[Basically everyone in the control room]
We spent a lot of time working on pre-initial alignment, since we weren't seeing any light at the ALS transmission cameras or PDs.
All of the test mass optics and PR3 were restored to where their oplevs thought they were before the power outage (since the oplevs are independent of ISI pointing). The TMS suspensions were aligned using the baffle PD script.
Eventually, it was discovered that a shutter on ISCT1 was closed, and blocking the transmitted green beams.
Keita and Daniel are looking into why it was closed at all when the power went out and why it wasn't opened after the burt restore that Patrick did, but I have also added it to the ISC_LOCK DOWN state, so that we don't get bitten by this again.
We're getting good flashing in the arm cavities, both for green and IR, so as soon as this earthquake finishes ringing down, we can do initial alignment and finally relock.
[Jenne, TJ]
After finishing the green initial alignment step, we noticed that the COMM beatnote power was tiny - something like -32dBm. No good. After trying some PR3 alignment with no effect, we looked at some more shutters. As it turns out, the PSL green beam also has a shutter, so we weren't getting any PSL green to the beat PD. Opening that immediately fixed the problem. TJ finished off hand-aligning PR3 to maximize the beatnote power, and we went off to our next initial alignment step. (See aLog 22705 for that "fun"....)
This shutter was also added to the ISC_LOCK down state, so we don't get bitten by it either.