TVo, Sheila, Terra
In prep for HAM6 work tomorrow (for which we'll need single bounce X and Y), we relocked IMC without a problem and then aligned single bounce(s) onto AS_C. We should be set for tomorrow.
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We started by trying slider values from here. Once we had some light on AS_C, we found that
- with ITMX misaligned, switching between ITMY aligned/misaligned gave no change on AS_C
- ITMX misaligned gave more power on AS_C than ITMX aligned
This looked like things were aligned to the misaligned ITMX state, so we stepped down the ITMX M0 test offsets while compensating with PR2, effectively aligning to the ITMX aligned state. At this point we had flashing power at AS_C; turned out to be flashing MICH since ITMY misaligned state was not misaligned enough. We then increased the M0 offsets in the respective misaligned state until there was no light on AS_C. In short, offsets nominal and those we found for full misalignment in single bounce are:
| ITMX nominal | ITMX MICH | ITMY nominal | ITMY MICH | |
| Pitch | 50 | 200 | 50 | 600 |
| Yaw | -80 | -200 | 600 | -400 |
Final alignment values here. Note we did not change ITMX, BS, PR3 slider values.
We spent a bit of time trying to align REFL; we could get some power onto REFL_B, but not _A before we decided to move on.
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Side note: we tried to go to PRX_LOCKED in IFO_ALIGN but there was a user code error thrown. We tried poking around but seems like the error is deeper in the set_sus_config function. Since we didn't really need guardian tonight or tomorrow, we're leaving it for later. There was some recent work done on this node, as mentioned here.
Re: the guardian error, it just looks like the SRM node wasn't managed, and so INIT in the ALIGN_IFO node needed to be run. I don't want to test to confirm this right now, however, since HAM6 alignment work is beginning. I'll try to test it when they come out for lunch break, or something.