off yesterday (LHO aLOG 39553). That means, we've reconstructed an alignment (using steps 1-11 in LHO aLOG 39547) to get a well-aligned PSL beam from the IMs, centered through SRM and coming out of the OFI well, and then repeated steps 12-14 from LHO aLOG 39553 which where unsuccessful yesterday: 
(12) make sure ZM2 was well aligned by
    (a) inserting the temporary half-wave-plate into the output apeture of the OFI faraday rotator, then
    (b) mechanically adjusting ZM2 to hit the last (most -Y, closest to the future VOPO) iris on HAM6 as shown in Figure 4 of E1500469, then
    (c) sealing in the alignment reference by placing the other iris (most +Y, closest to HAM56 septum) in the beam path and aligning it to the beam.
(13) make sure that SRM is well-aligned by 
    (a) first mechanically adjusting the alignment *some* this morning with the aux laser -- see LHO aLOG 39556, then 
    (b) further mechanically adjusting the alignment the *rest* of the way, using the well-aligned PSL beam, then 
    (c) fiddling with the sliders, until we see fringing patterns at SR2 with the SRY cavity aligned again. Because Betsy is awesome, we see fringing with zero digital alignment bias on SRM. BOSS!!
(14) make sure that PRM is well-aligned by 
    (a) driving it digitially with slider bias,
    (b) looking for fringe fringe patterns at one of the ITMs (we chose to misalign ITMX, and look for fringing on ITMY from the PRY cavity)

(note, chronologically, today, we did steps 14, then 13, then 12).

Attached is a screen shot of OSEMs and sliders once we got SRM aligned, and SRY was flashing. PRM and ITMX are mis-aligned during this screen shot: their slider values should be PRM -995.6 in pitch (yaw should be as shown), and ITMX should be +189.3 in Yaw (pitch should be as shown).

Notes: 
- We're still using only one set of cables to control the OFI, OMs 1-3, or ZMs 1-2, and they all are fed into the CDS system as OM1. We had last used that set of cables to test the OFI (see LHO aLOG 39033). Which means when Betsy and Travis plugged in that set of cables into ZM2 to align and center ZM2's OSEMs this morning, the control system was still configured for an OFI. I've fixed all that, and it's now working as a standard HTTS, and we've confirmed that we can push ZM2 to steer the beam as needed into HAM6, AND, I've confirmed that damping works (though just with a quick look at the MEDM screen). I attach a screen shot of ZM2 functional in the OM1 infrastructure, functionally running as an HTTS.

- As of writing this log, Keita, Sheila, and Gerardo are still out there making the changes to the OM1, OM2, and OM3 alignment, as described in LHO aLOG 39504. I attach some notes about their re-assessment of the plan this evening, which had to be re-measured because LHO aLOG 39504 was thought out before the septum window was rotated.

Great work again today team, and good luck to those still out there!