Sheila, Keita, Elenna, Camilla, Jason, TJ  WP# 12491.

With MC2 misaligned, TJ transitioned to laser hazard and opened the PSL IR light pipe.

Keita checked that the MC REFL path on IOT2L was aligned-ish. We had a beam on the LSC REFL DC and on WFS A. Not much on WFS B. Sheila moved the input PSL PZT to improve pointing onto WFS A.

We were getting flashes on MC2 trans so went to the control room where Sheila zero’ed H1:IMC-WFS gain (was 0.04) and continued to move PSL PZT to maximize MC2 trans flashes (could also see flashes on IM4 trans).

Once these flashes were maximized, Sheila tried to lock with the guardian (which automatically sets gains and thresholds based on input power). Locked but didn’t look great. Sheila and Keita edited the IMC_power_adjust_fuc() of ISC_libary.py so nothing is done when the PSL input power < 1W. IMC then locked great.

During the IMC locking, we had some troubleshooting here as we kept getting “PMC unlocked” notification taking IMC_LOCK to FAULT. Jason explained this could get it getting to the end of its range and while it swaps to the other side of its lock might trigger the notification, even though we could not see it on ndscope. We also had the FSS unlock and the autolocker not able to relook. Jason took PSL FSS common and fast gains to zero, let it settle then brought common and then Fast gains slowly back. This happened a once more where we also had to turn off /on the auto-locker to make it settled.

On IOT2L, everything  (camera and diode) in the IMC trans path was fine, left as is. In the IMC REFL path, the beam was not centered on the high power beam dump (maybe wasn't originally) so we moved IO_MCR_M3. We then checked we were on the plateau of the the LSC diode with IO_MCR_BS1 and checked we weren’t near the edge of the TRIG diode.  We moved the IO_MCR_BD6 beam dump so it was centered on the beam. We moved IO_MCR_BS2 and BS3 to center the beams on WFS A and B.  Sheila moved IO_MCR_M12 up to get MC TRANS on the GiGe camera. Everything on IOT2L is now aligned. 

Checked in-vac and in-air powers are correct-ish by comparing them to 2W IMC locked/ unlocked. Sheila and Elenna locked IMC with WFS centering servos back on and offloaded the WFS. 

As Ibrahim checked yesterday 84153, the IMs are a little different but Elenna checked the beam centering on IM4 trans is close to when we were locked: P was 0.24 now 0.2, Yaw was -0.08 now -0.13. 

Keita restored SR2, SR3, BS, ITMX to a time 31 days ago when IFO was locked and could see the beam on the AS AIR camera. 

We have left the IMC offline and PSL IR light pipe closed.